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| author | Carlos Alberto Enciso <carlos.alberto.enciso@gmail.com> | 2018-10-01 08:14:44 +0000 |
|---|---|---|
| committer | Carlos Alberto Enciso <carlos.alberto.enciso@gmail.com> | 2018-10-01 08:14:44 +0000 |
| commit | 81d8ef219671241c1486ca08b07ec6e8b1b7531e (patch) | |
| tree | 19ff3f9bf91854c19d360d1e1977b481862fbd8d /llvm/lib/CodeGen/MachineCopyPropagation.cpp | |
| parent | ce4caff0de60e115974b05fcf240f294f9b7ff7f (diff) | |
| download | llvm-81d8ef219671241c1486ca08b07ec6e8b1b7531e.zip llvm-81d8ef219671241c1486ca08b07ec6e8b1b7531e.tar.gz llvm-81d8ef219671241c1486ca08b07ec6e8b1b7531e.tar.bz2 | |
[DebugInfo][Dexter] Incorrect DBG_VALUE after MCP dead copy instruction removal.
When MachineCopyPropagation eliminates a dead 'copy', its associated debug information becomes invalid. as the recorded register has been removed. It causes the debugger to display wrong variable value.
Differential Revision: https://reviews.llvm.org/D52614
llvm-svn: 343445
Diffstat (limited to 'llvm/lib/CodeGen/MachineCopyPropagation.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCopyPropagation.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp index b530908..dfaa946 100644 --- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp +++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp @@ -598,6 +598,11 @@ void MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) { LLVM_DEBUG(dbgs() << "MCP: Removing copy due to no live-out succ: "; MaybeDead->dump()); assert(!MRI->isReserved(MaybeDead->getOperand(0).getReg())); + + // Update matching debug values. + assert(MaybeDead->isCopy()); + MaybeDead->changeDebugValuesDefReg(MaybeDead->getOperand(1).getReg()); + MaybeDead->eraseFromParent(); Changed = true; ++NumDeletes; |