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| author | Dan Gohman <gohman@apple.com> | 2010-05-13 19:24:00 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-05-13 19:24:00 +0000 |
| commit | 2914807ff0557213406f9be8c35dfa593196b4d0 (patch) | |
| tree | 4ce239768a2457c5c072f64be5f7889343988370 /lib/CodeGen/MachineRegisterInfo.cpp | |
| parent | 1ffc159c03023848aefac15da5fc351c0d0eff84 (diff) | |
| download | external_llvm-2914807ff0557213406f9be8c35dfa593196b4d0.zip external_llvm-2914807ff0557213406f9be8c35dfa593196b4d0.tar.gz external_llvm-2914807ff0557213406f9be8c35dfa593196b4d0.tar.bz2 | |
Add a utility function for conservatively clearing kill flags, and make
use of it in MachineCSE.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103726 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineRegisterInfo.cpp')
| -rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index 5465fca..402be47 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/lib/CodeGen/MachineRegisterInfo.cpp @@ -133,6 +133,15 @@ bool MachineRegisterInfo::hasOneNonDBGUse(unsigned RegNo) const { return ++UI == use_nodbg_end(); } +/// clearKillFlags - Iterate over all the uses of the given register and +/// clear the kill flag from the MachineOperand. This function is used by +/// optimization passes which extend register lifetimes and need only +/// preserve conservative kill flag information. +void MachineRegisterInfo::clearKillFlags(unsigned Reg) const { + for (use_iterator UI = use_begin(Reg), UE = use_end(); UI != UE; ++UI) + UI.getOperand().setIsKill(false); +} + bool MachineRegisterInfo::isLiveIn(unsigned Reg) const { for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I) if (I->first == Reg || I->second == Reg) |