Properly enable rematerialization when spilling after live range splitting.
The instruction to be rematerialized may not be the one defining the register
that is being spilled. The traceSiblingValue() function sees through sibling
copies to find the remat candidate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128449 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRangeEdit.h b/lib/CodeGen/LiveRangeEdit.h
index 0e03137..04eced6 100644
--- a/lib/CodeGen/LiveRangeEdit.h
+++ b/lib/CodeGen/LiveRangeEdit.h
@@ -125,6 +125,11 @@
bool anyRematerializable(LiveIntervals&, const TargetInstrInfo&,
AliasAnalysis*);
+ /// checkRematerializable - Manually add VNI to the list of rematerializable
+ /// values if DefMI may be rematerializable.
+ void checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
+ const TargetInstrInfo&, AliasAnalysis*);
+
/// Remat - Information needed to rematerialize at a specific location.
struct Remat {
VNInfo *ParentVNI; // parent_'s value at the remat location.