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Load from stub is already re-materializable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48911 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-28 06:49:25 +00:00
parent 0c78ac11dd
commit 86f57b0983
1 changed files with 12 additions and 8 deletions
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20
lib/Target/X86/X86InstrInfo.cpp
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@ -748,6 +748,12 @@ static bool regIsPICBase(unsigned BaseReg, MachineRegisterInfo &MRI) {
}
return isPICBase;
}
/// isGVStub - Return true if the GV requires an extra load to get the
/// real address.
static inline bool isGVStub(GlobalValue *GV, X86TargetMachine &TM) {
return TM.getSubtarget<X86Subtarget>().GVRequiresExtraLoad(GV, TM, false);
}
bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const {
switch (MI->getOpcode()) {
@ -769,7 +775,9 @@ bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const {
if (MI->getOperand(1).isReg() &&
MI->getOperand(2).isImm() &&
MI->getOperand(3).isReg() && MI->getOperand(3).getReg() == 0 &&
MI->getOperand(4).isCPI()) {
(MI->getOperand(4).isCPI() ||
(MI->getOperand(4).isGlobal() &&
isGVStub(MI->getOperand(4).getGlobal(), TM)))) {
unsigned BaseReg = MI->getOperand(1).getReg();
if (BaseReg == 0)
return true;
@ -831,13 +839,9 @@ bool X86InstrInfo::isInvariantLoad(MachineInstr *MI) const {
// Loads from constant pools are trivially invariant.
if (MO.isCPI())
return true;
if (MO.isGlobal()) {
if (TM.getSubtarget<X86Subtarget>().GVRequiresExtraLoad(MO.getGlobal(),
TM, false))
return true;
return false;
}
if (MO.isGlobal())
return isGVStub(MO.getGlobal(), TM);
// If this is a load from an invariant stack slot, the load is a constant.
if (MO.isFI()) {