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(output_move_qimode): Optimize pushing one byte if the source operand

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does not use the stack pointer.

From-SVN: r13891
This commit is contained in:
Richard Kenner 1997-04-13 15:15:21 -04:00
parent 5716e64528
commit 3879920c64
1 changed files with 11 additions and 1 deletions
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12
gcc/config/m68k/m68k.c
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@ -1508,7 +1508,17 @@ output_move_qimode (operands)
gen_rtx (PLUS, VOIDmode, stack_pointer_rtx, const1_rtx));
/* Just pushing a byte puts it in the high byte of the halfword. */
/* We must put it in the low-order, high-numbered byte. */
output_asm_insn ("move%.b %1,%-\n\tmove%.b %@,%2", xoperands);
if (!reg_mentioned_p (stack_pointer_rtx, operands[1]))
{
xoperands[3] = stack_pointer_rtx;
#ifndef NO_ADDSUB_Q
output_asm_insn ("subq%.l %#2,%3\n\tmove%.b %1,%2", xoperands);
#else
output_asm_insn ("sub%.l %#2,%3\n\tmove%.b %1,%2", xoperands);
#endif
}
else
output_asm_insn ("move%.b %1,%-\n\tmove%.b %@,%2", xoperands);
return "";
}