Add LiveIntervals::addKillFlags() to recompute kill flags after register allocation.
This is a lot easier than trying to get kill flags right during live range
splitting and rematerialization.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125113 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 4ff888a..3739d28 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -890,6 +890,29 @@
return mbb->getFirstTerminator();
}
+void LiveIntervals::addKillFlags() {
+ for (iterator I = begin(), E = end(); I != E; ++I) {
+ unsigned Reg = I->first;
+ if (TargetRegisterInfo::isPhysicalRegister(Reg))
+ continue;
+ if (mri_->reg_nodbg_empty(Reg))
+ continue;
+ LiveInterval *LI = I->second;
+
+ // Every instruction that kills Reg corresponds to a live range end point.
+ for (LiveInterval::iterator RI = LI->begin(), RE = LI->end(); RI != RE;
+ ++RI) {
+ // A LOAD index indicates an MBB edge.
+ if (RI->end.isLoad())
+ continue;
+ MachineInstr *MI = getInstructionFromIndex(RI->end);
+ if (!MI)
+ continue;
+ MI->addRegisterKilled(Reg, NULL);
+ }
+ }
+}
+
/// getReMatImplicitUse - If the remat definition MI has one (for now, we only
/// allow one) virtual register operand, then its uses are implicitly using
/// the register. Returns the virtual register.