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As Evan suggested, loads from constant pool are safe to speculate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142593 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-10-20 17:42:23 +00:00
parent e6de9f30cb
commit 06e16bbec0
1 changed files with 5 additions and 5 deletions
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10
lib/CodeGen/MachineLICM.cpp
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@ -762,15 +762,15 @@ void MachineLICM::UpdateRegPressure(const MachineInstr *MI) {
}
}
/// isLoadFromGOT - Return true if this machine instruction loads from
/// global offset table.
static bool isLoadFromGOT(MachineInstr &MI) {
/// isLoadFromGOTOrConstantPool - Return true if this machine instruction
/// loads from global offset table or constant pool.
static bool isLoadFromGOTOrConstantPool(MachineInstr &MI) {
assert (MI.getDesc().mayLoad() && "Expected MI that loads!");
for (MachineInstr::mmo_iterator I = MI.memoperands_begin(),
E = MI.memoperands_end(); I != E; ++I) {
if (const Value *V = (*I)->getValue()) {
if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
if (PSV == PSV->getGOT())
if (PSV == PSV->getGOT() || PSV == PSV->getConstantPool())
return true;
}
}
@ -792,7 +792,7 @@ bool MachineLICM::IsLICMCandidate(MachineInstr &I) {
// from constant memory are not safe to speculate all the time, for example
// indexed load from a jump table.
// Stores and side effects are already checked by isSafeToMove.
if (I.getDesc().mayLoad() && !isLoadFromGOT(I) &&
if (I.getDesc().mayLoad() && !isLoadFromGOTOrConstantPool(I) &&
!IsGuaranteedToExecute(I.getParent()))
return false;