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Some cleanup and optimize fallthrough more.

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llvm-svn: 130546
This commit is contained in:
Eric Christopher 2011-04-29 21:56:31 +00:00
parent 13b74fd203
commit a6fb14395f
1 changed files with 13 additions and 8 deletions
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21
lib/Target/ARM/ARMFastISel.cpp
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@ -1045,18 +1045,16 @@ bool ARMFastISel::SelectBranch(const Instruction *I) {
// behavior.
// TODO: Factor this out.
if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
if (CI->hasOneUse() && (CI->getParent() == I->getParent())) {
MVT VT;
const Type *Ty = CI->getOperand(0)->getType();
if (!isTypeLegal(Ty, VT))
return false;
MVT SourceVT;
const Type *Ty = CI->getOperand(0)->getType();
if (CI->hasOneUse() && (CI->getParent() == I->getParent())
&& isTypeLegal(Ty, SourceVT)) {
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
if (isFloat && !Subtarget->hasVFP2())
return false;
unsigned CmpOpc;
switch (VT.SimpleTy) {
switch (SourceVT.SimpleTy) {
default: return false;
// TODO: Verify compares.
case MVT::f32:
@ -1071,7 +1069,14 @@ bool ARMFastISel::SelectBranch(const Instruction *I) {
}
// Get the compare predicate.
ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
// Try to take advantage of fallthrough opportunities.
CmpInst::Predicate Predicate = CI->getPredicate();
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
std::swap(TBB, FBB);
Predicate = CmpInst::getInversePredicate(Predicate);
}
ARMCC::CondCodes ARMPred = getComparePred(Predicate);
// We may not handle every CC for now.
if (ARMPred == ARMCC::AL) return false;