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Never add a kill flag to a constrained physical register in a two-addr instruction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77906 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-08-02 19:13:03 +00:00
parent 0e6a4efdd4
commit ece4818516
3 changed files with 3 additions and 6 deletions
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3
lib/CodeGen/MachineInstr.cpp
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@ -1041,6 +1041,9 @@ bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
if (MO.isKill())
// The register is already marked kill.
return true;
if (isPhysReg && isRegTiedToDefOperand(i))
// Two-address uses of physregs must not be marked kill.
return true;
MO.setIsKill();
Found = true;
}