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Refactor some code out of MachineSink into a MachineInstr query.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48311 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-03-13 00:44:09 +00:00
parent d75686a471
commit b27087f5aa
3 changed files with 45 additions and 30 deletions
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42
lib/CodeGen/MachineInstr.cpp
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@ -628,16 +628,46 @@ void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {
/// copyPredicates - Copies predicate operand(s) from MI.
void MachineInstr::copyPredicates(const MachineInstr *MI) {
const TargetInstrDesc &TID = MI->getDesc();
if (TID.isPredicable()) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
if (TID.OpInfo[i].isPredicate()) {
// Predicated operands must be last operands.
addOperand(MI->getOperand(i));
}
if (!TID.isPredicable())
return;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
if (TID.OpInfo[i].isPredicate()) {
// Predicated operands must be last operands.
addOperand(MI->getOperand(i));
}
}
}
/// isSafeToMove - Return true if it is safe to this instruction. If SawStore
/// true, it means there is a store (or call) between the instruction the
/// localtion and its intended destination.
bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) {
// Ignore stuff that we obviously can't move.
if (TID->mayStore() || TID->isCall()) {
SawStore = true;
return false;
}
if (TID->isReturn() || TID->isBranch() || TID->hasUnmodeledSideEffects())
return false;
// See if this instruction does a load. If so, we have to guarantee that the
// loaded value doesn't change between the load and the its intended
// destination. The check for isInvariantLoad gives the targe the chance to
// classify the load as always returning a constant, e.g. a constant pool
// load.
if (TID->mayLoad() && !TII->isInvariantLoad(this)) {
// Otherwise, this is a real load. If there is a store between the load and
// end of block, we can't sink the load.
//
// FIXME: we can't do this transformation until we know that the load is
// not volatile, and machineinstrs don't keep this info. :(
//
//if (SawStore)
return false;
}
return true;
}
void MachineInstr::dump() const {
cerr << " " << *this;
}