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Clean up the handling of two-address operands in RegScavenger.

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This fixes PR4528.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78107 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-08-04 21:30:30 +00:00
parent f955cbf56f
commit 323e7d32ab
2 changed files with 36 additions and 12 deletions
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15
lib/CodeGen/RegisterScavenging.cpp
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@@ -224,11 +224,13 @@ void RegScavenger::forward() {
BitVector KillRegs(NumPhysRegs);
for (unsigned i = 0, e = UseMOs.size(); i != e; ++i) {
const MachineOperand MO = *UseMOs[i].first;
unsigned Idx = UseMOs[i].second;
unsigned Reg = MO.getReg();
assert(isUsed(Reg) && "Using an undefined register!");
if (MO.isKill() && !isReserved(Reg)) {
// Two-address operands implicitly kill.
if ((MO.isKill() || MI->isRegTiedToDefOperand(Idx)) && !isReserved(Reg)) {
KillRegs.set(Reg);
// Mark sub-registers as used.
@@ -251,8 +253,6 @@ void RegScavenger::forward() {
for (unsigned i = 0, e = NumECs + NumDefs; i != e; ++i) {
const MachineOperand &MO = (i < NumECs)
? *EarlyClobberMOs[i].first : *DefMOs[i-NumECs].first;
unsigned Idx = (i < NumECs)
? EarlyClobberMOs[i].second : DefMOs[i-NumECs].second;
unsigned Reg = MO.getReg();
if (MO.isUndef())
continue;
@@ -263,15 +263,6 @@ void RegScavenger::forward() {
continue;
}
// Skip two-address destination operand.
unsigned UseIdx;
if (MI->isRegTiedToUseOperand(Idx, &UseIdx) &&
!MI->getOperand(UseIdx).isUndef()) {
assert(!MI->getOperand(UseIdx).isKill() &&
"Using an undefined register!");
continue;
}
// Skip if this is merely redefining part of a super-register.
if (RedefinesSuperRegPart(MI, MO, TRI))
continue;