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[PeepholeOptimizer] Update the kill flags when extending the live-range of the
author
Quentin Colombet
<qcolombet@apple.com>
Thu, 21 Aug 2014 21:34:06 +0000
(21:34 +0000)
committer
Quentin Colombet
<qcolombet@apple.com>
Thu, 21 Aug 2014 21:34:06 +0000
(21:34 +0000)
source of a copy.
<rdar://problem/
12702965
>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216229
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/CodeGen/PeepholeOptimizer.cpp
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diff --git
a/lib/CodeGen/PeepholeOptimizer.cpp
b/lib/CodeGen/PeepholeOptimizer.cpp
index
ae14331
..
98fcc2e
100644
(file)
--- a/
lib/CodeGen/PeepholeOptimizer.cpp
+++ b/
lib/CodeGen/PeepholeOptimizer.cpp
@@
-899,7
+899,11
@@
bool PeepholeOptimizer::optimizeCoalescableCopy(MachineInstr *MI) {
if (!findNextSource(NewSrc, NewSubReg) || SrcReg == NewSrc)
continue;
// Rewrite source.
- Changed |= CpyRewriter->RewriteCurrentSource(NewSrc, NewSubReg);
+ if (CpyRewriter->RewriteCurrentSource(NewSrc, NewSubReg)) {
+ // We may have extended the live-range of NewSrc, account for that.
+ MRI->clearKillFlags(NewSrc);
+ Changed = true;
+ }
}
// TODO: We could have a clean-up method to tidy the instruction.
// E.g., v0 = INSERT_SUBREG v1, v1.sub0, sub0