It's not safe eliminate copies where src and dst have different sub-register indices.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp
index 75875d2..62f525f 100644
--- a/lib/CodeGen/ProcessImplicitDefs.cpp
+++ b/lib/CodeGen/ProcessImplicitDefs.cpp
@@ -46,7 +46,7 @@
const TargetInstrInfo *tii_) {
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
- Reg == SrcReg)
+ Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0)
return true;
if (OpIdx == 2 && MI->isSubregToReg())
@@ -220,7 +220,7 @@
// Turn a copy use into an implicit_def.
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
- Reg == SrcReg) {
+ Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) {
RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF));
bool isKill = false;
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp
index 7eafbc8..ab5e103 100644
--- a/lib/CodeGen/RegAllocFast.cpp
+++ b/lib/CodeGen/RegAllocFast.cpp
@@ -583,7 +583,8 @@
unsigned SrcCopyPhysReg = 0U;
bool isCopy = TII->isMoveInstr(*MI, SrcCopyReg, DstCopyReg,
SrcCopySubReg, DstCopySubReg);
- if (isCopy && TargetRegisterInfo::isVirtualRegister(SrcCopyReg))
+ if (isCopy && SrcCopySubReg == 0 && DstCopySubReg == 0 &&
+ TargetRegisterInfo::isVirtualRegister(SrcCopyReg))
SrcCopyPhysReg = getVirt2PhysRegMapSlot(SrcCopyReg);
// Loop over the implicit uses, making sure they don't get reallocated.
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 6b0b2d1..7e13bf7 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -460,7 +460,7 @@
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (!tii_->isMoveInstr(*UseMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx))
continue;
- if (DstReg == IntB.reg) {
+ if (DstReg == IntB.reg && DstSubIdx == 0) {
// This copy will become a noop. If it's defining a new val#,
// remove that val# as well. However this live range is being
// extended to the end of the existing live range defined by the copy.
@@ -624,7 +624,7 @@
LR->valno->addKill(LastUseIdx.getDefIndex());
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (tii_->isMoveInstr(*LastUseMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
- DstReg == li.reg) {
+ DstReg == li.reg && DstSubIdx == 0) {
// Last use is itself an identity code.
int DeadIdx = LastUseMI->findRegisterDefOperandIdx(li.reg, false, tri_);
LastUseMI->getOperand(DeadIdx).setIsDead();
@@ -810,6 +810,8 @@
unsigned CopySrcReg, CopyDstReg, CopySrcSubIdx, CopyDstSubIdx;
if (tii_->isMoveInstr(*UseMI, CopySrcReg, CopyDstReg,
CopySrcSubIdx, CopyDstSubIdx) &&
+ CopySrcSubIdx == 0 &&
+ CopyDstSubIdx == 0 &&
CopySrcReg != CopyDstReg &&
CopySrcReg == SrcReg && CopyDstReg != UseDstReg) {
// If the use is a copy and it won't be coalesced away, and its source
@@ -2637,7 +2639,7 @@
MachineInstr *UseMI = Use.getParent();
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (tii_->isMoveInstr(*UseMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
- SrcReg == DstReg)
+ SrcReg == DstReg && SrcSubIdx == DstSubIdx)
// Ignore identity copies.
continue;
SlotIndex Idx = li_->getInstructionIndex(UseMI);
@@ -2666,7 +2668,7 @@
// Ignore identity copies.
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (!(tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
- SrcReg == DstReg))
+ SrcReg == DstReg && SrcSubIdx == DstSubIdx))
for (unsigned i = 0, NumOps = MI->getNumOperands(); i != NumOps; ++i) {
MachineOperand &Use = MI->getOperand(i);
if (Use.isReg() && Use.isUse() && Use.getReg() &&
@@ -2797,7 +2799,7 @@
// If the move will be an identity move delete it
bool isMove= tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx);
- if (isMove && SrcReg == DstReg) {
+ if (isMove && SrcReg == DstReg && SrcSubIdx == DstSubIdx) {
if (li_->hasInterval(SrcReg)) {
LiveInterval &RegInt = li_->getInterval(SrcReg);
// If def of this move instruction is dead, remove its live range
diff --git a/lib/CodeGen/VirtRegRewriter.cpp b/lib/CodeGen/VirtRegRewriter.cpp
index 9b46273..9c32480 100644
--- a/lib/CodeGen/VirtRegRewriter.cpp
+++ b/lib/CodeGen/VirtRegRewriter.cpp
@@ -2425,7 +2425,8 @@
// eliminate this or else the undef marker is lost and it will
// confuses the scavenger. This is extremely rare.
unsigned Src, Dst, SrcSR, DstSR;
- if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst &&
+ if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) &&
+ Src == Dst && SrcSR == DstSR &&
!MI.findRegisterUseOperand(Src)->isUndef()) {
++NumDCE;
DEBUG(dbgs() << "Removing now-noop copy: " << MI);
@@ -2514,7 +2515,8 @@
// instruction before considering the dest reg to be changed.
{
unsigned Src, Dst, SrcSR, DstSR;
- if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst) {
+ if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) &&
+ Src == Dst && SrcSR == DstSR) {
++NumDCE;
DEBUG(dbgs() << "Removing now-noop copy: " << MI);
InvalidateKills(MI, TRI, RegKills, KillOps);