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Clear kill flags before propagating a copy.

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The live range of the source register may be extended when a redundant
copy is eliminated. Make sure any kill flags between the two copies are
cleared.

This fixes PR11765.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-01-26 17:52:15 +00:00
parent ef4d3ebe2a
commit 1a96c91431
4 changed files with 145 additions and 1 deletions
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4
include/llvm/CodeGen/MachineInstr.h
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@@ -773,6 +773,10 @@ public:
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound = false);
/// clearRegisterKills - Clear all kill flags affecting Reg. If RegInfo is
/// provided, this includes super-register kills.
void clearRegisterKills(unsigned Reg, const TargetRegisterInfo *RegInfo);
/// addRegisterDead - We have determined MI defined a register without a use.
/// Look for the operand that defines it and mark it as IsDead. If
/// AddIfNotFound is true, add a implicit operand if it's not found. Returns