[thirdparty/gcc.git] / gcc / config / riscv / riscv-builtins.cc

/* Subroutines used for expanding RISC-V builtins.
   Copyright (C) 2011-2023 Free Software Foundation, Inc.
   Contributed by Andrew Waterman (andrew@sifive.com).

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#define IN_TARGET_CODE 1

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "gimple-expr.h"
#include "memmodel.h"
#include "expmed.h"
#include "profile-count.h"
#include "optabs.h"
#include "recog.h"
#include "diagnostic-core.h"
#include "stor-layout.h"
#include "stringpool.h"
#include "expr.h"
#include "langhooks.h"
#include "tm_p.h"

/* Macros to create an enumeration identifier for a function prototype.  */
#define RISCV_FTYPE_NAME0(A) RISCV_##A##_FTYPE
#define RISCV_FTYPE_NAME1(A, B) RISCV_##A##_FTYPE_##B
#define RISCV_FTYPE_NAME2(A, B, C) RISCV_##A##_FTYPE_##B##_##C
#define RISCV_FTYPE_NAME3(A, B, C, D) RISCV_##A##_FTYPE_##B##_##C##_##D

/* Classifies the prototype of a built-in function.  */
enum riscv_function_type {
#define DEF_RISCV_FTYPE(NARGS, LIST) RISCV_FTYPE_NAME##NARGS LIST,
#include "config/riscv/riscv-ftypes.def"
#undef DEF_RISCV_FTYPE
  RISCV_MAX_FTYPE_MAX
};

/* Specifies how a built-in function should be converted into rtl.  */
enum riscv_builtin_type {
  /* The function corresponds directly to an .md pattern.  */
  RISCV_BUILTIN_DIRECT,

  /* Likewise, but with return type VOID.  */
  RISCV_BUILTIN_DIRECT_NO_TARGET
};

/* Declare an availability predicate for built-in functions.  */
#define AVAIL(NAME, COND)		\
 static unsigned int			\
 riscv_builtin_avail_##NAME (void)	\
 {					\
   return (COND);			\
 }

/* This structure describes a single built-in function.  */
struct riscv_builtin_description {
  /* The code of the main .md file instruction.  See riscv_builtin_type
     for more information.  */
  enum insn_code icode;

  /* The name of the built-in function.  */
  const char *name;

  /* Specifies how the function should be expanded.  */
  enum riscv_builtin_type builtin_type;

  /* The function's prototype.  */
  enum riscv_function_type prototype;

  /* Whether the function is available.  */
  unsigned int (*avail) (void);
};

AVAIL (hard_float, TARGET_HARD_FLOAT || TARGET_ZFINX)
AVAIL (clean32, TARGET_ZICBOM && !TARGET_64BIT)
AVAIL (clean64, TARGET_ZICBOM && TARGET_64BIT)
AVAIL (flush32, TARGET_ZICBOM && !TARGET_64BIT)
AVAIL (flush64, TARGET_ZICBOM && TARGET_64BIT)
AVAIL (inval32, TARGET_ZICBOM && !TARGET_64BIT)
AVAIL (inval64, TARGET_ZICBOM && TARGET_64BIT)
AVAIL (zero32,  TARGET_ZICBOZ && !TARGET_64BIT)
AVAIL (zero64,  TARGET_ZICBOZ && TARGET_64BIT)
AVAIL (prefetchi32, TARGET_ZICBOP && !TARGET_64BIT)
AVAIL (prefetchi64, TARGET_ZICBOP && TARGET_64BIT)
AVAIL (always,     (!0))

/* Construct a riscv_builtin_description from the given arguments.

   INSN is the name of the associated instruction pattern, without the
   leading CODE_FOR_riscv_.

   NAME is the name of the function itself, without the leading
   "__builtin_riscv_".

   BUILTIN_TYPE and FUNCTION_TYPE are riscv_builtin_description fields.

   AVAIL is the name of the availability predicate, without the leading
   riscv_builtin_avail_.  */
#define RISCV_BUILTIN(INSN, NAME, BUILTIN_TYPE,	FUNCTION_TYPE, AVAIL)	\
  { CODE_FOR_riscv_ ## INSN, "__builtin_riscv_" NAME,			\
    BUILTIN_TYPE, FUNCTION_TYPE, riscv_builtin_avail_ ## AVAIL }

/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT function
   mapped to instruction CODE_FOR_riscv_<INSN>,  FUNCTION_TYPE and AVAIL
   are as for RISCV_BUILTIN.  */
#define DIRECT_BUILTIN(INSN, FUNCTION_TYPE, AVAIL)			\
  RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT, FUNCTION_TYPE, AVAIL)

/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT_NO_TARGET
   function mapped to instruction CODE_FOR_riscv_<INSN>,  FUNCTION_TYPE
   and AVAIL are as for RISCV_BUILTIN.  */
#define DIRECT_NO_TARGET_BUILTIN(INSN, FUNCTION_TYPE, AVAIL)		\
  RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT_NO_TARGET,		\
		FUNCTION_TYPE, AVAIL)

/* Argument types.  */
#define RISCV_ATYPE_VOID void_type_node
#define RISCV_ATYPE_USI unsigned_intSI_type_node
#define RISCV_ATYPE_QI intQI_type_node
#define RISCV_ATYPE_HI intHI_type_node
#define RISCV_ATYPE_SI intSI_type_node
#define RISCV_ATYPE_DI intDI_type_node
#define RISCV_ATYPE_VOID_PTR ptr_type_node

/* RISCV_FTYPE_ATYPESN takes N RISCV_FTYPES-like type codes and lists
   their associated RISCV_ATYPEs.  */
#define RISCV_FTYPE_ATYPES0(A) \
  RISCV_ATYPE_##A
#define RISCV_FTYPE_ATYPES1(A, B) \
  RISCV_ATYPE_##A, RISCV_ATYPE_##B
#define RISCV_FTYPE_ATYPES2(A, B, C) \
  RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C
#define RISCV_FTYPE_ATYPES3(A, B, C, D) \
  RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C, RISCV_ATYPE_##D

static const struct riscv_builtin_description riscv_builtins[] = {
  #include "riscv-cmo.def"

  DIRECT_BUILTIN (frflags, RISCV_USI_FTYPE, hard_float),
  DIRECT_NO_TARGET_BUILTIN (fsflags, RISCV_VOID_FTYPE_USI, hard_float),
  DIRECT_NO_TARGET_BUILTIN (pause, RISCV_VOID_FTYPE, always),
};

/* Index I is the function declaration for riscv_builtins[I], or null if the
   function isn't defined on this target.  */
static GTY(()) tree riscv_builtin_decls[ARRAY_SIZE (riscv_builtins)];

/* Get the index I of the function declaration for riscv_builtin_decls[I]
   using the instruction code or return null if not defined for the target.  */
static GTY(()) int riscv_builtin_decl_index[NUM_INSN_CODES];

#define GET_BUILTIN_DECL(CODE) \
  riscv_builtin_decls[riscv_builtin_decl_index[(CODE)]]

tree riscv_float16_type_node = NULL_TREE;

/* Return the function type associated with function prototype TYPE.  */

static tree
riscv_build_function_type (enum riscv_function_type type)
{
  static tree types[(int) RISCV_MAX_FTYPE_MAX];

  if (types[(int) type] == NULL_TREE)
    switch (type)
      {
#define DEF_RISCV_FTYPE(NUM, ARGS)					\
  case RISCV_FTYPE_NAME##NUM ARGS:					\
    types[(int) type]							\
      = build_function_type_list (RISCV_FTYPE_ATYPES##NUM ARGS,		\
				  NULL_TREE);				\
    break;
#include "config/riscv/riscv-ftypes.def"
#undef DEF_RISCV_FTYPE
      default:
	gcc_unreachable ();
      }

  return types[(int) type];
}

static void
riscv_init_builtin_types (void)
{
  /* Provide the _Float16 type and float16_type_node if needed.  */
  if (!float16_type_node)
    {
      riscv_float16_type_node = make_node (REAL_TYPE);
      TYPE_PRECISION (riscv_float16_type_node) = 16;
      SET_TYPE_MODE (riscv_float16_type_node, HFmode);
      layout_type (riscv_float16_type_node);
    }
  else
    riscv_float16_type_node = float16_type_node;

  if (!maybe_get_identifier ("_Float16"))
    lang_hooks.types.register_builtin_type (riscv_float16_type_node,
					    "_Float16");
}

/* Implement TARGET_INIT_BUILTINS.  */

void
riscv_init_builtins (void)
{
  riscv_init_builtin_types ();
  riscv_vector::init_builtins ();

  for (size_t i = 0; i < ARRAY_SIZE (riscv_builtins); i++)
    {
      const struct riscv_builtin_description *d = &riscv_builtins[i];
      if (d->avail ())
	{
	  tree type = riscv_build_function_type (d->prototype);
	  riscv_builtin_decls[i]
	    = add_builtin_function (d->name, type,
				    (i << RISCV_BUILTIN_SHIFT)
				      + RISCV_BUILTIN_GENERAL,
				    BUILT_IN_MD, NULL, NULL);
	  riscv_builtin_decl_index[d->icode] = i;
	}
    }
}

/* Implement TARGET_BUILTIN_DECL.  */

tree
riscv_builtin_decl (unsigned int code, bool initialize_p ATTRIBUTE_UNUSED)
{
  unsigned int subcode = code >> RISCV_BUILTIN_SHIFT;
  switch (code & RISCV_BUILTIN_CLASS)
    {
    case RISCV_BUILTIN_GENERAL:
      if (subcode >= ARRAY_SIZE (riscv_builtins))
	return error_mark_node;
      return riscv_builtin_decls[subcode];

    case RISCV_BUILTIN_VECTOR:
      return riscv_vector::builtin_decl (subcode, initialize_p);
    }
  return error_mark_node;
}

/* Take argument ARGNO from EXP's argument list and convert it into
   an expand operand.  Store the operand in *OP.  */

static void
riscv_prepare_builtin_arg (struct expand_operand *op, tree exp, unsigned argno)
{
  tree arg = CALL_EXPR_ARG (exp, argno);
  create_input_operand (op, expand_normal (arg), TYPE_MODE (TREE_TYPE (arg)));
}

/* Expand instruction ICODE as part of a built-in function sequence.
   Use the first NOPS elements of OPS as the instruction's operands.
   HAS_TARGET_P is true if operand 0 is a target; it is false if the
   instruction has no target.

   Return the target rtx if HAS_TARGET_P, otherwise return const0_rtx.  */

static rtx
riscv_expand_builtin_insn (enum insn_code icode, unsigned int n_ops,
			   struct expand_operand *ops, bool has_target_p)
{
  if (!maybe_expand_insn (icode, n_ops, ops))
    {
      error ("invalid argument to built-in function");
      return has_target_p ? gen_reg_rtx (ops[0].mode) : const0_rtx;
    }

  return has_target_p ? ops[0].value : const0_rtx;
}

/* Expand a RISCV_BUILTIN_DIRECT or RISCV_BUILTIN_DIRECT_NO_TARGET function;
   HAS_TARGET_P says which.  EXP is the CALL_EXPR that calls the function
   and ICODE is the code of the associated .md pattern.  TARGET, if nonnull,
   suggests a good place to put the result.  */

static rtx
riscv_expand_builtin_direct (enum insn_code icode, rtx target, tree exp,
			     bool has_target_p)
{
  struct expand_operand ops[MAX_RECOG_OPERANDS];

  /* Map any target to operand 0.  */
  int opno = 0;
  if (has_target_p)
    create_output_operand (&ops[opno++], target, TYPE_MODE (TREE_TYPE (exp)));

  /* Map the arguments to the other operands.  */
  gcc_assert (opno + call_expr_nargs (exp)
	      == insn_data[icode].n_generator_args);
  for (int argno = 0; argno < call_expr_nargs (exp); argno++)
    riscv_prepare_builtin_arg (&ops[opno++], exp, argno);

  return riscv_expand_builtin_insn (icode, opno, ops, has_target_p);
}

/* Implement TARGET_EXPAND_BUILTIN.  */

rtx
riscv_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
		      machine_mode mode ATTRIBUTE_UNUSED,
		      int ignore ATTRIBUTE_UNUSED)
{
  tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
  unsigned int fcode = DECL_MD_FUNCTION_CODE (fndecl);
  unsigned int subcode = fcode >> RISCV_BUILTIN_SHIFT;
  switch (fcode & RISCV_BUILTIN_CLASS)
    {
      case RISCV_BUILTIN_VECTOR:
	return riscv_vector::expand_builtin (subcode, exp, target);
      case RISCV_BUILTIN_GENERAL: {
	const struct riscv_builtin_description *d = &riscv_builtins[subcode];

	switch (d->builtin_type)
	  {
	  case RISCV_BUILTIN_DIRECT:
	    return riscv_expand_builtin_direct (d->icode, target, exp, true);

	  case RISCV_BUILTIN_DIRECT_NO_TARGET:
	    return riscv_expand_builtin_direct (d->icode, target, exp, false);
	  }
      }
    }

  gcc_unreachable ();
}

/* Implement TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */

void
riscv_atomic_assign_expand_fenv (tree *hold, tree *clear, tree *update)
{
  if (!(TARGET_HARD_FLOAT || TARGET_ZFINX))
    return;

  tree frflags = GET_BUILTIN_DECL (CODE_FOR_riscv_frflags);
  tree fsflags = GET_BUILTIN_DECL (CODE_FOR_riscv_fsflags);
  tree old_flags = create_tmp_var_raw (RISCV_ATYPE_USI);

  *hold = build4 (TARGET_EXPR, RISCV_ATYPE_USI, old_flags,
		  build_call_expr (frflags, 0), NULL_TREE, NULL_TREE);
  *clear = build_call_expr (fsflags, 1, old_flags);
  *update = NULL_TREE;
}
Commit	Line	Data
09cae750	1	/* Subroutines used for expanding RISC-V builtins.
83ffe9cd	2	Copyright (C) 2011-2023 Free Software Foundation, Inc.
09cae750 PD	3	Contributed by Andrew Waterman (andrew@sifive.com).
	4
	5	This file is part of GCC.
	6
	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)
	10	any later version.
	11
	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.
	16
	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/>. */
	20
8fcc61f8 RS	21	#define IN_TARGET_CODE 1
8fcc61f8 RS	22
09cae750 PD	23	#include "config.h"
	24	#include "system.h"
	25	#include "coretypes.h"
	26	#include "tm.h"
	27	#include "rtl.h"
	28	#include "tree.h"
	29	#include "gimple-expr.h"
	30	#include "memmodel.h"
	31	#include "expmed.h"
1b68a156	32	#include "profile-count.h"
09cae750 PD	33	#include "optabs.h"
	34	#include "recog.h"
	35	#include "diagnostic-core.h"
	36	#include "stor-layout.h"
27d68a60	37	#include "stringpool.h"
09cae750 PD	38	#include "expr.h"
09cae750 PD	39	#include "langhooks.h"
7d935cdd	40	#include "tm_p.h"
09cae750 PD	41
09cae750 PD	42	/* Macros to create an enumeration identifier for a function prototype. */
33d9794b	43	#define RISCV_FTYPE_NAME0(A) RISCV_##A##_FTYPE
09cae750	44	#define RISCV_FTYPE_NAME1(A, B) RISCV_##A##_FTYPE_##B
89456334 LS	45	#define RISCV_FTYPE_NAME2(A, B, C) RISCV_##A##_FTYPE_##B##_##C
89456334 LS	46	#define RISCV_FTYPE_NAME3(A, B, C, D) RISCV_##A##_FTYPE_##B##_##C##_##D
09cae750 PD	47
	48	/* Classifies the prototype of a built-in function. */
	49	enum riscv_function_type {
	50	#define DEF_RISCV_FTYPE(NARGS, LIST) RISCV_FTYPE_NAME##NARGS LIST,
	51	#include "config/riscv/riscv-ftypes.def"
	52	#undef DEF_RISCV_FTYPE
	53	RISCV_MAX_FTYPE_MAX
	54	};
	55
	56	/* Specifies how a built-in function should be converted into rtl. */
	57	enum riscv_builtin_type {
	58	/* The function corresponds directly to an .md pattern. */
	59	RISCV_BUILTIN_DIRECT,
	60
	61	/* Likewise, but with return type VOID. */
	62	RISCV_BUILTIN_DIRECT_NO_TARGET
	63	};
	64
	65	/* Declare an availability predicate for built-in functions. */
	66	#define AVAIL(NAME, COND) \
	67	static unsigned int \
	68	riscv_builtin_avail_##NAME (void) \
	69	{ \
	70	return (COND); \
	71	}
	72
	73	/* This structure describes a single built-in function. */
	74	struct riscv_builtin_description {
	75	/* The code of the main .md file instruction. See riscv_builtin_type
	76	for more information. */
	77	enum insn_code icode;
	78
	79	/* The name of the built-in function. */
	80	const char *name;
	81
	82	/* Specifies how the function should be expanded. */
	83	enum riscv_builtin_type builtin_type;
	84
	85	/* The function's prototype. */
	86	enum riscv_function_type prototype;
	87
	88	/* Whether the function is available. */
	89	unsigned int (*avail) (void);
	90	};
	91
ac96e906	92	AVAIL (hard_float, TARGET_HARD_FLOAT \|\| TARGET_ZFINX)
3df3ca90 S	93	AVAIL (clean32, TARGET_ZICBOM && !TARGET_64BIT)
	94	AVAIL (clean64, TARGET_ZICBOM && TARGET_64BIT)
	95	AVAIL (flush32, TARGET_ZICBOM && !TARGET_64BIT)
	96	AVAIL (flush64, TARGET_ZICBOM && TARGET_64BIT)
	97	AVAIL (inval32, TARGET_ZICBOM && !TARGET_64BIT)
	98	AVAIL (inval64, TARGET_ZICBOM && TARGET_64BIT)
	99	AVAIL (zero32, TARGET_ZICBOZ && !TARGET_64BIT)
	100	AVAIL (zero64, TARGET_ZICBOZ && TARGET_64BIT)
	101	AVAIL (prefetchi32, TARGET_ZICBOP && !TARGET_64BIT)
	102	AVAIL (prefetchi64, TARGET_ZICBOP && TARGET_64BIT)
c717a92d	103	AVAIL (always, (!0))
3df3ca90	104
09cae750 PD	105	/* Construct a riscv_builtin_description from the given arguments.
	106
	107	INSN is the name of the associated instruction pattern, without the
	108	leading CODE_FOR_riscv_.
	109
	110	NAME is the name of the function itself, without the leading
	111	"__builtin_riscv_".
	112
	113	BUILTIN_TYPE and FUNCTION_TYPE are riscv_builtin_description fields.
	114
	115	AVAIL is the name of the availability predicate, without the leading
	116	riscv_builtin_avail_. */
	117	#define RISCV_BUILTIN(INSN, NAME, BUILTIN_TYPE, FUNCTION_TYPE, AVAIL) \
	118	{ CODE_FOR_riscv_ ## INSN, "__builtin_riscv_" NAME, \
	119	BUILTIN_TYPE, FUNCTION_TYPE, riscv_builtin_avail_ ## AVAIL }
	120
	121	/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT function
	122	mapped to instruction CODE_FOR_riscv_<INSN>, FUNCTION_TYPE and AVAIL
	123	are as for RISCV_BUILTIN. */
	124	#define DIRECT_BUILTIN(INSN, FUNCTION_TYPE, AVAIL) \
	125	RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT, FUNCTION_TYPE, AVAIL)
	126
	127	/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT_NO_TARGET
	128	function mapped to instruction CODE_FOR_riscv_<INSN>, FUNCTION_TYPE
	129	and AVAIL are as for RISCV_BUILTIN. */
	130	#define DIRECT_NO_TARGET_BUILTIN(INSN, FUNCTION_TYPE, AVAIL) \
	131	RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT_NO_TARGET, \
	132	FUNCTION_TYPE, AVAIL)
	133
	134	/* Argument types. */
	135	#define RISCV_ATYPE_VOID void_type_node
	136	#define RISCV_ATYPE_USI unsigned_intSI_type_node
89456334 LS	137	#define RISCV_ATYPE_QI intQI_type_node
89456334 LS	138	#define RISCV_ATYPE_HI intHI_type_node
3df3ca90 S	139	#define RISCV_ATYPE_SI intSI_type_node
3df3ca90 S	140	#define RISCV_ATYPE_DI intDI_type_node
970b03c0	141	#define RISCV_ATYPE_VOID_PTR ptr_type_node
09cae750 PD	142
	143	/* RISCV_FTYPE_ATYPESN takes N RISCV_FTYPES-like type codes and lists
	144	their associated RISCV_ATYPEs. */
33d9794b KC	145	#define RISCV_FTYPE_ATYPES0(A) \
33d9794b KC	146	RISCV_ATYPE_##A
09cae750 PD	147	#define RISCV_FTYPE_ATYPES1(A, B) \
09cae750 PD	148	RISCV_ATYPE_##A, RISCV_ATYPE_##B
89456334 LS	149	#define RISCV_FTYPE_ATYPES2(A, B, C) \
	150	RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C
	151	#define RISCV_FTYPE_ATYPES3(A, B, C, D) \
	152	RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C, RISCV_ATYPE_##D
09cae750 PD	153
09cae750 PD	154	static const struct riscv_builtin_description riscv_builtins[] = {
3df3ca90 S	155	#include "riscv-cmo.def"
3df3ca90 S	156
33d9794b	157	DIRECT_BUILTIN (frflags, RISCV_USI_FTYPE, hard_float),
c717a92d PT	158	DIRECT_NO_TARGET_BUILTIN (fsflags, RISCV_VOID_FTYPE_USI, hard_float),
c717a92d PT	159	DIRECT_NO_TARGET_BUILTIN (pause, RISCV_VOID_FTYPE, always),
09cae750 PD	160	};
	161
	162	/* Index I is the function declaration for riscv_builtins[I], or null if the
	163	function isn't defined on this target. */
	164	static GTY(()) tree riscv_builtin_decls[ARRAY_SIZE (riscv_builtins)];
	165
	166	/* Get the index I of the function declaration for riscv_builtin_decls[I]
	167	using the instruction code or return null if not defined for the target. */
	168	static GTY(()) int riscv_builtin_decl_index[NUM_INSN_CODES];
	169
	170	#define GET_BUILTIN_DECL(CODE) \
	171	riscv_builtin_decls[riscv_builtin_decl_index[(CODE)]]
	172
27d68a60 KC	173	tree riscv_float16_type_node = NULL_TREE;
27d68a60 KC	174
09cae750 PD	175	/* Return the function type associated with function prototype TYPE. */
	176
	177	static tree
	178	riscv_build_function_type (enum riscv_function_type type)
	179	{
	180	static tree types[(int) RISCV_MAX_FTYPE_MAX];
	181
	182	if (types[(int) type] == NULL_TREE)
	183	switch (type)
	184	{
	185	#define DEF_RISCV_FTYPE(NUM, ARGS) \
	186	case RISCV_FTYPE_NAME##NUM ARGS: \
	187	types[(int) type] \
	188	= build_function_type_list (RISCV_FTYPE_ATYPES##NUM ARGS, \
	189	NULL_TREE); \
	190	break;
	191	#include "config/riscv/riscv-ftypes.def"
	192	#undef DEF_RISCV_FTYPE
	193	default:
	194	gcc_unreachable ();
	195	}
	196
	197	return types[(int) type];
	198	}
	199
27d68a60 KC	200	static void
	201	riscv_init_builtin_types (void)
	202	{
	203	/* Provide the _Float16 type and float16_type_node if needed. */
	204	if (!float16_type_node)
	205	{
	206	riscv_float16_type_node = make_node (REAL_TYPE);
	207	TYPE_PRECISION (riscv_float16_type_node) = 16;
	208	SET_TYPE_MODE (riscv_float16_type_node, HFmode);
	209	layout_type (riscv_float16_type_node);
	210	}
	211	else
	212	riscv_float16_type_node = float16_type_node;
	213
	214	if (!maybe_get_identifier ("_Float16"))
	215	lang_hooks.types.register_builtin_type (riscv_float16_type_node,
	216	"_Float16");
	217	}
	218
09cae750 PD	219	/* Implement TARGET_INIT_BUILTINS. */
	220
	221	void
	222	riscv_init_builtins (void)
	223	{
27d68a60	224	riscv_init_builtin_types ();
03f33657	225	riscv_vector::init_builtins ();
27d68a60	226
09cae750 PD	227	for (size_t i = 0; i < ARRAY_SIZE (riscv_builtins); i++)
	228	{
	229	const struct riscv_builtin_description *d = &riscv_builtins[i];
	230	if (d->avail ())
	231	{
	232	tree type = riscv_build_function_type (d->prototype);
	233	riscv_builtin_decls[i]
cbd50570 JZZ	234	= add_builtin_function (d->name, type,
	235	(i << RISCV_BUILTIN_SHIFT)
	236	+ RISCV_BUILTIN_GENERAL,
	237	BUILT_IN_MD, NULL, NULL);
09cae750 PD	238	riscv_builtin_decl_index[d->icode] = i;
	239	}
	240	}
	241	}
	242
	243	/* Implement TARGET_BUILTIN_DECL. */
	244
	245	tree
	246	riscv_builtin_decl (unsigned int code, bool initialize_p ATTRIBUTE_UNUSED)
	247	{
cbd50570 JZZ	248	unsigned int subcode = code >> RISCV_BUILTIN_SHIFT;
	249	switch (code & RISCV_BUILTIN_CLASS)
	250	{
	251	case RISCV_BUILTIN_GENERAL:
	252	if (subcode >= ARRAY_SIZE (riscv_builtins))
	253	return error_mark_node;
	254	return riscv_builtin_decls[subcode];
	255
	256	case RISCV_BUILTIN_VECTOR:
	257	return riscv_vector::builtin_decl (subcode, initialize_p);
	258	}
	259	return error_mark_node;
09cae750 PD	260	}
	261
	262	/* Take argument ARGNO from EXP's argument list and convert it into
	263	an expand operand. Store the operand in OP. /
	264
	265	static void
	266	riscv_prepare_builtin_arg (struct expand_operand *op, tree exp, unsigned argno)
	267	{
	268	tree arg = CALL_EXPR_ARG (exp, argno);
	269	create_input_operand (op, expand_normal (arg), TYPE_MODE (TREE_TYPE (arg)));
	270	}
	271
	272	/* Expand instruction ICODE as part of a built-in function sequence.
	273	Use the first NOPS elements of OPS as the instruction's operands.
	274	HAS_TARGET_P is true if operand 0 is a target; it is false if the
	275	instruction has no target.
	276
	277	Return the target rtx if HAS_TARGET_P, otherwise return const0_rtx. */
	278
	279	static rtx
	280	riscv_expand_builtin_insn (enum insn_code icode, unsigned int n_ops,
	281	struct expand_operand *ops, bool has_target_p)
	282	{
	283	if (!maybe_expand_insn (icode, n_ops, ops))
	284	{
	285	error ("invalid argument to built-in function");
	286	return has_target_p ? gen_reg_rtx (ops[0].mode) : const0_rtx;
	287	}
	288
	289	return has_target_p ? ops[0].value : const0_rtx;
	290	}
	291
	292	/* Expand a RISCV_BUILTIN_DIRECT or RISCV_BUILTIN_DIRECT_NO_TARGET function;
	293	HAS_TARGET_P says which. EXP is the CALL_EXPR that calls the function
	294	and ICODE is the code of the associated .md pattern. TARGET, if nonnull,
	295	suggests a good place to put the result. */
	296
	297	static rtx
	298	riscv_expand_builtin_direct (enum insn_code icode, rtx target, tree exp,
	299	bool has_target_p)
	300	{
	301	struct expand_operand ops[MAX_RECOG_OPERANDS];
	302
	303	/* Map any target to operand 0. */
	304	int opno = 0;
	305	if (has_target_p)
	306	create_output_operand (&ops[opno++], target, TYPE_MODE (TREE_TYPE (exp)));
	307
	308	/* Map the arguments to the other operands. */
	309	gcc_assert (opno + call_expr_nargs (exp)
	310	== insn_data[icode].n_generator_args);
	311	for (int argno = 0; argno < call_expr_nargs (exp); argno++)
	312	riscv_prepare_builtin_arg (&ops[opno++], exp, argno);
	313
	314	return riscv_expand_builtin_insn (icode, opno, ops, has_target_p);
	315	}
	316
	317	/* Implement TARGET_EXPAND_BUILTIN. */
	318
	319	rtx
	320	riscv_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
	321	machine_mode mode ATTRIBUTE_UNUSED,
	322	int ignore ATTRIBUTE_UNUSED)
	323	{
324	tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
4d732405	325	unsigned int fcode = DECL_MD_FUNCTION_CODE (fndecl);
cbd50570 JZZ	326	unsigned int subcode = fcode >> RISCV_BUILTIN_SHIFT;
cbd50570 JZZ	327	switch (fcode & RISCV_BUILTIN_CLASS)
09cae750	328	{
cbd50570 JZZ	329	case RISCV_BUILTIN_VECTOR:
	330	return riscv_vector::expand_builtin (subcode, exp, target);
	331	case RISCV_BUILTIN_GENERAL: {
	332	const struct riscv_builtin_description *d = &riscv_builtins[subcode];
	333
	334	switch (d->builtin_type)
	335	{
	336	case RISCV_BUILTIN_DIRECT:
	337	return riscv_expand_builtin_direct (d->icode, target, exp, true);
	338
	339	case RISCV_BUILTIN_DIRECT_NO_TARGET:
	340	return riscv_expand_builtin_direct (d->icode, target, exp, false);
	341	}
	342	}
09cae750 PD	343	}
	344
	345	gcc_unreachable ();
	346	}
	347
	348	/* Implement TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
	349
	350	void
	351	riscv_atomic_assign_expand_fenv (tree hold, tree clear, tree *update)
	352	{
ac96e906	353	if (!(TARGET_HARD_FLOAT \|\| TARGET_ZFINX))
09cae750 PD	354	return;
	355
	356	tree frflags = GET_BUILTIN_DECL (CODE_FOR_riscv_frflags);
	357	tree fsflags = GET_BUILTIN_DECL (CODE_FOR_riscv_fsflags);
	358	tree old_flags = create_tmp_var_raw (RISCV_ATYPE_USI);
	359
b4ace720 JJ	360	*hold = build4 (TARGET_EXPR, RISCV_ATYPE_USI, old_flags,
b4ace720 JJ	361	build_call_expr (frflags, 0), NULL_TREE, NULL_TREE);
09cae750 PD	362	*clear = build_call_expr (fsflags, 1, old_flags);
	363	*update = NULL_TREE;
	364	}