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| author | Adrian Prantl <aprantl@apple.com> | 2017-12-13 19:10:54 +0000 |
|---|---|---|
| committer | Adrian Prantl <aprantl@apple.com> | 2017-12-13 19:10:54 +0000 |
| commit | 46af7316ea1d584e3e17604a7720300b9569d257 (patch) | |
| tree | 67dc08d97795539e0e9e9e39c372eccf03c1bc8c /llvm/lib/CodeGen | |
| parent | ce5930af5cb9e1e8e698765f9c5a9a5397b6d385 (diff) | |
| download | bcm5719-llvm-46af7316ea1d584e3e17604a7720300b9569d257.tar.gz bcm5719-llvm-46af7316ea1d584e3e17604a7720300b9569d257.zip | |
Ignore metainstructions during the shrink wrap analysis
Shrink wrapping should ignore DBG_VALUEs referring to frame indices,
since the presence of debug information must not affect code
generation.
Differential Revision: https://reviews.llvm.org/D41187
llvm-svn: 320606
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/ShrinkWrap.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/ShrinkWrap.cpp b/llvm/lib/CodeGen/ShrinkWrap.cpp index ed01a90969d..2d9012978fd 100644 --- a/llvm/lib/CodeGen/ShrinkWrap.cpp +++ b/llvm/lib/CodeGen/ShrinkWrap.cpp @@ -240,6 +240,10 @@ INITIALIZE_PASS_END(ShrinkWrap, DEBUG_TYPE, "Shrink Wrap Pass", false, false) bool ShrinkWrap::useOrDefCSROrFI(const MachineInstr &MI, RegScavenger *RS) const { + // Ignore DBG_VALUE and other meta instructions that must not affect codegen. + if (MI.isMetaInstruction()) + return false; + if (MI.getOpcode() == FrameSetupOpcode || MI.getOpcode() == FrameDestroyOpcode) { DEBUG(dbgs() << "Frame instruction: " << MI << '\n'); |
