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Handle regmasks in findRegisterDefOperandIdx().

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Only accept register masks when looking for an 'overlapping' def. When
Overlap is not set, the function searches for a proper definition of
Reg.

This means MI->modifiesRegister() considers register masks, but
MI->definesRegister() doesn't.

llvm-svn: 150529
This commit is contained in:
Jakob Stoklund Olesen 2012-02-14 23:49:37 +00:00
parent 248b6c4556
commit b1738b3c04
2 changed files with 5 additions and 0 deletions
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1
include/llvm/CodeGen/MachineInstr.h
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@ -702,6 +702,7 @@ public:
/// that are not dead are skipped. If Overlap is true, then it also looks for
/// defs that merely overlap the specified register. If TargetRegisterInfo is
/// non-null, then it also checks if there is a def of a super-register.
/// This may also return a register mask operand when Overlap is true.
int findRegisterDefOperandIdx(unsigned Reg,
bool isDead = false, bool Overlap = false,
const TargetRegisterInfo *TRI = NULL) const;

4
lib/CodeGen/MachineInstr.cpp
View File

@ -1045,6 +1045,10 @@ MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap,
bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg);
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
// Accept regmask operands when Overlap is set.
// Ignore them when looking for a specific def operand (Overlap == false).
if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
return i;
if (!MO.isReg() || !MO.isDef())
continue;
unsigned MOReg = MO.getReg();