Avoid folding a load instruction into an instruction that redefines the register.
The target hook doesn't know how to do that. (Neither do I).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125108 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 3e4f6c8..00ca3d5 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -157,7 +157,8 @@
// Finally we can rematerialize OrigMI before MI.
SlotIndex DefIdx = edit_->rematerializeAt(*MI->getParent(), MI, NewLI.reg, RM,
lis_, tii_, tri_);
- DEBUG(dbgs() << "\tremat: " << DefIdx << '\n');
+ DEBUG(dbgs() << "\tremat: " << DefIdx << '\t'
+ << *lis_.getInstructionFromIndex(DefIdx));
// Replace operands
for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
@@ -270,6 +271,9 @@
// FIXME: Teach targets to deal with subregs.
if (MO.getSubReg())
return false;
+ // We cannot fold a load instruction into a def.
+ if (LoadMI && MO.isDef())
+ return false;
// Tied use operands should not be passed to foldMemoryOperand.
if (!MI->isRegTiedToDefOperand(Idx))
FoldOps.push_back(Idx);