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| author | Chuang-Yu Cheng <cycheng@multicorewareinc.com> | 2016-04-12 03:10:52 +0000 |
|---|---|---|
| committer | Chuang-Yu Cheng <cycheng@multicorewareinc.com> | 2016-04-12 03:10:52 +0000 |
| commit | 94f58e79aebff75f955f888f223cc2d507c41f20 (patch) | |
| tree | 42dc614abd028fd1488703c41db7a125088e9605 /llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | |
| parent | c066d9cf55686a1fff5b7fe1bd1b77bdac6dca54 (diff) | |
| download | llvm-94f58e79aebff75f955f888f223cc2d507c41f20.zip llvm-94f58e79aebff75f955f888f223cc2d507c41f20.tar.gz llvm-94f58e79aebff75f955f888f223cc2d507c41f20.tar.bz2 | |
[PPC64] Mark CR0 Live if PPCInstrInfo::optimizeCompareInstr Creates a Use of CR0
Resolve Bug 27046 (https://llvm.org/bugs/show_bug.cgi?id=27046).
The PPCInstrInfo::optimizeCompareInstr function could create a new use of
CR0, even if CR0 were previously dead. This patch marks CR0 live if a use of
CR0 is created.
Author: Tom Jablin (tjablin)
Reviewers: hfinkel kbarton cycheng
http://reviews.llvm.org/D18884
llvm-svn: 266040
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCInstrInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp index 76f97b1..b6dc00f 100644 --- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -1763,6 +1763,10 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr *CmpInstr, get(TargetOpcode::COPY), CRReg) .addReg(PPC::CR0, MIOpC != NewOpC ? RegState::Kill : 0); + // Even if CR0 register were dead before, it is alive now since the + // instruction we just built uses it. + MI->clearRegisterDeads(PPC::CR0); + if (MIOpC != NewOpC) { // We need to be careful here: we're replacing one instruction with // another, and we need to make sure that we get all of the right |