[foldMemoryOperand()] Pass LiveIntervals to enable liveness check.
SystemZ (and probably other targets as well) can fold a memory operand
by changing the opcode into a new instruction that as a side-effect
also clobbers the CC-reg.
In order to do this, liveness of that reg must first be checked. When
LIS is passed, getRegUnit() can be called on it and the right
LiveRange is computed on demand.
Reviewed by Matthias Braun.
http://reviews.llvm.org/D19861
llvm-svn: 269026
diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp
index 3ed02f4..8b355f0 100644
--- a/llvm/lib/CodeGen/LiveRangeEdit.cpp
+++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp
@@ -205,7 +205,7 @@
if (UseMI->readsWritesVirtualRegister(LI->reg, &Ops).second)
return false;
- MachineInstr *FoldMI = TII.foldMemoryOperand(UseMI, Ops, DefMI);
+ MachineInstr *FoldMI = TII.foldMemoryOperand(UseMI, Ops, DefMI, &LIS);
if (!FoldMI)
return false;
DEBUG(dbgs() << " folded: " << *FoldMI);