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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-06-18 06:37:45 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-06-18 06:37:45 -0400 |
| commit | 9cc96794cc35d136c2b229c636c1495fac1d12ab (patch) | |
| tree | d2022f40d0d93b918ae2715139f5c04ca26b7630 /gcc | |
| parent | 0b04ec8c2190fe80e0799c61f42549a6194e3979 (diff) | |
| download | gcc-9cc96794cc35d136c2b229c636c1495fac1d12ab.zip gcc-9cc96794cc35d136c2b229c636c1495fac1d12ab.tar.gz gcc-9cc96794cc35d136c2b229c636c1495fac1d12ab.tar.bz2 | |
(try_combine): Don't use split if dest of new I2 is used between I2
and I3.
From-SVN: r12293
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 9427060..3dbdb18 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1802,9 +1802,12 @@ try_combine (i3, i2, i1) &i2_scratches); /* If I2 or I3 has multiple SETs, we won't know how to track - register status, so don't use these insns. */ + register status, so don't use these insns. If I2's destination + is used between I2 and I3, we also can't use these insns. */ - if (i2_code_number >= 0 && i2set && i3set) + if (i2_code_number >= 0 && i2set && i3set + && (next_real_insn (i2) == i3 + || ! reg_used_between_p (SET_DEST (i2set), i2, i3))) insn_code_number = recog_for_combine (&newi3pat, i3, &new_i3_notes, &i3_scratches); if (insn_code_number >= 0) |