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Let shrinkToUses optionally return a list of now dead machine instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127192 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-07 23:29:10 +00:00
parent d756eceb83
commit 0d8ccaa5c8
2 changed files with 9 additions and 2 deletions
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4
include/llvm/CodeGen/LiveIntervalAnalysis.h
View File

@ -159,7 +159,9 @@ namespace llvm {
/// range to just the remaining uses. This method does not compute reaching
/// defs for new uses, and it doesn't remove dead defs.
/// Dead PHIDef values are marked as unused.
void shrinkToUses(LiveInterval *li);
/// New dead machine instructions are added to the dead vector.
void shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead = 0);
// Interval removal

7
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -746,7 +746,8 @@ LiveInterval* LiveIntervals::dupInterval(LiveInterval *li) {
/// shrinkToUses - After removing some uses of a register, shrink its live
/// range to just the remaining uses. This method does not compute reaching
/// defs for new uses, and it doesn't remove dead defs.
void LiveIntervals::shrinkToUses(LiveInterval *li) {
void LiveIntervals::shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead) {
DEBUG(dbgs() << "Shrink: " << *li << '\n');
assert(TargetRegisterInfo::isVirtualRegister(li->reg)
&& "Can't only shrink physical registers");
@ -852,6 +853,10 @@ void LiveIntervals::shrinkToUses(LiveInterval *li) {
MachineInstr *MI = getInstructionFromIndex(VNI->def);
assert(MI && "No instruction defining live value");
MI->addRegisterDead(li->reg, tri_);
if (dead && MI->allDefsAreDead()) {
DEBUG(dbgs() << "All defs dead: " << *MI);
dead->push_back(MI);
}
}
}