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| author | Alan Modra <amodra@bigpond.net.au> | 2005-11-15 00:59:21 +0000 |
|---|---|---|
| committer | Alan Modra <amodra@gcc.gnu.org> | 2005-11-15 11:29:21 +1030 |
| commit | 46de9b3caffed182eced14f567b27bb77630335f (patch) | |
| tree | fb1b5a7c58c0d92dea3fff32e17615973850ea40 /gcc/combine.c | |
| parent | 12431170a7501c25893590d93c876951081da6f9 (diff) | |
| download | gcc-46de9b3caffed182eced14f567b27bb77630335f.zip gcc-46de9b3caffed182eced14f567b27bb77630335f.tar.gz gcc-46de9b3caffed182eced14f567b27bb77630335f.tar.bz2 | |
re PR rtl-optimization/22002 (internal consistency failure with -funroll-loops)
PR rtl-optimization/22002
* combine.c (distribute_notes): Detect cases where a reg dies
two or more times in a bb, including on the insn we are combining,
and place the death note on the correct range.
From-SVN: r106921
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 82d260d..9f910a7 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -12232,6 +12232,10 @@ distribute_notes (rtx notes, rtx from_insn, rtx i3, rtx i2, rtx elim_i2, { basic_block bb = this_basic_block; + /* You might think you could search back from FROM_INSN + rather than from I3, but combine tries to split invalid + combined instructions. This can result in the old I2 + or I1 moving later in the insn sequence. */ for (tem = PREV_INSN (i3); place == 0; tem = PREV_INSN (tem)) { if (! INSN_P (tem)) @@ -12332,6 +12336,22 @@ distribute_notes (rtx notes, rtx from_insn, rtx i3, rtx i2, rtx elim_i2, || (CALL_P (tem) && find_reg_fusage (tem, USE, XEXP (note, 0)))) { + /* This may not be the correct place for the death + note if FROM_INSN is before TEM, and the reg is + set between FROM_INSN and TEM. The reg might + die two or more times. An existing death note + means we are looking at the wrong live range. */ + if (from_insn + && INSN_CUID (from_insn) < INSN_CUID (tem) + && find_regno_note (tem, REG_DEAD, + REGNO (XEXP (note, 0)))) + { + tem = from_insn; + if (tem == BB_HEAD (bb)) + break; + continue; + } + place = tem; /* If we are doing a 3->2 combination, and we have a |