[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/TargetInstrInfo.cpp b/llvm/lib/CodeGen/TargetInstrInfo.cpp
index 800ad6d..6d90f9d 100644
--- a/llvm/lib/CodeGen/TargetInstrInfo.cpp
+++ b/llvm/lib/CodeGen/TargetInstrInfo.cpp
@@ -497,7 +497,8 @@
/// stream.
MachineInstr *TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
ArrayRef<unsigned> Ops,
- int FI) const {
+ int FI,
+ LiveIntervals *LIS) const {
unsigned Flags = 0;
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
if (MI->getOperand(Ops[i]).isDef())
@@ -519,7 +520,7 @@
MBB->insert(MI, NewMI);
} else {
// Ask the target to do the actual folding.
- NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, FI);
+ NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, FI, LIS);
}
if (NewMI) {
@@ -778,7 +779,8 @@
/// stack slot.
MachineInstr *TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
ArrayRef<unsigned> Ops,
- MachineInstr *LoadMI) const {
+ MachineInstr *LoadMI,
+ LiveIntervals *LIS) const {
assert(LoadMI->canFoldAsLoad() && "LoadMI isn't foldable!");
#ifndef NDEBUG
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
@@ -800,7 +802,7 @@
NewMI = MBB.insert(MI, NewMI);
} else {
// Ask the target to do the actual folding.
- NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, LoadMI);
+ NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, LoadMI, LIS);
}
if (!NewMI) return nullptr;