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({function,ix86_expand}_prologue): Use __alloca to allocate stack if 

desired and beyond CHECK_STACK_LIMIT in size.

From-SVN: r12709
This commit is contained in:
Richard Kenner 1996-09-14 17:02:23 -04:00
parent 578b58f55e
commit 8dfe5673a0
1 changed files with 29 additions and 7 deletions
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36
gcc/config/i386/i386.c
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@ -45,6 +45,10 @@ Boston, MA 02111-1307, USA. */
even if the conditional was untrue. */
#endif
#ifndef CHECK_STACK_LIMIT
#define CHECK_STACK_LIMIT -1
#endif
enum reg_mem /* Type of an operand for ix86_{binary,unary}_operator_ok */
{
reg_p,
@ -1742,14 +1746,25 @@ function_prologue (file, size)
xops[0] = stack_pointer_rtx;
xops[1] = frame_pointer_rtx;
xops[2] = GEN_INT (tsize);
if (frame_pointer_needed)
{
output_asm_insn ("push%L1 %1", xops);
output_asm_insn (AS2 (mov%L0,%0,%1), xops);
}
if (tsize)
if (tsize == 0)
;
else if (! TARGET_STACK_PROBE || tsize < CHECK_STACK_LIMIT)
output_asm_insn (AS2 (sub%L0,%2,%0), xops);
else
{
xops[3] = gen_rtx (REG, SImode, 0);
output_asm_insn (AS2 (mov%L0,%2,%3), xops);
xops[3] = gen_rtx (SYMBOL_REF, Pmode, "_alloca");
output_asm_insn (AS1 (call,%P3), xops);
}
/* Note If use enter it is NOT reversed args.
This one is not reversed from intel!!
@ -1820,12 +1835,19 @@ ix86_expand_prologue ()
emit_move_insn (xops[1], xops[0]);
}
if (tsize)
emit_insn (gen_rtx (SET, SImode,
xops[0],
gen_rtx (MINUS, SImode,
xops[0],
xops[2])));
if (tsize == 0)
;
else if (! TARGET_STACK_PROBE || tsize < CHECK_STACK_LIMIT)
emit_insn (gen_subsi3 (xops[0], xops[0], xops[2]));
else
{
xops[3] = gen_rtx (REG, SImode, 0);
emit_move_insn (xops[3], xops[2]);
xops[3] = gen_rtx (MEM, FUNCTION_MODE,
gen_rtx (SYMBOL_REF, Pmode, "_alloca"));
emit_call_insn (gen_rtx (CALL, VOIDmode,
xops[3], const0_rtx));
}
/* Note If use enter it is NOT reversed args.
This one is not reversed from intel!!