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| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 9 |
2 files changed, 12 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e2821e3..ca4525c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 58e2633..dadd18d 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -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]); |