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| author | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-09-12 21:48:40 +0000 |
|---|---|---|
| committer | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-09-12 21:48:40 +0000 |
| commit | ac24e06b9b6b70609a00e8d2f0713a37877b0b08 (patch) | |
| tree | 80407237f314500d9bf114072032704bb1a93cba /gcc/combine.c | |
| parent | 38b03d4045019f2a5d7d3566f7daaa52383f768d (diff) | |
| download | gcc-ac24e06b9b6b70609a00e8d2f0713a37877b0b08.tar.gz | |
PR rtl-optimization/28243
* combine.c (distribute_notes) <REG_DEAD>: Do not consider SETs past
the insn to which the note was originally attached.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116906 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 0f4ea02970f..e85e9d1c477 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -12165,12 +12165,14 @@ distribute_notes (rtx notes, rtx from_insn, rtx i3, rtx i2, rtx elim_i2, continue; } - /* If the register is being set at TEM, see if that is all - TEM is doing. If so, delete TEM. Otherwise, make this - into a REG_UNUSED note instead. Don't delete sets to - global register vars. */ - if ((REGNO (XEXP (note, 0)) >= FIRST_PSEUDO_REGISTER - || !global_regs[REGNO (XEXP (note, 0))]) + /* If TEM is a (reaching) definition of the use to which the + note was attached, see if that is all TEM is doing. If so, + delete TEM. Otherwise, make this into a REG_UNUSED note + instead. Don't delete sets to global register vars. */ + if ((!from_insn + || INSN_CUID (tem) < INSN_CUID (from_insn)) + && (REGNO (XEXP (note, 0)) >= FIRST_PSEUDO_REGISTER + || !global_regs[REGNO (XEXP (note, 0))]) && reg_set_p (XEXP (note, 0), PATTERN (tem))) { rtx set = single_set (tem); |