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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-10 12:50:44 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-10 12:50:44 +0000 |
| commit | 6338e61ae9222f59f7d1c0652a328b7d24f1f856 (patch) | |
| tree | 2ef1e638f33ed1d0c997e04526945271e249fac0 /llvm/lib/CodeGen/MachineRegisterInfo.cpp | |
| parent | 113bee05361d648adb51edd0e2ec281432d2009f (diff) | |
| download | bcm5719-llvm-6338e61ae9222f59f7d1c0652a328b7d24f1f856.tar.gz bcm5719-llvm-6338e61ae9222f59f7d1c0652a328b7d24f1f856.zip | |
Microoptimize getVRegDef. def_begin isn't free, don't compute it twice.
llvm-svn: 152492
Diffstat (limited to 'llvm/lib/CodeGen/MachineRegisterInfo.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineRegisterInfo.cpp | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp index 7d40e66eb81..f140decd96c 100644 --- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp +++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp @@ -161,9 +161,8 @@ void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) { /// form, so there should only be one definition. MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const { // Since we are in SSA form, we can use the first definition. - if (!def_empty(Reg)) - return &*def_begin(Reg); - return 0; + def_iterator I = def_begin(Reg); + return !I.atEnd() ? &*I : 0; } bool MachineRegisterInfo::hasOneUse(unsigned RegNo) const { |
