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RegisterCoalescer: Cleanup by factoring out a common expression

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2015-01-17 00:33:11 +00:00
parent b8f5c8cb95
commit b26c2fc557
1 changed files with 6 additions and 5 deletions
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11
lib/CodeGen/RegisterCoalescer.cpp
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@ -1407,21 +1407,22 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
}
bool RegisterCoalescer::joinReservedPhysReg(CoalescerPair &CP) {
unsigned DstReg = CP.getDstReg();
assert(CP.isPhys() && "Must be a physreg copy");
assert(MRI->isReserved(CP.getDstReg()) && "Not a reserved register");
assert(MRI->isReserved(DstReg) && "Not a reserved register");
LiveInterval &RHS = LIS->getInterval(CP.getSrcReg());
DEBUG(dbgs() << "\t\tRHS = " << RHS << '\n');
assert(RHS.containsOneValue() && "Invalid join with reserved register");
// Optimization for reserved registers like ESP. We can only merge with a
// reserved physreg if RHS has a single value that is a copy of CP.DstReg().
// reserved physreg if RHS has a single value that is a copy of DstReg.
// The live range of the reserved register will look like a set of dead defs
// - we don't properly track the live range of reserved registers.
// Deny any overlapping intervals. This depends on all the reserved
// register live ranges to look like dead defs.
for (MCRegUnitIterator UI(CP.getDstReg(), TRI); UI.isValid(); ++UI)
for (MCRegUnitIterator UI(DstReg, TRI); UI.isValid(); ++UI)
if (RHS.overlaps(LIS->getRegUnit(*UI))) {
DEBUG(dbgs() << "\t\tInterference: " << PrintRegUnit(*UI, TRI) << '\n');
return false;
@ -1454,7 +1455,7 @@ bool RegisterCoalescer::joinReservedPhysReg(CoalescerPair &CP) {
for (SlotIndex SI = Indexes->getNextNonNullIndex(DestRegIdx);
SI != CopyRegIdx; SI = Indexes->getNextNonNullIndex(SI)) {
MachineInstr *MI = LIS->getInstructionFromIndex(SI);
if (MI->readsRegister(CP.getDstReg(), TRI)) {
if (MI->readsRegister(DstReg, TRI)) {
DEBUG(dbgs() << "\t\tInterference (read): " << *MI);
return false;
}
@ -1462,7 +1463,7 @@ bool RegisterCoalescer::joinReservedPhysReg(CoalescerPair &CP) {
// We're going to remove the copy which defines a physical reserved
// register, so remove its valno, etc.
for (MCRegUnitIterator UI(CP.getDstReg(), TRI); UI.isValid(); ++UI) {
for (MCRegUnitIterator UI(DstReg, TRI); UI.isValid(); ++UI) {
LiveRange &LR = LIS->getRegUnit(*UI);
VNInfo *OrigRegVNI = LR.getVNInfoAt(CopyRegIdx);
if (!OrigRegVNI)