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| author | Evan Cheng <evan.cheng@apple.com> | 2012-01-12 20:31:24 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2012-01-12 20:31:24 +0000 |
| commit | 5c03a6b8f59399d524621600e845b7715b7ce969 (patch) | |
| tree | 0ccbb664f37d357e66957a98a498e4bab14aafe7 /llvm/lib/CodeGen/BranchFolding.cpp | |
| parent | 9a167eeaff461e705ec06f0fd5396a549da17fd0 (diff) | |
| download | bcm5719-llvm-5c03a6b8f59399d524621600e845b7715b7ce969.tar.gz bcm5719-llvm-5c03a6b8f59399d524621600e845b7715b7ce969.zip | |
When hoisting common code, watch out for uses which are marked "kill". If the
killed registers are needed below the insertion point, then unset the kill
marker.
Sorry I'm not able to find a reduced test case.
rdar://10660944
llvm-svn: 148043
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index 89894c37ee0..793e4f07063 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/lib/CodeGen/BranchFolding.cpp @@ -1618,6 +1618,11 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) { IsSafe = false; break; } + + if (MO.isKill() && Uses.count(Reg)) + // Kills a register that's read by the instruction at the point of + // insertion. Remove the kill marker. + MO.setIsKill(false); } } if (!IsSafe) |
