1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2000-2019 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 #define IN_TARGET_CODE 1
25 #include "coretypes.h"
30 #include "stringpool.h"
35 #include "insn-config.h"
40 #include "diagnostic-core.h"
43 #include "stor-layout.h"
48 #include "tm-constrs.h"
51 /* This file should be included last. */
52 #include "target-def.h"
54 /* First some local helper definitions. */
55 #define MMIX_FIRST_GLOBAL_REGNUM 32
57 /* We'd need a current_function_has_landing_pad. It's marked as such when
58 a nonlocal_goto_receiver is expanded. Not just a C++ thing, but
60 #define MMIX_CFUN_HAS_LANDING_PAD (cfun->machine->has_landing_pad != 0)
62 /* We have no means to tell DWARF 2 about the register stack, so we need
63 to store the return address on the stack if an exception can get into
64 this function. We'll have an "initial value" recorded for the
65 return-register if we've seen a call instruction emitted. This note
66 will be inaccurate before instructions are emitted, but the only caller
67 at that time is looking for modulo from stack-boundary, to which the
68 return-address does not contribute, and which is always 0 for MMIX
69 anyway. Beware of calling leaf_function_p here, as it'll abort if
70 called within a sequence. */
71 #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \
73 && has_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM))
75 #define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \
76 (crtl->calls_eh_return \
77 && (EH_RETURN_DATA_REGNO (0) == REGNO \
78 || EH_RETURN_DATA_REGNO (1) == REGNO \
79 || EH_RETURN_DATA_REGNO (2) == REGNO \
80 || EH_RETURN_DATA_REGNO (3) == REGNO))
82 /* For the default ABI, we rename registers at output-time to fill the gap
83 between the (statically partitioned) saved registers and call-clobbered
84 registers. In effect this makes unused call-saved registers to be used
85 as call-clobbered registers. The benefit comes from keeping the number
86 of local registers (value of rL) low, since there's a cost of
87 increasing rL and clearing unused (unset) registers with lower numbers.
88 Don't translate while outputting the prologue. */
89 #define MMIX_OUTPUT_REGNO(N) \
91 || (int) (N) < MMIX_RETURN_VALUE_REGNUM \
92 || (int) (N) > MMIX_LAST_STACK_REGISTER_REGNUM \
94 || cfun->machine == NULL \
95 || cfun->machine->in_prologue \
96 ? (N) : ((N) - MMIX_RETURN_VALUE_REGNUM \
97 + cfun->machine->highest_saved_stack_register + 1))
99 /* The %d in "POP %d,0". */
100 #define MMIX_POP_ARGUMENT() \
102 && crtl->return_rtx != NULL \
103 && ! cfun->returns_struct) \
104 ? (GET_CODE (crtl->return_rtx) == PARALLEL \
105 ? GET_NUM_ELEM (XVEC (crtl->return_rtx, 0)) : 1) \
108 /* The canonical saved comparison operands for non-cc0 machines, set in
109 the compare expander. */
110 rtx mmix_compare_op0
;
111 rtx mmix_compare_op1
;
113 /* Declarations of locals. */
115 /* Intermediate for insn output. */
116 static int mmix_output_destination_register
;
118 static void mmix_option_override (void);
119 static void mmix_asm_output_source_filename (FILE *, const char *);
120 static void mmix_output_shiftvalue_op_from_str
121 (FILE *, const char *, int64_t);
122 static void mmix_output_shifted_value (FILE *, int64_t);
123 static void mmix_output_condition (FILE *, const_rtx
, int);
124 static void mmix_output_octa (FILE *, int64_t, int);
125 static bool mmix_assemble_integer (rtx
, unsigned int, int);
126 static struct machine_function
*mmix_init_machine_status (void);
127 static void mmix_encode_section_info (tree
, rtx
, int);
128 static const char *mmix_strip_name_encoding (const char *);
129 static void mmix_emit_sp_add (HOST_WIDE_INT offset
);
130 static void mmix_target_asm_function_prologue (FILE *);
131 static void mmix_target_asm_function_end_prologue (FILE *);
132 static void mmix_target_asm_function_epilogue (FILE *);
133 static reg_class_t
mmix_preferred_reload_class (rtx
, reg_class_t
);
134 static reg_class_t
mmix_preferred_output_reload_class (rtx
, reg_class_t
);
135 static bool mmix_legitimate_address_p (machine_mode
, rtx
, bool);
136 static bool mmix_legitimate_constant_p (machine_mode
, rtx
);
137 static void mmix_reorg (void);
138 static void mmix_asm_output_mi_thunk
139 (FILE *, tree
, HOST_WIDE_INT
, HOST_WIDE_INT
, tree
);
140 static void mmix_setup_incoming_varargs
141 (cumulative_args_t
, const function_arg_info
&, int *, int);
142 static void mmix_file_start (void);
143 static void mmix_file_end (void);
144 static void mmix_init_libfuncs (void);
145 static bool mmix_rtx_costs (rtx
, machine_mode
, int, int, int *, bool);
146 static int mmix_register_move_cost (machine_mode
,
147 reg_class_t
, reg_class_t
);
148 static rtx
mmix_struct_value_rtx (tree
, int);
149 static machine_mode
mmix_promote_function_mode (const_tree
,
151 int *, const_tree
, int);
152 static void mmix_function_arg_advance (cumulative_args_t
,
153 const function_arg_info
&);
154 static rtx
mmix_function_incoming_arg (cumulative_args_t
,
155 const function_arg_info
&);
156 static rtx
mmix_function_arg (cumulative_args_t
, const function_arg_info
&);
157 static rtx
mmix_function_value (const_tree
, const_tree
, bool);
158 static rtx
mmix_libcall_value (machine_mode
, const_rtx
);
159 static bool mmix_function_value_regno_p (const unsigned int);
160 static bool mmix_pass_by_reference (cumulative_args_t
,
161 const function_arg_info
&);
162 static bool mmix_frame_pointer_required (void);
163 static void mmix_asm_trampoline_template (FILE *);
164 static void mmix_trampoline_init (rtx
, tree
, rtx
);
165 static void mmix_print_operand (FILE *, rtx
, int);
166 static void mmix_print_operand_address (FILE *, machine_mode
, rtx
);
167 static bool mmix_print_operand_punct_valid_p (unsigned char);
168 static void mmix_conditional_register_usage (void);
169 static HOST_WIDE_INT
mmix_static_rtx_alignment (machine_mode
);
170 static HOST_WIDE_INT
mmix_constant_alignment (const_tree
, HOST_WIDE_INT
);
171 static HOST_WIDE_INT
mmix_starting_frame_offset (void);
173 /* Target structure macros. Listed by node. See `Using and Porting GCC'
174 for a general description. */
176 /* Node: Function Entry */
178 #undef TARGET_ASM_BYTE_OP
179 #define TARGET_ASM_BYTE_OP NULL
180 #undef TARGET_ASM_ALIGNED_HI_OP
181 #define TARGET_ASM_ALIGNED_HI_OP NULL
182 #undef TARGET_ASM_ALIGNED_SI_OP
183 #define TARGET_ASM_ALIGNED_SI_OP NULL
184 #undef TARGET_ASM_ALIGNED_DI_OP
185 #define TARGET_ASM_ALIGNED_DI_OP NULL
186 #undef TARGET_ASM_INTEGER
187 #define TARGET_ASM_INTEGER mmix_assemble_integer
189 #undef TARGET_ASM_FUNCTION_PROLOGUE
190 #define TARGET_ASM_FUNCTION_PROLOGUE mmix_target_asm_function_prologue
192 #undef TARGET_ASM_FUNCTION_END_PROLOGUE
193 #define TARGET_ASM_FUNCTION_END_PROLOGUE mmix_target_asm_function_end_prologue
195 #undef TARGET_ASM_FUNCTION_EPILOGUE
196 #define TARGET_ASM_FUNCTION_EPILOGUE mmix_target_asm_function_epilogue
198 #undef TARGET_PRINT_OPERAND
199 #define TARGET_PRINT_OPERAND mmix_print_operand
200 #undef TARGET_PRINT_OPERAND_ADDRESS
201 #define TARGET_PRINT_OPERAND_ADDRESS mmix_print_operand_address
202 #undef TARGET_PRINT_OPERAND_PUNCT_VALID_P
203 #define TARGET_PRINT_OPERAND_PUNCT_VALID_P mmix_print_operand_punct_valid_p
205 #undef TARGET_ENCODE_SECTION_INFO
206 #define TARGET_ENCODE_SECTION_INFO mmix_encode_section_info
207 #undef TARGET_STRIP_NAME_ENCODING
208 #define TARGET_STRIP_NAME_ENCODING mmix_strip_name_encoding
210 #undef TARGET_ASM_OUTPUT_MI_THUNK
211 #define TARGET_ASM_OUTPUT_MI_THUNK mmix_asm_output_mi_thunk
212 #undef TARGET_ASM_CAN_OUTPUT_MI_THUNK
213 #define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall
214 #undef TARGET_ASM_FILE_START
215 #define TARGET_ASM_FILE_START mmix_file_start
216 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
217 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
218 #undef TARGET_ASM_FILE_END
219 #define TARGET_ASM_FILE_END mmix_file_end
220 #undef TARGET_ASM_OUTPUT_SOURCE_FILENAME
221 #define TARGET_ASM_OUTPUT_SOURCE_FILENAME mmix_asm_output_source_filename
223 #undef TARGET_INIT_LIBFUNCS
224 #define TARGET_INIT_LIBFUNCS mmix_init_libfuncs
226 #undef TARGET_CONDITIONAL_REGISTER_USAGE
227 #define TARGET_CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage
229 #undef TARGET_HAVE_SPECULATION_SAFE_VALUE
230 #define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed
232 #undef TARGET_RTX_COSTS
233 #define TARGET_RTX_COSTS mmix_rtx_costs
234 #undef TARGET_ADDRESS_COST
235 #define TARGET_ADDRESS_COST hook_int_rtx_mode_as_bool_0
237 #undef TARGET_REGISTER_MOVE_COST
238 #define TARGET_REGISTER_MOVE_COST mmix_register_move_cost
240 #undef TARGET_MACHINE_DEPENDENT_REORG
241 #define TARGET_MACHINE_DEPENDENT_REORG mmix_reorg
243 #undef TARGET_PROMOTE_FUNCTION_MODE
244 #define TARGET_PROMOTE_FUNCTION_MODE mmix_promote_function_mode
246 #undef TARGET_FUNCTION_VALUE
247 #define TARGET_FUNCTION_VALUE mmix_function_value
248 #undef TARGET_LIBCALL_VALUE
249 #define TARGET_LIBCALL_VALUE mmix_libcall_value
250 #undef TARGET_FUNCTION_VALUE_REGNO_P
251 #define TARGET_FUNCTION_VALUE_REGNO_P mmix_function_value_regno_p
253 #undef TARGET_FUNCTION_ARG
254 #define TARGET_FUNCTION_ARG mmix_function_arg
255 #undef TARGET_FUNCTION_INCOMING_ARG
256 #define TARGET_FUNCTION_INCOMING_ARG mmix_function_incoming_arg
257 #undef TARGET_FUNCTION_ARG_ADVANCE
258 #define TARGET_FUNCTION_ARG_ADVANCE mmix_function_arg_advance
259 #undef TARGET_STRUCT_VALUE_RTX
260 #define TARGET_STRUCT_VALUE_RTX mmix_struct_value_rtx
261 #undef TARGET_SETUP_INCOMING_VARARGS
262 #define TARGET_SETUP_INCOMING_VARARGS mmix_setup_incoming_varargs
263 #undef TARGET_PASS_BY_REFERENCE
264 #define TARGET_PASS_BY_REFERENCE mmix_pass_by_reference
265 #undef TARGET_CALLEE_COPIES
266 #define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_arg_info_true
268 #undef TARGET_PREFERRED_RELOAD_CLASS
269 #define TARGET_PREFERRED_RELOAD_CLASS mmix_preferred_reload_class
270 #undef TARGET_PREFERRED_OUTPUT_RELOAD_CLASS
271 #define TARGET_PREFERRED_OUTPUT_RELOAD_CLASS mmix_preferred_output_reload_class
274 #define TARGET_LRA_P hook_bool_void_false
276 #undef TARGET_LEGITIMATE_ADDRESS_P
277 #define TARGET_LEGITIMATE_ADDRESS_P mmix_legitimate_address_p
278 #undef TARGET_LEGITIMATE_CONSTANT_P
279 #define TARGET_LEGITIMATE_CONSTANT_P mmix_legitimate_constant_p
281 #undef TARGET_FRAME_POINTER_REQUIRED
282 #define TARGET_FRAME_POINTER_REQUIRED mmix_frame_pointer_required
284 #undef TARGET_ASM_TRAMPOLINE_TEMPLATE
285 #define TARGET_ASM_TRAMPOLINE_TEMPLATE mmix_asm_trampoline_template
286 #undef TARGET_TRAMPOLINE_INIT
287 #define TARGET_TRAMPOLINE_INIT mmix_trampoline_init
289 #undef TARGET_OPTION_OVERRIDE
290 #define TARGET_OPTION_OVERRIDE mmix_option_override
292 #undef TARGET_STATIC_RTX_ALIGNMENT
293 #define TARGET_STATIC_RTX_ALIGNMENT mmix_static_rtx_alignment
294 #undef TARGET_CONSTANT_ALIGNMENT
295 #define TARGET_CONSTANT_ALIGNMENT mmix_constant_alignment
297 #undef TARGET_STARTING_FRAME_OFFSET
298 #define TARGET_STARTING_FRAME_OFFSET mmix_starting_frame_offset
300 struct gcc_target targetm
= TARGET_INITIALIZER
;
302 /* Functions that are expansions for target macros.
303 See Target Macros in `Using and Porting GCC'. */
305 /* TARGET_OPTION_OVERRIDE. */
308 mmix_option_override (void)
310 /* Should we err or should we warn? Hmm. At least we must neutralize
311 it. For example the wrong kind of case-tables will be generated with
312 PIC; we use absolute address items for mmixal compatibility. FIXME:
313 They could be relative if we just elide them to after all pertinent
317 warning (0, "%<-f%s%> not supported: ignored",
318 (flag_pic
> 1) ? "PIC" : "pic");
323 /* INIT_EXPANDERS. */
326 mmix_init_expanders (void)
328 init_machine_status
= mmix_init_machine_status
;
331 /* Set the per-function data. */
333 static struct machine_function
*
334 mmix_init_machine_status (void)
336 return ggc_cleared_alloc
<machine_function
> ();
339 /* DATA_ABI_ALIGNMENT.
340 We have trouble getting the address of stuff that is located at other
341 than 32-bit alignments (GETA requirements), so try to give everything
342 at least 32-bit alignment. */
345 mmix_data_alignment (tree type ATTRIBUTE_UNUSED
, int basic_align
)
347 if (basic_align
< 32)
353 /* Implement TARGET_STATIC_RTX_ALIGNMENT. */
356 mmix_static_rtx_alignment (machine_mode mode
)
358 return MAX (GET_MODE_ALIGNMENT (mode
), 32);
361 /* Implement tARGET_CONSTANT_ALIGNMENT. */
364 mmix_constant_alignment (const_tree
, HOST_WIDE_INT basic_align
)
366 if (basic_align
< 32)
372 /* LOCAL_ALIGNMENT. */
375 mmix_local_alignment (tree type ATTRIBUTE_UNUSED
, unsigned basic_align
)
377 if (basic_align
< 32)
383 /* TARGET_CONDITIONAL_REGISTER_USAGE. */
386 mmix_conditional_register_usage (void)
392 static const int gnu_abi_reg_alloc_order
[]
393 = MMIX_GNU_ABI_REG_ALLOC_ORDER
;
395 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
396 reg_alloc_order
[i
] = gnu_abi_reg_alloc_order
[i
];
398 /* Change the default from the mmixware ABI. For the GNU ABI,
399 $15..$30 are call-saved just as $0..$14. There must be one
400 call-clobbered local register for the "hole" that holds the
401 number of saved local registers saved by PUSHJ/PUSHGO during the
402 function call, receiving the return value at return. So best is
403 to use the highest, $31. It's already marked call-clobbered for
405 for (i
= 15; i
<= 30; i
++)
406 call_used_regs
[i
] = 0;
408 /* "Unfix" the parameter registers. */
409 for (i
= MMIX_RESERVED_GNU_ARG_0_REGNUM
;
410 i
< MMIX_RESERVED_GNU_ARG_0_REGNUM
+ MMIX_MAX_ARGS_IN_REGS
;
415 /* Step over the ":" in special register names. */
416 if (! TARGET_TOPLEVEL_SYMBOLS
)
417 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
418 if (reg_names
[i
][0] == ':')
422 /* INCOMING_REGNO and OUTGOING_REGNO worker function.
423 Those two macros must only be applied to function argument
424 registers and the function return value register for the opposite
425 use. FIXME: for their current use in gcc, it'd be better with an
426 explicit specific additional FUNCTION_INCOMING_ARG_REGNO_P a'la
427 TARGET_FUNCTION_ARG / TARGET_FUNCTION_INCOMING_ARG instead of
428 forcing the target to commit to a fixed mapping and for any
429 unspecified register use. Particularly when thinking about the
430 return-value, it is better to imagine INCOMING_REGNO and
431 OUTGOING_REGNO as named CALLEE_TO_CALLER_REGNO and INNER_REGNO as
432 named CALLER_TO_CALLEE_REGNO because the direction. The "incoming"
433 and "outgoing" is from the perspective of the parameter-registers,
434 but the same macro is (must be, lacking an alternative like
435 suggested above) used to map the return-value-register from the
436 same perspective. To make directions even more confusing, the macro
437 MMIX_OUTGOING_RETURN_VALUE_REGNUM holds the number of the register
438 in which to return a value, i.e. INCOMING_REGNO for the return-value-
439 register as received from a called function; the return-value on the
443 mmix_opposite_regno (int regno
, int incoming
)
445 if (incoming
&& regno
== MMIX_OUTGOING_RETURN_VALUE_REGNUM
)
446 return MMIX_RETURN_VALUE_REGNUM
;
448 if (!incoming
&& regno
== MMIX_RETURN_VALUE_REGNUM
)
449 return MMIX_OUTGOING_RETURN_VALUE_REGNUM
;
451 if (!mmix_function_arg_regno_p (regno
, incoming
))
456 ? MMIX_FIRST_INCOMING_ARG_REGNUM
- MMIX_FIRST_ARG_REGNUM
457 : MMIX_FIRST_ARG_REGNUM
- MMIX_FIRST_INCOMING_ARG_REGNUM
);
461 All registers that are part of the register stack and that will be
465 mmix_local_regno (int regno
)
467 return (regno
<= MMIX_LAST_STACK_REGISTER_REGNUM
468 && !call_used_or_fixed_reg_p (regno
));
471 /* TARGET_PREFERRED_RELOAD_CLASS.
472 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */
475 mmix_preferred_reload_class (rtx x
, reg_class_t rclass
)
477 /* FIXME: Revisit. */
478 return GET_CODE (x
) == MOD
&& GET_MODE (x
) == DImode
479 ? REMAINDER_REG
: rclass
;
482 /* TARGET_PREFERRED_OUTPUT_RELOAD_CLASS.
483 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */
486 mmix_preferred_output_reload_class (rtx x
, reg_class_t rclass
)
488 /* FIXME: Revisit. */
489 return GET_CODE (x
) == MOD
&& GET_MODE (x
) == DImode
490 ? REMAINDER_REG
: rclass
;
493 /* SECONDARY_RELOAD_CLASS.
494 We need to reload regs of REMAINDER_REG and HIMULT_REG elsewhere. */
497 mmix_secondary_reload_class (enum reg_class rclass
,
498 machine_mode mode ATTRIBUTE_UNUSED
,
499 rtx x ATTRIBUTE_UNUSED
,
500 int in_p ATTRIBUTE_UNUSED
)
502 if (rclass
== REMAINDER_REG
503 || rclass
== HIMULT_REG
504 || rclass
== SYSTEM_REGS
)
510 /* DYNAMIC_CHAIN_ADDRESS. */
513 mmix_dynamic_chain_address (rtx frame
)
515 /* FIXME: the frame-pointer is stored at offset -8 from the current
516 frame-pointer. Unfortunately, the caller assumes that a
517 frame-pointer is present for *all* previous frames. There should be
518 a way to say that that cannot be done, like for RETURN_ADDR_RTX. */
519 return plus_constant (Pmode
, frame
, -8);
522 /* Implement TARGET_STARTING_FRAME_OFFSET. */
525 mmix_starting_frame_offset (void)
527 /* The old frame pointer is in the slot below the new one, so
528 FIRST_PARM_OFFSET does not need to depend on whether the
529 frame-pointer is needed or not. We have to adjust for the register
530 stack pointer being located below the saved frame pointer.
531 Similarly, we store the return address on the stack too, for
532 exception handling, and always if we save the register stack pointer. */
535 + (MMIX_CFUN_HAS_LANDING_PAD
536 ? -16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
? -8 : 0)));
539 /* RETURN_ADDR_RTX. */
542 mmix_return_addr_rtx (int count
, rtx frame ATTRIBUTE_UNUSED
)
545 ? (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
546 /* FIXME: Set frame_alias_set on the following. (Why?)
547 See mmix_initial_elimination_offset for the reason we can't use
548 get_hard_reg_initial_val for both. Always using a stack slot
549 and not a register would be suboptimal. */
550 ? validize_mem (gen_rtx_MEM (Pmode
,
551 plus_constant (Pmode
,
552 frame_pointer_rtx
, -16)))
553 : get_hard_reg_initial_val (Pmode
, MMIX_INCOMING_RETURN_ADDRESS_REGNUM
))
557 /* SETUP_FRAME_ADDRESSES. */
560 mmix_setup_frame_addresses (void)
562 /* Nothing needed at the moment. */
565 /* The difference between the (imaginary) frame pointer and the stack
566 pointer. Used to eliminate the frame pointer. */
569 mmix_initial_elimination_offset (int fromreg
, int toreg
)
573 = (get_frame_size () + crtl
->outgoing_args_size
+ 7) & ~7;
575 /* There is no actual offset between these two virtual values, but for
576 the frame-pointer, we have the old one in the stack position below
577 it, so the offset for the frame-pointer to the stack-pointer is one
579 if (fromreg
== MMIX_ARG_POINTER_REGNUM
580 && toreg
== MMIX_FRAME_POINTER_REGNUM
)
583 /* The difference is the size of local variables plus the size of
584 outgoing function arguments that would normally be passed as
585 registers but must be passed on stack because we're out of
586 function-argument registers. Only global saved registers are
587 counted; the others go on the register stack.
589 The frame-pointer is counted too if it is what is eliminated, as we
590 need to balance the offset for it from TARGET_STARTING_FRAME_OFFSET.
592 Also add in the slot for the register stack pointer we save if we
595 Unfortunately, we can't access $0..$14, from unwinder code easily, so
596 store the return address in a frame slot too. FIXME: Only for
597 non-leaf functions. FIXME: Always with a landing pad, because it's
598 hard to know whether we need the other at the time we know we need
599 the offset for one (and have to state it). It's a kludge until we
600 can express the register stack in the EH frame info.
602 We have to do alignment here; get_frame_size will not return a
603 multiple of STACK_BOUNDARY. FIXME: Add note in manual. */
605 for (regno
= MMIX_FIRST_GLOBAL_REGNUM
;
608 if ((df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
))
609 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
613 + (MMIX_CFUN_HAS_LANDING_PAD
614 ? 16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
? 8 : 0))
615 + (fromreg
== MMIX_ARG_POINTER_REGNUM
? 0 : 8);
619 mmix_function_arg_advance (cumulative_args_t argsp_v
,
620 const function_arg_info
&arg
)
622 CUMULATIVE_ARGS
*argsp
= get_cumulative_args (argsp_v
);
623 int arg_size
= MMIX_FUNCTION_ARG_SIZE (arg
.mode
, arg
.type
);
625 argsp
->regs
= ((targetm
.calls
.must_pass_in_stack (arg
)
629 ? (MMIX_MAX_ARGS_IN_REGS
) + 1
630 : argsp
->regs
+ (7 + arg_size
) / 8);
633 /* Helper function for mmix_function_arg and mmix_function_incoming_arg. */
636 mmix_function_arg_1 (const cumulative_args_t argsp_v
,
637 const function_arg_info
&arg
, bool incoming
)
639 CUMULATIVE_ARGS
*argsp
= get_cumulative_args (argsp_v
);
641 /* Last-argument marker. */
642 if (arg
.end_marker_p ())
643 return (argsp
->regs
< MMIX_MAX_ARGS_IN_REGS
)
644 ? gen_rtx_REG (arg
.mode
,
646 ? MMIX_FIRST_INCOMING_ARG_REGNUM
647 : MMIX_FIRST_ARG_REGNUM
) + argsp
->regs
)
650 return (argsp
->regs
< MMIX_MAX_ARGS_IN_REGS
651 && !targetm
.calls
.must_pass_in_stack (arg
)
652 && (GET_MODE_BITSIZE (arg
.mode
) <= 64
655 ? gen_rtx_REG (arg
.mode
,
657 ? MMIX_FIRST_INCOMING_ARG_REGNUM
658 : MMIX_FIRST_ARG_REGNUM
)
663 /* Return an rtx for a function argument to go in a register, and 0 for
664 one that must go on stack. */
667 mmix_function_arg (cumulative_args_t argsp
, const function_arg_info
&arg
)
669 return mmix_function_arg_1 (argsp
, arg
, false);
673 mmix_function_incoming_arg (cumulative_args_t argsp
,
674 const function_arg_info
&arg
)
676 return mmix_function_arg_1 (argsp
, arg
, true);
679 /* Returns nonzero for everything that goes by reference, 0 for
680 everything that goes by value. */
683 mmix_pass_by_reference (cumulative_args_t argsp_v
,
684 const function_arg_info
&arg
)
686 CUMULATIVE_ARGS
*argsp
= get_cumulative_args (argsp_v
);
688 /* FIXME: Check: I'm not sure the must_pass_in_stack check is
690 if (targetm
.calls
.must_pass_in_stack (arg
))
693 if (MMIX_FUNCTION_ARG_SIZE (arg
.mode
, arg
.type
) > 8
695 && (!argsp
|| !argsp
->lib
))
701 /* Return nonzero if regno is a register number where a parameter is
702 passed, and 0 otherwise. */
705 mmix_function_arg_regno_p (int regno
, int incoming
)
708 = incoming
? MMIX_FIRST_INCOMING_ARG_REGNUM
: MMIX_FIRST_ARG_REGNUM
;
710 return regno
>= first_arg_regnum
711 && regno
< first_arg_regnum
+ MMIX_MAX_ARGS_IN_REGS
;
714 /* Implements TARGET_FUNCTION_VALUE. */
717 mmix_function_value (const_tree valtype
,
718 const_tree func ATTRIBUTE_UNUSED
,
721 machine_mode mode
= TYPE_MODE (valtype
);
723 int first_val_regnum
= MMIX_OUTGOING_RETURN_VALUE_REGNUM
;
724 rtx vec
[MMIX_MAX_REGS_FOR_VALUE
];
729 return gen_rtx_REG (mode
, MMIX_RETURN_VALUE_REGNUM
);
731 /* Return values that fit in a register need no special handling.
732 There's no register hole when parameters are passed in global
735 || GET_MODE_BITSIZE (mode
) <= BITS_PER_WORD
)
737 gen_rtx_REG (mode
, MMIX_OUTGOING_RETURN_VALUE_REGNUM
);
739 if (COMPLEX_MODE_P (mode
))
740 /* A complex type, made up of components. */
741 cmode
= TYPE_MODE (TREE_TYPE (valtype
));
744 /* Of the other larger-than-register modes, we only support
745 scalar mode TImode. (At least, that's the only one that's
746 been rudimentally tested.) Make sure we're alerted for
749 sorry ("support for mode %qs", GET_MODE_NAME (mode
));
751 /* In any case, we will fill registers to the natural size. */
755 nregs
= ((GET_MODE_BITSIZE (mode
) + BITS_PER_WORD
- 1) / BITS_PER_WORD
);
757 /* We need to take care of the effect of the register hole on return
758 values of large sizes; the last register will appear as the first
759 register, with the rest shifted. (For complex modes, this is just
760 swapped registers.) */
762 if (nregs
> MMIX_MAX_REGS_FOR_VALUE
)
763 internal_error ("too large function value type, needs %d registers,\
764 have only %d registers for this", nregs
, MMIX_MAX_REGS_FOR_VALUE
);
766 /* FIXME: Maybe we should handle structure values like this too
767 (adjusted for BLKmode), perhaps for both ABI:s. */
768 for (i
= 0; i
< nregs
- 1; i
++)
770 = gen_rtx_EXPR_LIST (VOIDmode
,
771 gen_rtx_REG (cmode
, first_val_regnum
+ i
),
772 GEN_INT ((i
+ 1) * BITS_PER_UNIT
));
775 = gen_rtx_EXPR_LIST (VOIDmode
,
776 gen_rtx_REG (cmode
, first_val_regnum
+ nregs
- 1),
779 return gen_rtx_PARALLEL (mode
, gen_rtvec_v (nregs
, vec
));
782 /* Implements TARGET_LIBCALL_VALUE. */
785 mmix_libcall_value (machine_mode mode
,
786 const_rtx fun ATTRIBUTE_UNUSED
)
788 return gen_rtx_REG (mode
, MMIX_RETURN_VALUE_REGNUM
);
791 /* Implements TARGET_FUNCTION_VALUE_REGNO_P. */
794 mmix_function_value_regno_p (const unsigned int regno
)
796 return regno
== MMIX_RETURN_VALUE_REGNUM
;
799 /* EH_RETURN_DATA_REGNO. */
802 mmix_eh_return_data_regno (int n
)
805 return MMIX_EH_RETURN_DATA_REGNO_START
+ n
;
807 return INVALID_REGNUM
;
810 /* EH_RETURN_STACKADJ_RTX. */
813 mmix_eh_return_stackadj_rtx (void)
815 return gen_rtx_REG (Pmode
, MMIX_EH_RETURN_STACKADJ_REGNUM
);
818 /* EH_RETURN_HANDLER_RTX. */
821 mmix_eh_return_handler_rtx (void)
823 return gen_rtx_REG (Pmode
, MMIX_INCOMING_RETURN_ADDRESS_REGNUM
);
826 /* ASM_PREFERRED_EH_DATA_FORMAT. */
829 mmix_asm_preferred_eh_data_format (int code ATTRIBUTE_UNUSED
,
830 int global ATTRIBUTE_UNUSED
)
832 /* This is the default (was at 2001-07-20). Revisit when needed. */
833 return DW_EH_PE_absptr
;
836 /* Make a note that we've seen the beginning of the prologue. This
837 matters to whether we'll translate register numbers as calculated by
841 mmix_target_asm_function_prologue (FILE *)
843 cfun
->machine
->in_prologue
= 1;
846 /* Make a note that we've seen the end of the prologue. */
849 mmix_target_asm_function_end_prologue (FILE *stream ATTRIBUTE_UNUSED
)
851 cfun
->machine
->in_prologue
= 0;
854 /* Implement TARGET_MACHINE_DEPENDENT_REORG. No actual rearrangements
855 done here; just virtually by calculating the highest saved stack
856 register number used to modify the register numbers at output time. */
863 /* We put the number of the highest saved register-file register in a
864 location convenient for the call-patterns to output. Note that we
865 don't tell dwarf2 about these registers, since it can't restore them
867 for (regno
= MMIX_LAST_STACK_REGISTER_REGNUM
;
870 if ((df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
))
871 || (regno
== MMIX_FRAME_POINTER_REGNUM
&& frame_pointer_needed
))
874 /* Regardless of whether they're saved (they might be just read), we
875 mustn't include registers that carry parameters. We could scan the
876 insns to see whether they're actually used (and indeed do other less
877 trivial register usage analysis and transformations), but it seems
878 wasteful to optimize for unused parameter registers. As of
879 2002-04-30, df_regs_ever_live_p (n) seems to be set for only-reads too, but
880 that might change. */
881 if (!TARGET_ABI_GNU
&& regno
< crtl
->args
.info
.regs
- 1)
883 regno
= crtl
->args
.info
.regs
- 1;
885 /* We don't want to let this cause us to go over the limit and make
886 incoming parameter registers be misnumbered and treating the last
887 parameter register and incoming return value register call-saved.
888 Stop things at the unmodified scheme. */
889 if (regno
> MMIX_RETURN_VALUE_REGNUM
- 1)
890 regno
= MMIX_RETURN_VALUE_REGNUM
- 1;
893 cfun
->machine
->highest_saved_stack_register
= regno
;
896 /* TARGET_ASM_FUNCTION_EPILOGUE. */
899 mmix_target_asm_function_epilogue (FILE *stream
)
901 /* Emit an \n for readability of the generated assembly. */
902 fputc ('\n', stream
);
905 /* TARGET_ASM_OUTPUT_MI_THUNK. */
908 mmix_asm_output_mi_thunk (FILE *stream
,
909 tree thunk_fndecl ATTRIBUTE_UNUSED
,
911 HOST_WIDE_INT vcall_offset ATTRIBUTE_UNUSED
,
914 /* If you define TARGET_STRUCT_VALUE_RTX that returns 0 (i.e. pass
915 location of structure to return as invisible first argument), you
916 need to tweak this code too. */
917 const char *regname
= reg_names
[MMIX_FIRST_INCOMING_ARG_REGNUM
];
918 const char *fnname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk_fndecl
));
920 assemble_start_function (thunk_fndecl
, fnname
);
922 if (delta
>= 0 && delta
< 65536)
923 fprintf (stream
, "\tINCL %s,%d\n", regname
, (int)delta
);
924 else if (delta
< 0 && delta
>= -255)
925 fprintf (stream
, "\tSUBU %s,%s,%d\n", regname
, regname
, (int)-delta
);
928 mmix_output_register_setting (stream
, 255, delta
, 1);
929 fprintf (stream
, "\tADDU %s,%s,$255\n", regname
, regname
);
932 fprintf (stream
, "\tJMP ");
933 assemble_name (stream
, XSTR (XEXP (DECL_RTL (func
), 0), 0));
934 fprintf (stream
, "\n");
935 assemble_end_function (thunk_fndecl
, fnname
);
938 /* FUNCTION_PROFILER. */
941 mmix_function_profiler (FILE *stream ATTRIBUTE_UNUSED
,
942 int labelno ATTRIBUTE_UNUSED
)
944 sorry ("function_profiler support for MMIX");
947 /* Worker function for TARGET_SETUP_INCOMING_VARARGS. For the moment,
948 let's stick to pushing argument registers on the stack. Later, we
949 can parse all arguments in registers, to improve performance. */
952 mmix_setup_incoming_varargs (cumulative_args_t args_so_farp_v
,
953 const function_arg_info
&arg
,
955 int second_time ATTRIBUTE_UNUSED
)
957 CUMULATIVE_ARGS
*args_so_farp
= get_cumulative_args (args_so_farp_v
);
959 /* The last named variable has been handled, but
960 args_so_farp has not been advanced for it. */
961 if (args_so_farp
->regs
+ 1 < MMIX_MAX_ARGS_IN_REGS
)
962 *pretend_sizep
= (MMIX_MAX_ARGS_IN_REGS
- (args_so_farp
->regs
+ 1)) * 8;
964 /* We assume that one argument takes up one register here. That should
965 be true until we start messing with multi-reg parameters. */
966 if ((7 + (MMIX_FUNCTION_ARG_SIZE (arg
.mode
, arg
.type
))) / 8 != 1)
967 internal_error ("MMIX Internal: Last named vararg would not fit in a register");
970 /* TARGET_ASM_TRAMPOLINE_TEMPLATE. */
973 mmix_asm_trampoline_template (FILE *stream
)
975 /* Read a value into the static-chain register and jump somewhere. The
976 static chain is stored at offset 16, and the function address is
977 stored at offset 24. */
979 fprintf (stream
, "\tGETA $255,1F\n\t");
980 fprintf (stream
, "LDOU %s,$255,0\n\t", reg_names
[MMIX_STATIC_CHAIN_REGNUM
]);
981 fprintf (stream
, "LDOU $255,$255,8\n\t");
982 fprintf (stream
, "GO $255,$255,0\n");
983 fprintf (stream
, "1H\tOCTA 0\n\t");
984 fprintf (stream
, "OCTA 0\n");
987 /* TARGET_TRAMPOLINE_INIT. */
988 /* Set the static chain and function pointer field in the trampoline.
989 We also SYNCID here to be sure (doesn't matter in the simulator, but
990 some day it will). */
993 mmix_trampoline_init (rtx m_tramp
, tree fndecl
, rtx static_chain
)
995 rtx fnaddr
= XEXP (DECL_RTL (fndecl
), 0);
998 emit_block_move (m_tramp
, assemble_trampoline_template (),
999 GEN_INT (2*UNITS_PER_WORD
), BLOCK_OP_NORMAL
);
1001 mem
= adjust_address (m_tramp
, DImode
, 2*UNITS_PER_WORD
);
1002 emit_move_insn (mem
, static_chain
);
1003 mem
= adjust_address (m_tramp
, DImode
, 3*UNITS_PER_WORD
);
1004 emit_move_insn (mem
, fnaddr
);
1006 mem
= adjust_address (m_tramp
, DImode
, 0);
1007 emit_insn (gen_sync_icache (mem
, GEN_INT (TRAMPOLINE_SIZE
- 1)));
1010 /* We must exclude constant addresses that have an increment that is not a
1011 multiple of four bytes because of restrictions of the GETA
1012 instruction, unless TARGET_BASE_ADDRESSES. */
1015 mmix_constant_address_p (rtx x
)
1017 RTX_CODE code
= GET_CODE (x
);
1019 /* When using "base addresses", anything constant goes. */
1020 int constant_ok
= TARGET_BASE_ADDRESSES
!= 0;
1029 /* FIXME: Don't know how to dissect these. Avoid them for now,
1030 except we know they're constants. */
1034 addend
= INTVAL (x
);
1038 if (GET_MODE (x
) != VOIDmode
)
1039 /* Strange that we got here. FIXME: Check if we do. */
1041 addend
= CONST_DOUBLE_LOW (x
);
1045 /* Note that expressions with arithmetic on forward references don't
1046 work in mmixal. People using gcc assembly code with mmixal might
1047 need to move arrays and such to before the point of use. */
1048 if (GET_CODE (XEXP (x
, 0)) == PLUS
)
1050 rtx x0
= XEXP (XEXP (x
, 0), 0);
1051 rtx x1
= XEXP (XEXP (x
, 0), 1);
1053 if ((GET_CODE (x0
) == SYMBOL_REF
1054 || GET_CODE (x0
) == LABEL_REF
)
1055 && (GET_CODE (x1
) == CONST_INT
1056 || (GET_CODE (x1
) == CONST_DOUBLE
1057 && GET_MODE (x1
) == VOIDmode
)))
1058 addend
= mmix_intval (x1
);
1070 return constant_ok
|| (addend
& 3) == 0;
1073 /* Return 1 if the address is OK, otherwise 0. */
1076 mmix_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
1078 bool strict_checking
)
1080 #define MMIX_REG_OK(X) \
1082 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
1083 || (reg_renumber[REGNO (X)] > 0 \
1084 && reg_renumber[REGNO (X)] <= MMIX_LAST_GENERAL_REGISTER))) \
1085 || (!strict_checking \
1086 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
1087 || REGNO (X) >= FIRST_PSEUDO_REGISTER \
1088 || REGNO (X) == ARG_POINTER_REGNUM)))
1092 (mem (plus reg reg))
1093 (mem (plus reg 0..255)).
1094 unless TARGET_BASE_ADDRESSES, in which case we accept all
1095 (mem constant_address) too. */
1099 if (REG_P (x
) && MMIX_REG_OK (x
))
1102 if (GET_CODE(x
) == PLUS
)
1104 rtx x1
= XEXP (x
, 0);
1105 rtx x2
= XEXP (x
, 1);
1107 /* Try swapping the order. FIXME: Do we need this? */
1115 /* (mem (plus (reg?) (?))) */
1116 if (!REG_P (x1
) || !MMIX_REG_OK (x1
))
1117 return TARGET_BASE_ADDRESSES
&& mmix_constant_address_p (x
);
1119 /* (mem (plus (reg) (reg?))) */
1120 if (REG_P (x2
) && MMIX_REG_OK (x2
))
1123 /* (mem (plus (reg) (0..255?))) */
1124 if (satisfies_constraint_I (x2
))
1130 return TARGET_BASE_ADDRESSES
&& mmix_constant_address_p (x
);
1133 /* Implement TARGET_LEGITIMATE_CONSTANT_P. */
1136 mmix_legitimate_constant_p (machine_mode mode ATTRIBUTE_UNUSED
, rtx x
)
1138 RTX_CODE code
= GET_CODE (x
);
1140 /* We must allow any number due to the way the cse passes works; if we
1141 do not allow any number here, general_operand will fail, and insns
1142 will fatally fail recognition instead of "softly". */
1143 if (code
== CONST_INT
|| code
== CONST_DOUBLE
)
1146 return CONSTANT_ADDRESS_P (x
);
1149 /* SELECT_CC_MODE. */
1152 mmix_select_cc_mode (RTX_CODE op
, rtx x
, rtx y ATTRIBUTE_UNUSED
)
1154 /* We use CCmode, CC_UNSmode, CC_FPmode, CC_FPEQmode and CC_FUNmode to
1155 output different compare insns. Note that we do not check the
1156 validity of the comparison here. */
1158 if (GET_MODE_CLASS (GET_MODE (x
)) == MODE_FLOAT
)
1160 if (op
== ORDERED
|| op
== UNORDERED
|| op
== UNGE
1161 || op
== UNGT
|| op
== UNLE
|| op
== UNLT
)
1164 if (op
== EQ
|| op
== NE
)
1170 if (op
== GTU
|| op
== LTU
|| op
== GEU
|| op
== LEU
)
1176 /* REVERSIBLE_CC_MODE. */
1179 mmix_reversible_cc_mode (machine_mode mode
)
1181 /* That is, all integer and the EQ, NE, ORDERED and UNORDERED float
1183 return mode
!= CC_FPmode
;
1186 /* TARGET_RTX_COSTS. */
1189 mmix_rtx_costs (rtx x ATTRIBUTE_UNUSED
,
1190 machine_mode mode ATTRIBUTE_UNUSED
,
1191 int outer_code ATTRIBUTE_UNUSED
,
1192 int opno ATTRIBUTE_UNUSED
,
1193 int *total ATTRIBUTE_UNUSED
,
1194 bool speed ATTRIBUTE_UNUSED
)
1196 /* For the time being, this is just a stub and we'll accept the
1197 generic calculations, until we can do measurements, at least.
1198 Say we did not modify any calculated costs. */
1202 /* TARGET_REGISTER_MOVE_COST.
1204 The special registers can only move to and from general regs, and we
1205 need to check that their constraints match, so say 3 for them. */
1208 mmix_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1212 return (from
== GENERAL_REGS
&& from
== to
) ? 2 : 3;
1215 /* Note that we don't have a TEXT_SECTION_ASM_OP, because it has to be a
1216 compile-time constant; it's used in an asm in crtstuff.c, compiled for
1219 /* DATA_SECTION_ASM_OP. */
1222 mmix_data_section_asm_op (void)
1224 return "\t.data ! mmixal:= 8H LOC 9B";
1228 mmix_encode_section_info (tree decl
, rtx rtl
, int first
)
1230 /* Test for an external declaration, and do nothing if it is one. */
1231 if ((TREE_CODE (decl
) == VAR_DECL
1232 && (DECL_EXTERNAL (decl
) || TREE_PUBLIC (decl
)))
1233 || (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_PUBLIC (decl
)))
1235 else if (first
&& DECL_P (decl
))
1237 /* For non-visible declarations, add a "@" prefix, which we skip
1238 when the label is output. If the label does not have this
1239 prefix, a ":" is output if -mtoplevel-symbols.
1241 Note that this does not work for data that is declared extern and
1242 later defined as static. If there's code in between, that code
1243 will refer to the extern declaration, and vice versa. This just
1244 means that when -mtoplevel-symbols is in use, we can just handle
1245 well-behaved ISO-compliant code. */
1247 const char *str
= XSTR (XEXP (rtl
, 0), 0);
1248 int len
= strlen (str
);
1249 char *newstr
= XALLOCAVEC (char, len
+ 2);
1251 strcpy (newstr
+ 1, str
);
1252 XSTR (XEXP (rtl
, 0), 0) = ggc_alloc_string (newstr
, len
+ 1);
1255 /* Set SYMBOL_REF_FLAG for things that we want to access with GETA. We
1256 may need different options to reach for different things with GETA.
1257 For now, functions and things we know or have been told are constant. */
1258 if (TREE_CODE (decl
) == FUNCTION_DECL
1259 || TREE_CONSTANT (decl
)
1260 || (TREE_CODE (decl
) == VAR_DECL
1261 && TREE_READONLY (decl
)
1262 && !TREE_SIDE_EFFECTS (decl
)
1263 && (!DECL_INITIAL (decl
)
1264 || TREE_CONSTANT (DECL_INITIAL (decl
)))))
1265 SYMBOL_REF_FLAG (XEXP (rtl
, 0)) = 1;
1269 mmix_strip_name_encoding (const char *name
)
1271 for (; (*name
== '@' || *name
== '*'); name
++)
1277 /* TARGET_ASM_FILE_START.
1278 We just emit a little comment for the time being. */
1281 mmix_file_start (void)
1283 default_file_start ();
1285 fputs ("! mmixal:= 8H LOC Data_Section\n", asm_out_file
);
1287 /* Make sure each file starts with the text section. */
1288 switch_to_section (text_section
);
1291 /* TARGET_ASM_FILE_END. */
1294 mmix_file_end (void)
1296 /* Make sure each file ends with the data section. */
1297 switch_to_section (data_section
);
1300 /* TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
1303 mmix_asm_output_source_filename (FILE *stream
, const char *name
)
1305 fprintf (stream
, "# 1 ");
1306 OUTPUT_QUOTED_STRING (stream
, name
);
1307 fprintf (stream
, "\n");
1310 /* Unfortunately, by default __builtin_ffs is expanded to ffs for
1311 targets where INT_TYPE_SIZE < BITS_PER_WORD. That together with
1312 newlib since 2017-07-04 implementing ffs as __builtin_ffs leads to
1313 (newlib) ffs recursively calling itself. But, because of argument
1314 promotion, and with ffs we're counting from the least bit, the
1315 libgcc equivalent for ffsl works equally well for int arguments, so
1319 mmix_init_libfuncs (void)
1321 set_optab_libfunc (ffs_optab
, SImode
, "__ffsdi2");
1324 /* OUTPUT_QUOTED_STRING. */
1327 mmix_output_quoted_string (FILE *stream
, const char *string
, int length
)
1329 const char * string_end
= string
+ length
;
1330 static const char *const unwanted_chars
= "\"[]\\";
1332 /* Output "any character except newline and double quote character". We
1333 play it safe and avoid all control characters too. We also do not
1334 want [] as characters, should input be passed through m4 with [] as
1335 quotes. Further, we avoid "\", because the GAS port handles it as a
1336 quoting character. */
1337 while (string
< string_end
)
1340 && (unsigned char) *string
< 128
1341 && !ISCNTRL (*string
)
1342 && strchr (unwanted_chars
, *string
) == NULL
)
1344 fputc ('"', stream
);
1346 && (unsigned char) *string
< 128
1347 && !ISCNTRL (*string
)
1348 && strchr (unwanted_chars
, *string
) == NULL
1349 && string
< string_end
)
1351 fputc (*string
, stream
);
1354 fputc ('"', stream
);
1355 if (string
< string_end
)
1356 fprintf (stream
, ",");
1358 if (string
< string_end
)
1360 fprintf (stream
, "#%x", *string
& 255);
1362 if (string
< string_end
)
1363 fprintf (stream
, ",");
1368 /* Target hook for assembling integer objects. Use mmix_print_operand
1369 for WYDE and TETRA. Use mmix_output_octa to output 8-byte
1373 mmix_assemble_integer (rtx x
, unsigned int size
, int aligned_p
)
1378 /* We handle a limited number of types of operands in here. But
1379 that's ok, because we can punt to generic functions. We then
1380 pretend that aligned data isn't needed, so the usual .<pseudo>
1381 syntax is used (which works for aligned data too). We actually
1382 *must* do that, since we say we don't have simple aligned
1383 pseudos, causing this function to be called. We just try and
1384 keep as much compatibility as possible with mmixal syntax for
1385 normal cases (i.e. without GNU extensions and C only). */
1387 if (GET_CODE (x
) != CONST_INT
)
1389 /* There is no "unaligned byte" op or generic function to
1390 which we can punt, so we have to handle this here. As
1391 the expression isn't a plain literal, the generated
1392 assembly-code can't be mmixal-equivalent (i.e. "BYTE"
1393 won't work) and thus it's ok to emit the default op
1395 assemble_integer_with_op ("\t.byte\t", x
);
1398 fputs ("\tBYTE\t", asm_out_file
);
1399 mmix_print_operand (asm_out_file
, x
, 'B');
1400 fputc ('\n', asm_out_file
);
1404 if (GET_CODE (x
) != CONST_INT
)
1409 fputs ("\tWYDE\t", asm_out_file
);
1410 mmix_print_operand (asm_out_file
, x
, 'W');
1411 fputc ('\n', asm_out_file
);
1415 if (GET_CODE (x
) != CONST_INT
)
1420 fputs ("\tTETRA\t", asm_out_file
);
1421 mmix_print_operand (asm_out_file
, x
, 'L');
1422 fputc ('\n', asm_out_file
);
1426 /* We don't get here anymore for CONST_DOUBLE, because DImode
1427 isn't expressed as CONST_DOUBLE, and DFmode is handled
1429 gcc_assert (GET_CODE (x
) != CONST_DOUBLE
);
1430 assemble_integer_with_op ("\tOCTA\t", x
);
1433 return default_assemble_integer (x
, size
, aligned_p
);
1436 /* ASM_OUTPUT_ASCII. */
1439 mmix_asm_output_ascii (FILE *stream
, const char *string
, int length
)
1443 int chunk_size
= length
> 60 ? 60 : length
;
1444 fprintf (stream
, "\tBYTE ");
1445 mmix_output_quoted_string (stream
, string
, chunk_size
);
1446 string
+= chunk_size
;
1447 length
-= chunk_size
;
1448 fprintf (stream
, "\n");
1452 /* ASM_OUTPUT_ALIGNED_COMMON. */
1455 mmix_asm_output_aligned_common (FILE *stream
,
1460 /* This is mostly the elfos.h one. There doesn't seem to be a way to
1461 express this in a mmixal-compatible way. */
1462 fprintf (stream
, "\t.comm\t");
1463 assemble_name (stream
, name
);
1464 fprintf (stream
, ",%u,%u ! mmixal-incompatible COMMON\n",
1465 size
, align
/ BITS_PER_UNIT
);
1468 /* ASM_OUTPUT_ALIGNED_LOCAL. */
1471 mmix_asm_output_aligned_local (FILE *stream
,
1476 switch_to_section (data_section
);
1478 ASM_OUTPUT_ALIGN (stream
, exact_log2 (align
/BITS_PER_UNIT
));
1479 assemble_name (stream
, name
);
1480 fprintf (stream
, "\tLOC @+%d\n", size
);
1483 /* ASM_OUTPUT_LABEL. */
1486 mmix_asm_output_label (FILE *stream
, const char *name
)
1488 assemble_name (stream
, name
);
1489 fprintf (stream
, "\tIS @\n");
1492 /* ASM_OUTPUT_INTERNAL_LABEL. */
1495 mmix_asm_output_internal_label (FILE *stream
, const char *name
)
1497 assemble_name_raw (stream
, name
);
1498 fprintf (stream
, "\tIS @\n");
1501 /* ASM_DECLARE_REGISTER_GLOBAL. */
1504 mmix_asm_declare_register_global (FILE *stream ATTRIBUTE_UNUSED
,
1505 tree decl ATTRIBUTE_UNUSED
,
1506 int regno ATTRIBUTE_UNUSED
,
1507 const char *name ATTRIBUTE_UNUSED
)
1509 /* Nothing to do here, but there *will* be, therefore the framework is
1513 /* ASM_WEAKEN_LABEL. */
1516 mmix_asm_weaken_label (FILE *stream ATTRIBUTE_UNUSED
,
1517 const char *name ATTRIBUTE_UNUSED
)
1519 fprintf (stream
, "\t.weak ");
1520 assemble_name (stream
, name
);
1521 fprintf (stream
, " ! mmixal-incompatible\n");
1524 /* MAKE_DECL_ONE_ONLY. */
1527 mmix_make_decl_one_only (tree decl
)
1529 DECL_WEAK (decl
) = 1;
1532 /* ASM_OUTPUT_LABELREF.
1533 Strip GCC's '*' and our own '@'. No order is assumed. */
1536 mmix_asm_output_labelref (FILE *stream
, const char *name
)
1540 for (; (*name
== '@' || *name
== '*'); name
++)
1544 asm_fprintf (stream
, "%s%U%s",
1545 is_extern
&& TARGET_TOPLEVEL_SYMBOLS
? ":" : "",
1549 /* ASM_OUTPUT_DEF. */
1552 mmix_asm_output_def (FILE *stream
, const char *name
, const char *value
)
1554 assemble_name (stream
, name
);
1555 fprintf (stream
, "\tIS ");
1556 assemble_name (stream
, value
);
1557 fputc ('\n', stream
);
1560 /* TARGET_PRINT_OPERAND. */
1563 mmix_print_operand (FILE *stream
, rtx x
, int code
)
1565 /* When we add support for different codes later, we can, when needed,
1566 drop through to the main handler with a modified operand. */
1568 int regno
= x
!= NULL_RTX
&& REG_P (x
) ? REGNO (x
) : 0;
1572 /* Unrelated codes are in alphabetic order. */
1575 /* For conditional branches, output "P" for a probable branch. */
1576 if (TARGET_BRANCH_PREDICT
)
1578 x
= find_reg_note (current_output_insn
, REG_BR_PROB
, 0);
1579 if (x
&& profile_probability::from_reg_br_prob_note (XINT (x
, 0))
1580 > profile_probability::even ())
1586 /* For the %d in POP %d,0. */
1587 fprintf (stream
, "%d", MMIX_POP_ARGUMENT ());
1591 if (GET_CODE (x
) != CONST_INT
)
1592 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x
);
1593 fprintf (stream
, "%d", (int) (INTVAL (x
) & 0xff));
1597 /* Highpart. Must be general register, and not the last one, as
1598 that one cannot be part of a consecutive register pair. */
1599 if (regno
> MMIX_LAST_GENERAL_REGISTER
- 1)
1600 internal_error ("MMIX Internal: Bad register: %d", regno
);
1602 /* This is big-endian, so the high-part is the first one. */
1603 fprintf (stream
, "%s", reg_names
[MMIX_OUTPUT_REGNO (regno
)]);
1607 /* Lowpart. Must be CONST_INT or general register, and not the last
1608 one, as that one cannot be part of a consecutive register pair. */
1609 if (GET_CODE (x
) == CONST_INT
)
1611 fprintf (stream
, "#%lx",
1612 (unsigned long) (INTVAL (x
)
1613 & ((unsigned int) 0x7fffffff * 2 + 1)));
1617 if (GET_CODE (x
) == SYMBOL_REF
)
1619 output_addr_const (stream
, x
);
1623 if (regno
> MMIX_LAST_GENERAL_REGISTER
- 1)
1624 internal_error ("MMIX Internal: Bad register: %d", regno
);
1626 /* This is big-endian, so the low-part is + 1. */
1627 fprintf (stream
, "%s", reg_names
[MMIX_OUTPUT_REGNO (regno
) + 1]);
1630 /* Can't use 'a' because that's a generic modifier for address
1633 mmix_output_shiftvalue_op_from_str (stream
, "ANDN",
1639 mmix_output_shiftvalue_op_from_str (stream
, "INC",
1645 mmix_output_shiftvalue_op_from_str (stream
, "OR",
1651 mmix_output_shiftvalue_op_from_str (stream
, "SET",
1658 mmix_output_condition (stream
, x
, (code
== 'D'));
1662 /* Output an extra "e" to make fcmpe, fune. */
1663 if (TARGET_FCMP_EPSILON
)
1664 fprintf (stream
, "e");
1668 /* Output the number minus 1. */
1669 if (GET_CODE (x
) != CONST_INT
)
1671 fatal_insn ("MMIX Internal: Bad value for 'm', not a CONST_INT",
1674 fprintf (stream
, "%" PRId64
,
1675 (int64_t) (mmix_intval (x
) - 1));
1679 /* Store the number of registers we want to save. This was setup
1680 by the prologue. The actual operand contains the number of
1681 registers to pass, but we don't use it currently. Anyway, we
1682 need to output the number of saved registers here. */
1683 fprintf (stream
, "%d",
1684 cfun
->machine
->highest_saved_stack_register
+ 1);
1688 /* Store the register to output a constant to. */
1690 fatal_insn ("MMIX Internal: Expected a register, not this", x
);
1691 mmix_output_destination_register
= MMIX_OUTPUT_REGNO (regno
);
1695 /* Output the constant. Note that we use this for floats as well. */
1696 if (GET_CODE (x
) != CONST_INT
1697 && (GET_CODE (x
) != CONST_DOUBLE
1698 || (GET_MODE (x
) != VOIDmode
&& GET_MODE (x
) != DFmode
1699 && GET_MODE (x
) != SFmode
)))
1700 fatal_insn ("MMIX Internal: Expected a constant, not this", x
);
1701 mmix_output_register_setting (stream
,
1702 mmix_output_destination_register
,
1703 mmix_intval (x
), 0);
1707 /* An U for unsigned, if TARGET_ZERO_EXTEND. Ignore the operand. */
1708 if (TARGET_ZERO_EXTEND
)
1713 mmix_output_shifted_value (stream
, (int64_t) mmix_intval (x
));
1717 mmix_output_shifted_value (stream
, (int64_t) ~mmix_intval (x
));
1721 if (GET_CODE (x
) != CONST_INT
)
1722 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x
);
1723 fprintf (stream
, "#%x", (int) (INTVAL (x
) & 0xffff));
1727 /* Nothing to do. */
1731 /* Presumably there's a missing case above if we get here. */
1732 internal_error ("MMIX Internal: Missing %qc case in mmix_print_operand", code
);
1735 switch (GET_CODE (modified_x
))
1738 regno
= REGNO (modified_x
);
1739 if (regno
>= FIRST_PSEUDO_REGISTER
)
1740 internal_error ("MMIX Internal: Bad register: %d", regno
);
1741 fprintf (stream
, "%s", reg_names
[MMIX_OUTPUT_REGNO (regno
)]);
1745 output_address (GET_MODE (modified_x
), XEXP (modified_x
, 0));
1749 /* For -2147483648, mmixal complains that the constant does not fit
1750 in 4 bytes, so let's output it as hex. Take care to handle hosts
1751 where HOST_WIDE_INT is longer than an int.
1753 Print small constants +-255 using decimal. */
1755 if (INTVAL (modified_x
) > -256 && INTVAL (modified_x
) < 256)
1756 fprintf (stream
, "%d", (int) (INTVAL (modified_x
)));
1758 fprintf (stream
, "#%x",
1759 (int) (INTVAL (modified_x
)) & (unsigned int) ~0);
1763 /* Do somewhat as CONST_INT. */
1764 mmix_output_octa (stream
, mmix_intval (modified_x
), 0);
1768 output_addr_const (stream
, modified_x
);
1772 /* No need to test for all strange things. Let output_addr_const do
1774 if (CONSTANT_P (modified_x
)
1775 /* Strangely enough, this is not included in CONSTANT_P.
1776 FIXME: Ask/check about sanity here. */
1777 || LABEL_P (modified_x
))
1779 output_addr_const (stream
, modified_x
);
1783 /* We need the original here. */
1784 fatal_insn ("MMIX Internal: Cannot decode this operand", x
);
1788 /* TARGET_PRINT_OPERAND_PUNCT_VALID_P. */
1791 mmix_print_operand_punct_valid_p (unsigned char code
)
1793 /* A '+' is used for branch prediction, similar to other ports. */
1795 /* A '.' is used for the %d in the POP %d,0 return insn. */
1799 /* TARGET_PRINT_OPERAND_ADDRESS. */
1802 mmix_print_operand_address (FILE *stream
, machine_mode
/*mode*/, rtx x
)
1806 /* I find the generated assembly code harder to read without
1808 fprintf (stream
, "%s,0", reg_names
[MMIX_OUTPUT_REGNO (REGNO (x
))]);
1811 else if (GET_CODE (x
) == PLUS
)
1813 rtx x1
= XEXP (x
, 0);
1814 rtx x2
= XEXP (x
, 1);
1818 fprintf (stream
, "%s,", reg_names
[MMIX_OUTPUT_REGNO (REGNO (x1
))]);
1822 fprintf (stream
, "%s",
1823 reg_names
[MMIX_OUTPUT_REGNO (REGNO (x2
))]);
1826 else if (satisfies_constraint_I (x2
))
1828 output_addr_const (stream
, x2
);
1834 if (TARGET_BASE_ADDRESSES
&& mmix_legitimate_constant_p (Pmode
, x
))
1836 output_addr_const (stream
, x
);
1840 fatal_insn ("MMIX Internal: This is not a recognized address", x
);
1843 /* ASM_OUTPUT_REG_PUSH. */
1846 mmix_asm_output_reg_push (FILE *stream
, int regno
)
1848 fprintf (stream
, "\tSUBU %s,%s,8\n\tSTOU %s,%s,0\n",
1849 reg_names
[MMIX_STACK_POINTER_REGNUM
],
1850 reg_names
[MMIX_STACK_POINTER_REGNUM
],
1851 reg_names
[MMIX_OUTPUT_REGNO (regno
)],
1852 reg_names
[MMIX_STACK_POINTER_REGNUM
]);
1855 /* ASM_OUTPUT_REG_POP. */
1858 mmix_asm_output_reg_pop (FILE *stream
, int regno
)
1860 fprintf (stream
, "\tLDOU %s,%s,0\n\tINCL %s,8\n",
1861 reg_names
[MMIX_OUTPUT_REGNO (regno
)],
1862 reg_names
[MMIX_STACK_POINTER_REGNUM
],
1863 reg_names
[MMIX_STACK_POINTER_REGNUM
]);
1866 /* ASM_OUTPUT_ADDR_DIFF_ELT. */
1869 mmix_asm_output_addr_diff_elt (FILE *stream
,
1870 rtx body ATTRIBUTE_UNUSED
,
1874 fprintf (stream
, "\tTETRA L%d-L%d\n", value
, rel
);
1877 /* ASM_OUTPUT_ADDR_VEC_ELT. */
1880 mmix_asm_output_addr_vec_elt (FILE *stream
, int value
)
1882 fprintf (stream
, "\tOCTA L:%d\n", value
);
1885 /* ASM_OUTPUT_SKIP. */
1888 mmix_asm_output_skip (FILE *stream
, int nbytes
)
1890 fprintf (stream
, "\tLOC @+%d\n", nbytes
);
1893 /* ASM_OUTPUT_ALIGN. */
1896 mmix_asm_output_align (FILE *stream
, int power
)
1898 /* We need to record the needed alignment of this section in the object,
1899 so we have to output an alignment directive. Use a .p2align (not
1900 .align) so people will never have to wonder about whether the
1901 argument is in number of bytes or the log2 thereof. We do it in
1902 addition to the LOC directive, so nothing needs tweaking when
1903 copy-pasting assembly into mmixal. */
1904 fprintf (stream
, "\t.p2align %d\n", power
);
1905 fprintf (stream
, "\tLOC @+(%d-@)&%d\n", 1 << power
, (1 << power
) - 1);
1908 /* DBX_REGISTER_NUMBER. */
1911 mmix_dbx_register_number (unsigned regno
)
1913 /* Adjust the register number to the one it will be output as, dammit.
1914 It'd be nice if we could check the assumption that we're filling a
1915 gap, but every register between the last saved register and parameter
1916 registers might be a valid parameter register. */
1917 regno
= MMIX_OUTPUT_REGNO (regno
);
1919 /* We need to renumber registers to get the number of the return address
1920 register in the range 0..255. It is also space-saving if registers
1921 mentioned in the call-frame information (which uses this function by
1922 defaulting DWARF_FRAME_REGNUM to DBX_REGISTER_NUMBER) are numbered
1923 0 .. 63. So map 224 .. 256+15 -> 0 .. 47 and 0 .. 223 -> 48..223+48. */
1924 return regno
>= 224 ? (regno
- 224) : (regno
+ 48);
1927 /* End of target macro support functions.
1929 Now the MMIX port's own functions. First the exported ones. */
1931 /* Wrapper for get_hard_reg_initial_val since integrate.h isn't included
1932 from insn-emit.c. */
1935 mmix_get_hard_reg_initial_val (machine_mode mode
, int regno
)
1937 return get_hard_reg_initial_val (mode
, regno
);
1940 /* Nonzero when the function epilogue is simple enough that a single
1941 "POP %d,0" should be used even within the function. */
1944 mmix_use_simple_return (void)
1948 int stack_space_to_allocate
1949 = (crtl
->outgoing_args_size
1950 + crtl
->args
.pretend_args_size
1951 + get_frame_size () + 7) & ~7;
1953 if (!TARGET_USE_RETURN_INSN
|| !reload_completed
)
1957 regno
>= MMIX_FIRST_GLOBAL_REGNUM
;
1959 /* Note that we assume that the frame-pointer-register is one of these
1960 registers, in which case we don't count it here. */
1961 if ((((regno
!= MMIX_FRAME_POINTER_REGNUM
|| !frame_pointer_needed
)
1962 && df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
)))
1963 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
1966 if (frame_pointer_needed
)
1967 stack_space_to_allocate
+= 8;
1969 if (MMIX_CFUN_HAS_LANDING_PAD
)
1970 stack_space_to_allocate
+= 16;
1971 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
)
1972 stack_space_to_allocate
+= 8;
1974 return stack_space_to_allocate
== 0;
1978 /* Expands the function prologue into RTX. */
1981 mmix_expand_prologue (void)
1983 HOST_WIDE_INT locals_size
= get_frame_size ();
1985 HOST_WIDE_INT stack_space_to_allocate
1986 = (crtl
->outgoing_args_size
1987 + crtl
->args
.pretend_args_size
1988 + locals_size
+ 7) & ~7;
1989 HOST_WIDE_INT offset
= -8;
1991 /* Add room needed to save global non-register-stack registers. */
1993 regno
>= MMIX_FIRST_GLOBAL_REGNUM
;
1995 /* Note that we assume that the frame-pointer-register is one of these
1996 registers, in which case we don't count it here. */
1997 if ((((regno
!= MMIX_FRAME_POINTER_REGNUM
|| !frame_pointer_needed
)
1998 && df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
)))
1999 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
2000 stack_space_to_allocate
+= 8;
2002 /* If we do have a frame-pointer, add room for it. */
2003 if (frame_pointer_needed
)
2004 stack_space_to_allocate
+= 8;
2006 /* If we have a non-local label, we need to be able to unwind to it, so
2007 store the current register stack pointer. Also store the return
2008 address if we do that. */
2009 if (MMIX_CFUN_HAS_LANDING_PAD
)
2010 stack_space_to_allocate
+= 16;
2011 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
)
2012 /* If we do have a saved return-address slot, add room for it. */
2013 stack_space_to_allocate
+= 8;
2015 /* Make sure we don't get an unaligned stack. */
2016 if ((stack_space_to_allocate
% 8) != 0)
2017 internal_error ("stack frame not a multiple of 8 bytes: %wd",
2018 stack_space_to_allocate
);
2020 if (crtl
->args
.pretend_args_size
)
2022 int mmix_first_vararg_reg
2023 = (MMIX_FIRST_INCOMING_ARG_REGNUM
2024 + (MMIX_MAX_ARGS_IN_REGS
2025 - crtl
->args
.pretend_args_size
/ 8));
2028 = MMIX_FIRST_INCOMING_ARG_REGNUM
+ MMIX_MAX_ARGS_IN_REGS
- 1;
2029 regno
>= mmix_first_vararg_reg
;
2034 HOST_WIDE_INT stack_chunk
2035 = stack_space_to_allocate
> (256 - 8)
2036 ? (256 - 8) : stack_space_to_allocate
;
2038 mmix_emit_sp_add (-stack_chunk
);
2039 offset
+= stack_chunk
;
2040 stack_space_to_allocate
-= stack_chunk
;
2043 /* These registers aren't actually saved (as in "will be
2044 restored"), so don't tell DWARF2 they're saved. */
2045 emit_move_insn (gen_rtx_MEM (DImode
,
2046 plus_constant (Pmode
, stack_pointer_rtx
,
2048 gen_rtx_REG (DImode
, regno
));
2053 /* Store the frame-pointer. */
2055 if (frame_pointer_needed
)
2061 /* Get 8 less than otherwise, since we need to reach offset + 8. */
2062 HOST_WIDE_INT stack_chunk
2063 = stack_space_to_allocate
> (256 - 8 - 8)
2064 ? (256 - 8 - 8) : stack_space_to_allocate
;
2066 mmix_emit_sp_add (-stack_chunk
);
2068 offset
+= stack_chunk
;
2069 stack_space_to_allocate
-= stack_chunk
;
2072 insn
= emit_move_insn (gen_rtx_MEM (DImode
,
2073 plus_constant (Pmode
,
2076 hard_frame_pointer_rtx
);
2077 RTX_FRAME_RELATED_P (insn
) = 1;
2078 insn
= emit_insn (gen_adddi3 (hard_frame_pointer_rtx
,
2080 GEN_INT (offset
+ 8)));
2081 RTX_FRAME_RELATED_P (insn
) = 1;
2085 if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
)
2090 /* Store the return-address, if one is needed on the stack. We
2091 usually store it in a register when needed, but that doesn't work
2092 with -fexceptions. */
2096 /* Get 8 less than otherwise, since we need to reach offset + 8. */
2097 HOST_WIDE_INT stack_chunk
2098 = stack_space_to_allocate
> (256 - 8 - 8)
2099 ? (256 - 8 - 8) : stack_space_to_allocate
;
2101 mmix_emit_sp_add (-stack_chunk
);
2103 offset
+= stack_chunk
;
2104 stack_space_to_allocate
-= stack_chunk
;
2107 tmpreg
= gen_rtx_REG (DImode
, 255);
2108 retreg
= gen_rtx_REG (DImode
, MMIX_rJ_REGNUM
);
2110 /* Dwarf2 code is confused by the use of a temporary register for
2111 storing the return address, so we have to express it as a note,
2112 which we attach to the actual store insn. */
2113 emit_move_insn (tmpreg
, retreg
);
2115 insn
= emit_move_insn (gen_rtx_MEM (DImode
,
2116 plus_constant (Pmode
,
2120 RTX_FRAME_RELATED_P (insn
) = 1;
2121 add_reg_note (insn
, REG_FRAME_RELATED_EXPR
,
2122 gen_rtx_SET (gen_rtx_MEM (DImode
,
2123 plus_constant (Pmode
,
2130 else if (MMIX_CFUN_HAS_LANDING_PAD
)
2133 if (MMIX_CFUN_HAS_LANDING_PAD
)
2135 /* Store the register defining the numbering of local registers, so
2136 we know how long to unwind the register stack. */
2140 /* Get 8 less than otherwise, since we need to reach offset + 8. */
2141 HOST_WIDE_INT stack_chunk
2142 = stack_space_to_allocate
> (256 - 8 - 8)
2143 ? (256 - 8 - 8) : stack_space_to_allocate
;
2145 mmix_emit_sp_add (-stack_chunk
);
2147 offset
+= stack_chunk
;
2148 stack_space_to_allocate
-= stack_chunk
;
2151 /* We don't tell dwarf2 about this one; we just have it to unwind
2152 the register stack at landing pads. FIXME: It's a kludge because
2153 we can't describe the effect of the PUSHJ and PUSHGO insns on the
2154 register stack at the moment. Best thing would be to handle it
2155 like stack-pointer offsets. Better: some hook into dwarf2out.c
2156 to produce DW_CFA_expression:s that specify the increment of rO,
2157 and unwind it at eh_return (preferred) or at the landing pad.
2158 Then saves to $0..$G-1 could be specified through that register. */
2160 emit_move_insn (gen_rtx_REG (DImode
, 255),
2161 gen_rtx_REG (DImode
,
2163 emit_move_insn (gen_rtx_MEM (DImode
,
2164 plus_constant (Pmode
, stack_pointer_rtx
,
2166 gen_rtx_REG (DImode
, 255));
2170 /* After the return-address and the frame-pointer, we have the local
2171 variables. They're the ones that may have an "unaligned" size. */
2172 offset
-= (locals_size
+ 7) & ~7;
2174 /* Now store all registers that are global, i.e. not saved by the
2175 register file machinery.
2177 It is assumed that the frame-pointer is one of these registers, so it
2178 is explicitly excluded in the count. */
2181 regno
>= MMIX_FIRST_GLOBAL_REGNUM
;
2183 if (((regno
!= MMIX_FRAME_POINTER_REGNUM
|| !frame_pointer_needed
)
2184 && df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
))
2185 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
2191 HOST_WIDE_INT stack_chunk
2192 = (stack_space_to_allocate
> (256 - offset
- 8)
2193 ? (256 - offset
- 8) : stack_space_to_allocate
);
2195 mmix_emit_sp_add (-stack_chunk
);
2196 offset
+= stack_chunk
;
2197 stack_space_to_allocate
-= stack_chunk
;
2200 insn
= emit_move_insn (gen_rtx_MEM (DImode
,
2201 plus_constant (Pmode
,
2204 gen_rtx_REG (DImode
, regno
));
2205 RTX_FRAME_RELATED_P (insn
) = 1;
2209 /* Finally, allocate room for outgoing args and local vars if room
2210 wasn't allocated above. */
2211 if (stack_space_to_allocate
)
2212 mmix_emit_sp_add (-stack_space_to_allocate
);
2215 /* Expands the function epilogue into RTX. */
2218 mmix_expand_epilogue (void)
2220 HOST_WIDE_INT locals_size
= get_frame_size ();
2222 HOST_WIDE_INT stack_space_to_deallocate
2223 = (crtl
->outgoing_args_size
2224 + crtl
->args
.pretend_args_size
2225 + locals_size
+ 7) & ~7;
2227 /* The first address to access is beyond the outgoing_args area. */
2228 HOST_WIDE_INT offset
= crtl
->outgoing_args_size
;
2230 /* Add the space for global non-register-stack registers.
2231 It is assumed that the frame-pointer register can be one of these
2232 registers, in which case it is excluded from the count when needed. */
2234 regno
>= MMIX_FIRST_GLOBAL_REGNUM
;
2236 if (((regno
!= MMIX_FRAME_POINTER_REGNUM
|| !frame_pointer_needed
)
2237 && df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
))
2238 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
2239 stack_space_to_deallocate
+= 8;
2241 /* Add in the space for register stack-pointer. If so, always add room
2242 for the saved PC. */
2243 if (MMIX_CFUN_HAS_LANDING_PAD
)
2244 stack_space_to_deallocate
+= 16;
2245 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
)
2246 /* If we have a saved return-address slot, add it in. */
2247 stack_space_to_deallocate
+= 8;
2249 /* Add in the frame-pointer. */
2250 if (frame_pointer_needed
)
2251 stack_space_to_deallocate
+= 8;
2253 /* Make sure we don't get an unaligned stack. */
2254 if ((stack_space_to_deallocate
% 8) != 0)
2255 internal_error ("stack frame not a multiple of octabyte: %wd",
2256 stack_space_to_deallocate
);
2258 /* We will add back small offsets to the stack pointer as we go.
2259 First, we restore all registers that are global, i.e. not saved by
2260 the register file machinery. */
2262 for (regno
= MMIX_FIRST_GLOBAL_REGNUM
;
2265 if (((regno
!= MMIX_FRAME_POINTER_REGNUM
|| !frame_pointer_needed
)
2266 && df_regs_ever_live_p (regno
) && !call_used_or_fixed_reg_p (regno
))
2267 || IS_MMIX_EH_RETURN_DATA_REG (regno
))
2271 mmix_emit_sp_add (offset
);
2272 stack_space_to_deallocate
-= offset
;
2276 emit_move_insn (gen_rtx_REG (DImode
, regno
),
2277 gen_rtx_MEM (DImode
,
2278 plus_constant (Pmode
, stack_pointer_rtx
,
2283 /* Here is where the local variables were. As in the prologue, they
2284 might be of an unaligned size. */
2285 offset
+= (locals_size
+ 7) & ~7;
2287 /* The saved register stack pointer is just below the frame-pointer
2288 register. We don't need to restore it "manually"; the POP
2289 instruction does that. */
2290 if (MMIX_CFUN_HAS_LANDING_PAD
)
2292 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS
)
2293 /* The return-address slot is just below the frame-pointer register.
2294 We don't need to restore it because we don't really use it. */
2297 /* Get back the old frame-pointer-value. */
2298 if (frame_pointer_needed
)
2302 mmix_emit_sp_add (offset
);
2304 stack_space_to_deallocate
-= offset
;
2308 emit_move_insn (hard_frame_pointer_rtx
,
2309 gen_rtx_MEM (DImode
,
2310 plus_constant (Pmode
, stack_pointer_rtx
,
2315 /* We do not need to restore pretended incoming args, just add back
2317 if (stack_space_to_deallocate
!= 0)
2318 mmix_emit_sp_add (stack_space_to_deallocate
);
2320 if (crtl
->calls_eh_return
)
2321 /* Adjust the (normal) stack-pointer to that of the receiver.
2322 FIXME: It would be nice if we could also adjust the register stack
2323 here, but we need to express it through DWARF 2 too. */
2324 emit_insn (gen_adddi3 (stack_pointer_rtx
, stack_pointer_rtx
,
2325 gen_rtx_REG (DImode
,
2326 MMIX_EH_RETURN_STACKADJ_REGNUM
)));
2329 /* Output an optimal sequence for setting a register to a specific
2330 constant. Used in an alternative for const_ints in movdi, and when
2331 using large stack-frame offsets.
2333 Use do_begin_end to say if a line-starting TAB and newline before the
2334 first insn and after the last insn is wanted. */
2337 mmix_output_register_setting (FILE *stream
,
2343 fprintf (stream
, "\t");
2345 if (insn_const_int_ok_for_constraint (value
, CONSTRAINT_K
))
2346 fprintf (stream
, "NEGU %s,0,%" PRId64
, reg_names
[regno
], -value
);
2347 else if (mmix_shiftable_wyde_value ((uint64_t) value
))
2349 /* First, the one-insn cases. */
2350 mmix_output_shiftvalue_op_from_str (stream
, "SET",
2353 fprintf (stream
, " %s,", reg_names
[regno
]);
2354 mmix_output_shifted_value (stream
, (uint64_t) value
);
2356 else if (mmix_shiftable_wyde_value (-(uint64_t) value
))
2358 /* We do this to get a bit more legible assembly code. The next
2359 alternative is mostly redundant with this. */
2361 mmix_output_shiftvalue_op_from_str (stream
, "SET",
2364 fprintf (stream
, " %s,", reg_names
[regno
]);
2365 mmix_output_shifted_value (stream
, -(uint64_t) value
);
2366 fprintf (stream
, "\n\tNEGU %s,0,%s", reg_names
[regno
],
2369 else if (mmix_shiftable_wyde_value (~(uint64_t) value
))
2371 /* Slightly more expensive, the two-insn cases. */
2373 /* FIXME: We could of course also test if 0..255-N or ~(N | 1..255)
2374 is shiftable, or any other one-insn transformation of the value.
2375 FIXME: Check first if the value is "shiftable" by two loading
2376 with two insns, since it makes more readable assembly code (if
2377 anyone else cares). */
2379 mmix_output_shiftvalue_op_from_str (stream
, "SET",
2382 fprintf (stream
, " %s,", reg_names
[regno
]);
2383 mmix_output_shifted_value (stream
, ~(uint64_t) value
);
2384 fprintf (stream
, "\n\tNOR %s,%s,0", reg_names
[regno
],
2389 /* The generic case. 2..4 insns. */
2390 static const char *const higher_parts
[] = {"L", "ML", "MH", "H"};
2391 const char *op
= "SET";
2392 const char *line_begin
= "";
2395 int64_t tmpvalue
= value
;
2397 /* Compute the number of insns needed to output this constant. */
2398 for (i
= 0; i
< 4 && tmpvalue
!= 0; i
++)
2400 if (tmpvalue
& 65535)
2404 if (TARGET_BASE_ADDRESSES
&& insns
== 3)
2406 /* The number three is based on a static observation on
2407 ghostscript-6.52. Two and four are excluded because there
2408 are too many such constants, and each unique constant (maybe
2409 offset by 1..255) were used few times compared to other uses,
2412 We use base-plus-offset addressing to force it into a global
2413 register; we just use a "LDA reg,VALUE", which will cause the
2414 assembler and linker to DTRT (for constants as well as
2416 fprintf (stream
, "LDA %s,", reg_names
[regno
]);
2417 mmix_output_octa (stream
, value
, 0);
2421 /* Output pertinent parts of the 4-wyde sequence.
2422 Still more to do if we want this to be optimal, but hey...
2423 Note that the zero case has been handled above. */
2424 for (i
= 0; i
< 4 && value
!= 0; i
++)
2428 fprintf (stream
, "%s%s%s %s,#%x", line_begin
, op
,
2429 higher_parts
[i
], reg_names
[regno
],
2430 (int) (value
& 65535));
2431 /* The first one sets the rest of the bits to 0, the next
2432 ones add set bits. */
2434 line_begin
= "\n\t";
2443 fprintf (stream
, "\n");
2446 /* Return 1 if value is 0..65535*2**(16*N) for N=0..3.
2450 mmix_shiftable_wyde_value (uint64_t value
)
2452 /* Shift by 16 bits per group, stop when we've found two groups with
2455 int has_candidate
= 0;
2457 for (i
= 0; i
< 4; i
++)
2473 /* X and Y are two things to compare using CODE. Return the rtx for
2474 the cc-reg in the proper mode. */
2477 mmix_gen_compare_reg (RTX_CODE code
, rtx x
, rtx y
)
2479 machine_mode ccmode
= SELECT_CC_MODE (code
, x
, y
);
2480 return gen_reg_rtx (ccmode
);
2483 /* Local (static) helper functions. */
2486 mmix_emit_sp_add (HOST_WIDE_INT offset
)
2492 /* Negative stack-pointer adjustments are allocations and appear in
2493 the prologue only. We mark them as frame-related so unwind and
2494 debug info is properly emitted for them. */
2496 insn
= emit_insn (gen_adddi3 (stack_pointer_rtx
,
2501 rtx tmpr
= gen_rtx_REG (DImode
, 255);
2502 RTX_FRAME_RELATED_P (emit_move_insn (tmpr
, GEN_INT (offset
))) = 1;
2503 insn
= emit_insn (gen_adddi3 (stack_pointer_rtx
,
2504 stack_pointer_rtx
, tmpr
));
2506 RTX_FRAME_RELATED_P (insn
) = 1;
2510 /* Positive adjustments are in the epilogue only. Don't mark them
2511 as "frame-related" for unwind info. */
2512 if (insn_const_int_ok_for_constraint (offset
, CONSTRAINT_L
))
2513 emit_insn (gen_adddi3 (stack_pointer_rtx
,
2518 rtx tmpr
= gen_rtx_REG (DImode
, 255);
2519 emit_move_insn (tmpr
, GEN_INT (offset
));
2520 insn
= emit_insn (gen_adddi3 (stack_pointer_rtx
,
2521 stack_pointer_rtx
, tmpr
));
2526 /* Print operator suitable for doing something with a shiftable
2527 wyde. The type of operator is passed as an asm output modifier. */
2530 mmix_output_shiftvalue_op_from_str (FILE *stream
,
2534 static const char *const op_part
[] = {"L", "ML", "MH", "H"};
2537 if (! mmix_shiftable_wyde_value (value
))
2539 char s
[sizeof ("0xffffffffffffffff")];
2540 sprintf (s
, "%#" PRIx64
, value
);
2541 internal_error ("MMIX Internal: %s is not a shiftable int", s
);
2544 for (i
= 0; i
< 4; i
++)
2546 /* We know we're through when we find one-bits in the low
2550 fprintf (stream
, "%s%s", mainop
, op_part
[i
]);
2556 /* No bits set? Then it must have been zero. */
2557 fprintf (stream
, "%sL", mainop
);
2560 /* Print a 64-bit value, optionally prefixed by assembly pseudo. */
2563 mmix_output_octa (FILE *stream
, int64_t value
, int do_begin_end
)
2566 fprintf (stream
, "\tOCTA ");
2568 /* Provide a few alternative output formats depending on the number, to
2569 improve legibility of assembler output. */
2570 if ((value
< (int64_t) 0 && value
> (int64_t) -10000)
2571 || (value
>= (int64_t) 0 && value
<= (int64_t) 16384))
2572 fprintf (stream
, "%d", (int) value
);
2573 else if (value
> (int64_t) 0
2574 && value
< ((int64_t) 1 << 31) * 2)
2575 fprintf (stream
, "#%x", (unsigned int) value
);
2576 else if (sizeof (HOST_WIDE_INT
) == sizeof (int64_t))
2577 /* We need to avoid the not-so-universal "0x" prefix; we need the
2578 pure hex-digits together with the mmixal "#" hex prefix. */
2579 fprintf (stream
, "#" HOST_WIDE_INT_PRINT_HEX_PURE
,
2580 (HOST_WIDE_INT
) value
);
2581 else /* Need to avoid the hex output; there's no ...WIDEST...HEX_PURE. */
2582 fprintf (stream
, "%" PRIu64
, value
);
2585 fprintf (stream
, "\n");
2588 /* Print the presumed shiftable wyde argument shifted into place (to
2589 be output with an operand). */
2592 mmix_output_shifted_value (FILE *stream
, int64_t value
)
2596 if (! mmix_shiftable_wyde_value (value
))
2599 sprintf (s
, "%#" PRIx64
, value
);
2600 internal_error ("MMIX Internal: %s is not a shiftable int", s
);
2603 for (i
= 0; i
< 4; i
++)
2605 /* We know we're through when we find one-bits in the low 16 bits. */
2608 fprintf (stream
, "#%x", (int) (value
& 0xffff));
2615 /* No bits set? Then it must have been zero. */
2616 fprintf (stream
, "0");
2619 /* Output an MMIX condition name corresponding to an operator
2621 (comparison_operator [(comparison_operator ...) (const_int 0)])
2622 which means we have to look at *two* operators.
2624 The argument "reversed" refers to reversal of the condition (not the
2625 same as swapping the arguments). */
2628 mmix_output_condition (FILE *stream
, const_rtx x
, int reversed
)
2634 /* The normal output cc-code. */
2635 const char *const normal
;
2637 /* The reversed cc-code, or NULL if invalid. */
2638 const char *const reversed
;
2643 machine_mode cc_mode
;
2645 /* Terminated with {UNKNOWN, NULL, NULL} */
2646 const struct cc_conv
*const convs
;
2650 #define CCEND {UNKNOWN, NULL, NULL}
2652 static const struct cc_conv cc_fun_convs
[]
2653 = {{ORDERED
, "Z", "P"},
2654 {UNORDERED
, "P", "Z"},
2656 static const struct cc_conv cc_fp_convs
[]
2660 static const struct cc_conv cc_fpeq_convs
[]
2664 static const struct cc_conv cc_uns_convs
[]
2665 = {{GEU
, "NN", "N"},
2670 static const struct cc_conv cc_signed_convs
[]
2678 static const struct cc_conv cc_di_convs
[]
2690 static const struct cc_type_conv cc_convs
[]
2691 = {{E_CC_FUNmode
, cc_fun_convs
},
2692 {E_CC_FPmode
, cc_fp_convs
},
2693 {E_CC_FPEQmode
, cc_fpeq_convs
},
2694 {E_CC_UNSmode
, cc_uns_convs
},
2695 {E_CCmode
, cc_signed_convs
},
2696 {E_DImode
, cc_di_convs
}};
2701 machine_mode mode
= GET_MODE (XEXP (x
, 0));
2702 RTX_CODE cc
= GET_CODE (x
);
2704 for (i
= 0; i
< ARRAY_SIZE (cc_convs
); i
++)
2706 if (mode
== cc_convs
[i
].cc_mode
)
2708 for (j
= 0; cc_convs
[i
].convs
[j
].cc
!= UNKNOWN
; j
++)
2709 if (cc
== cc_convs
[i
].convs
[j
].cc
)
2712 = (reversed
? cc_convs
[i
].convs
[j
].reversed
2713 : cc_convs
[i
].convs
[j
].normal
);
2715 if (mmix_cc
== NULL
)
2716 fatal_insn ("MMIX Internal: Trying to output invalidly\
2717 reversed condition:", x
);
2719 fprintf (stream
, "%s", mmix_cc
);
2723 fatal_insn ("MMIX Internal: What's the CC of this?", x
);
2727 fatal_insn ("MMIX Internal: What is the CC of this?", x
);
2730 /* Return the bit-value for a const_int or const_double. */
2733 mmix_intval (const_rtx x
)
2735 if (GET_CODE (x
) == CONST_INT
)
2738 /* We make a little song and dance because converting to long long in
2739 gcc-2.7.2 is broken. I still want people to be able to use it for
2740 cross-compilation to MMIX. */
2741 if (GET_CODE (x
) == CONST_DOUBLE
&& GET_MODE (x
) == VOIDmode
)
2742 return CONST_DOUBLE_HIGH (x
);
2744 if (GET_CODE (x
) == CONST_DOUBLE
)
2746 if (GET_MODE (x
) == DFmode
)
2750 REAL_VALUE_TO_TARGET_DOUBLE (*CONST_DOUBLE_REAL_VALUE (x
), bits
);
2752 /* The double cast is necessary to avoid getting the long
2753 sign-extended to unsigned long long(!) when they're of
2754 different size (usually 32-bit hosts). */
2756 ((uint64_t) (unsigned long) bits
[0]
2758 | (uint64_t) (unsigned long) bits
[1];
2760 else if (GET_MODE (x
) == SFmode
)
2763 REAL_VALUE_TO_TARGET_SINGLE (*CONST_DOUBLE_REAL_VALUE (x
), bits
);
2765 return (unsigned long) bits
;
2769 fatal_insn ("MMIX Internal: This is not a constant:", x
);
2772 /* Worker function for TARGET_PROMOTE_FUNCTION_MODE. */
2775 mmix_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
2777 int *punsignedp ATTRIBUTE_UNUSED
,
2778 const_tree fntype ATTRIBUTE_UNUSED
,
2781 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps
2782 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */
2783 if (for_return
== 1)
2786 /* Promotion of modes currently generates slow code, extending before
2787 operation, so we do it only for arguments. */
2788 if (GET_MODE_CLASS (mode
) == MODE_INT
2789 && GET_MODE_SIZE (mode
) < 8)
2794 /* Worker function for TARGET_STRUCT_VALUE_RTX. */
2797 mmix_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED
,
2798 int incoming ATTRIBUTE_UNUSED
)
2800 return gen_rtx_REG (Pmode
, MMIX_STRUCT_VALUE_REGNUM
);
2803 /* Worker function for TARGET_FRAME_POINTER_REQUIRED.
2805 FIXME: Is this requirement built-in? Anyway, we should try to get rid
2806 of it; we can deduce the value. */
2809 mmix_frame_pointer_required (void)
2811 return (cfun
->has_nonlocal_label
);
2816 * eval: (c-set-style "gnu")
2817 * indent-tabs-mode: t