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| author | Richard Kenner <kenner@gcc.gnu.org> | 1997-04-13 15:15:21 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1997-04-13 15:15:21 -0400 |
| commit | 3879920c646985bca78fc35a716c600a640173b6 (patch) | |
| tree | 3344a273468d434d8e51a42f4d4d4c0ff5d65527 /gcc | |
| parent | 5716e6452827c805240fbede43b6f82a4f6a914f (diff) | |
| download | gcc-3879920c646985bca78fc35a716c600a640173b6.zip gcc-3879920c646985bca78fc35a716c600a640173b6.tar.gz gcc-3879920c646985bca78fc35a716c600a640173b6.tar.bz2 | |
(output_move_qimode): Optimize pushing one byte if the source operand
does not use the stack pointer.
From-SVN: r13891
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/m68k/m68k.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c index 59b9315..f0c1714 100644 --- a/gcc/config/m68k/m68k.c +++ b/gcc/config/m68k/m68k.c @@ -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 ""; } |