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Simplify a few more uses of reg_iterator.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-25 22:26:13 +00:00
parent 29438d13e0
commit 2bf0649e05
3 changed files with 8 additions and 12 deletions
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8
lib/CodeGen/MachineRegisterInfo.cpp
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@ -110,11 +110,9 @@ void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) {
MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
assert(Reg-TargetRegisterInfo::FirstVirtualRegister < VRegInfo.size() &&
"Invalid vreg!");
for (reg_iterator I = reg_begin(Reg), E = reg_end(); I != E; ++I) {
// Since we are in SSA form, we can stop at the first definition.
if (I.getOperand().isDef())
return &*I;
}
// Since we are in SSA form, we can use the first definition.
if (!def_empty(Reg))
return &*def_begin(Reg);
return 0;
}