sparc.c (emit_and_preserve): Allocate space for the register save area.

	* config/sparc/sparc.c (emit_and_preserve): Allocate space for the
	register save area.

Co-Authored-By: Eric Botcazou <ebotcazou@libertysurf.fr>
From-SVN: r112952

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 970a21dd22b709a960be81dee1cefa9b9daac858..5e47265ac29551581e461314443eceb613cd40aa 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2006-04-14  Alexey Starovoytov  <alexey.starovoytov@sun.com>
+            Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+       * config/sparc/sparc.c (emit_and_preserve): Allocate space for the
+       register save area.
+
 2006-04-10  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
        * doc/install.texi (*-*-solaris2*): Point to the configure page.

diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index c80b04efecca1547077159078f4ed2488f5eeb75..8e63d51e75bd3c510d0439249499e93d02445edc 100644 (file)
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -8905,16 +8905,24 @@ sparc_rtx_costs (rtx x, int code, int outer_code, int *total)
     }
 }
 
-/* Emit the sequence of insns SEQ while preserving the registers.  */
+/* Emit the sequence of insns SEQ while preserving the registers REG and REG2.
+   This is achieved by means of a manual dynamic stack space allocation in
+   the current frame.  We make the assumption that SEQ doesn't contain any
+   function calls, with the possible exception of calls to the PIC helper.  */
 
 static void
 emit_and_preserve (rtx seq, rtx reg, rtx reg2)
 {
-  /* STACK_BOUNDARY guarantees that this is a 2-word slot.  */
-  rtx slot = gen_rtx_MEM (word_mode,
-                         plus_constant (stack_pointer_rtx, SPARC_STACK_BIAS));
+  /* We must preserve the lowest 16 words for the register save area.  */
+  HOST_WIDE_INT offset = 16*UNITS_PER_WORD;
+  /* We really need only 2 words of fresh stack space.  */
+  HOST_WIDE_INT size = SPARC_STACK_ALIGN (offset + 2*UNITS_PER_WORD);
 
-  emit_insn (gen_stack_pointer_dec (GEN_INT (STACK_BOUNDARY/BITS_PER_UNIT)));
+  rtx slot
+    = gen_rtx_MEM (word_mode, plus_constant (stack_pointer_rtx,
+                                            SPARC_STACK_BIAS + offset));
+
+  emit_insn (gen_stack_pointer_dec (GEN_INT (size)));
   emit_insn (gen_rtx_SET (VOIDmode, slot, reg));
   if (reg2)
     emit_insn (gen_rtx_SET (VOIDmode,
@@ -8926,7 +8934,7 @@ emit_and_preserve (rtx seq, rtx reg, rtx reg2)
                            reg2,
                            adjust_address (slot, word_mode, UNITS_PER_WORD)));
   emit_insn (gen_rtx_SET (VOIDmode, reg, slot));
-  emit_insn (gen_stack_pointer_inc (GEN_INT (STACK_BOUNDARY/BITS_PER_UNIT)));
+  emit_insn (gen_stack_pointer_inc (GEN_INT (size)));
 }
 
 /* Output the assembler code for a thunk function.  THUNK_DECL is the