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Handle more cases in LiveRangeEdit::eliminateDeadDefs.

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Live intervals for dead physregs may be created during coalescing. We
need to update these in the event that their instruction goes away.

crash.ll is the unit test that catches it when MI sched is enabled on
X86.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184572 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-06-21 18:33:20 +00:00
parent f1f99f394f
commit 03dca5e4b6
2 changed files with 13 additions and 4 deletions
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8
include/llvm/CodeGen/MachineRegisterInfo.h
View File

@ -58,10 +58,6 @@ class MachineRegisterInfo {
/// physical registers.
MachineOperand **PhysRegUseDefLists;
const TargetRegisterInfo *getTargetRegisterInfo() const {
return TM.getRegisterInfo();
}
/// getRegUseDefListHead - Return the head pointer for the register use/def
/// list for the specified virtual or physical register.
MachineOperand *&getRegUseDefListHead(unsigned RegNo) {
@ -116,6 +112,10 @@ public:
explicit MachineRegisterInfo(const TargetMachine &TM);
~MachineRegisterInfo();
const TargetRegisterInfo *getTargetRegisterInfo() const {
return TM.getRegisterInfo();
}
//===--------------------------------------------------------------------===//
// Function State
//===--------------------------------------------------------------------===//

9
lib/CodeGen/LiveRangeEdit.cpp
View File

@ -249,6 +249,15 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
// Check if MI reads any unreserved physregs.
if (Reg && MOI->readsReg() && !MRI.isReserved(Reg))
ReadsPhysRegs = true;
else if (MOI->isDef()) {
for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo());
Units.isValid(); ++Units) {
if (LiveInterval *LI = LIS.getCachedRegUnit(*Units)) {
if (VNInfo *VNI = LI->getVNInfoAt(Idx))
LI->removeValNo(VNI);
}
}
}
continue;
}
LiveInterval &LI = LIS.getInterval(Reg);