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* config/i386/i386.c (ix86_split_ashrdi): Optimize shift by 63. 

From-SVN: r79397
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Roger Sayle 2004-03-12 17:21:32 +00:00 committed by Roger Sayle
parent b8d5073947
commit 8937b6a209
2 changed files with 12 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2004-03-12 Roger Sayle <roger@eyesopen.com>
* config/i386/i386.c (ix86_split_ashrdi): Optimize shift by 63.
2004-03-12 Matt Austern <austern@apple.com>
* target.h (struct gcc_target): New target hook, unwind_label.

9
gcc/config/i386/i386.c
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@ -10873,7 +10873,14 @@ ix86_split_ashrdi (rtx *operands, rtx scratch)
split_di (operands, 2, low, high);
count = INTVAL (operands[2]) & 63;
if (count >= 32)
if (count == 63)
{
emit_move_insn (high[0], high[1]);
emit_insn (gen_ashrsi3 (high[0], high[0], GEN_INT (31)));
emit_move_insn (low[0], high[0]);
}
else if (count >= 32)
{
emit_move_insn (low[0], high[1]);