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| author | Kang Zhang <shkzhang@cn.ibm.com> | 2020-06-03 15:25:30 +0000 |
|---|---|---|
| committer | Kang Zhang <shkzhang@cn.ibm.com> | 2020-06-03 15:25:30 +0000 |
| commit | 2cc77b2b8a022c0f6c7c60bf3eda157f62007d88 (patch) | |
| tree | 24b5159585a1744fb07c30ff3f7e6626589a44a6 /llvm/lib/CodeGen/LiveVariables.cpp | |
| parent | c57e41c000c40e2efd441bc819b472feb49c94bf (diff) | |
| download | llvm-2cc77b2b8a022c0f6c7c60bf3eda157f62007d88.zip llvm-2cc77b2b8a022c0f6c7c60bf3eda157f62007d88.tar.gz llvm-2cc77b2b8a022c0f6c7c60bf3eda157f62007d88.tar.bz2 | |
[LiveVariables] Don't set undef reg PHI used as live for FromMBB
Summary:
In the patch D73152, it adds a new function LiveVariables::addNewBlock.
This new function will add the reg which PHI used to the MBB which reg
is from.
But the new function may cause LiveVariable Verification failed when the
Src reg in PHI is undef.
Reviewed By: bjope
Differential Revision: https://reviews.llvm.org/D80077
Diffstat (limited to 'llvm/lib/CodeGen/LiveVariables.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/LiveVariables.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/LiveVariables.cpp b/llvm/lib/CodeGen/LiveVariables.cpp index 7e89471..6610491 100644 --- a/llvm/lib/CodeGen/LiveVariables.cpp +++ b/llvm/lib/CodeGen/LiveVariables.cpp @@ -828,7 +828,8 @@ void LiveVariables::addNewBlock(MachineBasicBlock *BB, BBE = SuccBB->end(); BBI != BBE && BBI->isPHI(); ++BBI) { for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) - if (BBI->getOperand(i + 1).getMBB() == BB) + if (BBI->getOperand(i + 1).getMBB() == BB && + BBI->getOperand(i).readsReg()) getVarInfo(BBI->getOperand(i).getReg()) .AliveBlocks.set(NumNew); } |