6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-07-17 20:29:31 +00:00
Code Issues Projects Releases Wiki Activity

Correctly mark a valno that was previous defined by a PHI node as having an

Browse Source 
unknown defining inst after PHI elimination.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-04-02 02:12:45 +00:00
parent 4316dec10e
commit 59df878391
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
lib/CodeGen/StrongPHIElimination.cpp
View File

@ -845,7 +845,6 @@ void StrongPHIElimination::mergeLiveIntervals(unsigned primary,
}
bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
LiveIntervals& LI = getAnalysis<LiveIntervals>();
// Compute DFS numbers of each block
@ -889,15 +888,19 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
// If this is a dead PHI node, then remove it from LiveIntervals.
unsigned DestReg = PInstr->getOperand(0).getReg();
if (PInstr->registerDefIsDead(DestReg)) {
LiveInterval& PI = LI.getInterval(DestReg);
if (PInstr->registerDefIsDead(DestReg)) {
if (PI.containsOneValue()) {
LI.removeInterval(DestReg);
} else {
unsigned idx = LI.getDefIndex(LI.getInstructionIndex(PInstr));
PI.removeRange(*PI.getLiveRangeContaining(idx), true);
}
} else {
// If the PHI is not dead, then the valno defined by the PHI
// now has an unknown def.
unsigned idx = LI.getDefIndex(LI.getInstructionIndex(PInstr));
PI.getLiveRangeContaining(idx)->valno->def = ~0U;
}
LI.RemoveMachineInstrFromMaps(PInstr);