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If a vr is already marked alive in a bb, then it has PHI uses that are visited earlier, then it is not killed in the def block (i.e. not dead).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46763 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-05 20:04:18 +00:00
parent 399c7c76cf
commit bb4151bd1f
2 changed files with 70 additions and 2 deletions
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5
lib/CodeGen/LiveVariables.cpp
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@@ -436,8 +436,9 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
if (MO.isRegister() && MO.isDef() && MO.getReg()) {
if (MRegisterInfo::isVirtualRegister(MO.getReg())) {
VarInfo &VRInfo = getVarInfo(MO.getReg());
// Defaults to dead
VRInfo.Kills.push_back(MI);
if (VRInfo.AliveBlocks.none())
// If vr is not alive in any block, then defaults to dead.
VRInfo.Kills.push_back(MI);
} else if (MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
!ReservedRegisters[MO.getReg()]) {
HandlePhysRegDef(MO.getReg(), MI);