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Addresses many style issues with prior checkin (r169025)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169043 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pedro Artigas 2012-11-30 22:07:05 +00:00
parent 882092808b
commit c2a08d28eb
1 changed files with 44 additions and 58 deletions
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102
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@ -252,6 +252,42 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
return Changed ? &I : 0;
}
//
// Detect pattern:
//
// log2(Y*0.5)
//
// And check for corresponding fast math flags
//
static void detectLog2OfHalf(Value *&Op, Value *&Y, IntrinsicInst *&Log2) {
if (Op->hasOneUse()) {
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op)) {
if (II->getIntrinsicID() == Intrinsic::log2 &&
II->hasUnsafeAlgebra()) {
Log2 = II;
Value *OpLog2Of = II->getArgOperand(0);
if (OpLog2Of->hasOneUse()) {
if (Instruction *I = dyn_cast<Instruction>(OpLog2Of)) {
if (I->getOpcode() == Instruction::FMul &&
I->hasUnsafeAlgebra()) {
ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
if (CFP && CFP->isExactlyValue(0.5)) {
Y = I->getOperand(1);
} else {
CFP = dyn_cast<ConstantFP>(I->getOperand(1));
if (CFP && CFP->isExactlyValue(0.5)) {
Y = I->getOperand(0);
}
}
}
}
}
}
}
}
}
Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
bool Changed = SimplifyAssociativeOrCommutative(I);
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
@ -290,70 +326,20 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
Value *OpX = NULL;
Value *OpY = NULL;
IntrinsicInst *Log2;
if (Op0->hasOneUse()) {
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op0)) {
if (II->getIntrinsicID() == Intrinsic::log2 &&
II->hasUnsafeAlgebra())
{
Log2 = II;
Value *OpLog2Of = II->getArgOperand(0);
if (OpLog2Of->hasOneUse()) {
if (Instruction *I = dyn_cast<Instruction>(OpLog2Of)) {
if (I->getOpcode() == Instruction::FMul &&
I->hasUnsafeAlgebra())
{
ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
if (CFP && CFP->isExactlyValue(0.5)) {
OpY = I->getOperand(1);
OpX = Op1;
} else {
CFP = dyn_cast<ConstantFP>(I->getOperand(1));
if (CFP && CFP->isExactlyValue(0.5)) {
OpY = I->getOperand(0);
OpX = Op1;
}
}
}
}
}
}
}
}
if (Op1->hasOneUse()) {
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op1)) {
if (II->getIntrinsicID() == Intrinsic::log2 &&
II->hasUnsafeAlgebra())
{
Log2 = II;
Value *OpLog2Of = II->getArgOperand(0);
if (OpLog2Of->hasOneUse()) {
if (Instruction *I = dyn_cast<Instruction>(OpLog2Of)) {
if (I->getOpcode() == Instruction::FMul &&
I->hasUnsafeAlgebra())
{
ConstantFP *CFP = dyn_cast<ConstantFP>(I->getOperand(0));
if (CFP && CFP->isExactlyValue(0.5)) {
OpY = I->getOperand(1);
OpX = Op0;
} else {
CFP = dyn_cast<ConstantFP>(I->getOperand(1));
if (CFP && CFP->isExactlyValue(0.5)) {
OpY = I->getOperand(0);
OpX = Op0;
}
}
}
}
}
}
detectLog2OfHalf(Op0, OpY, Log2);
if (OpY) {
OpX = Op1;
} else {
detectLog2OfHalf(Op1, OpY, Log2);
if (OpY) {
OpX = Op0;
}
}
// if pattern detected emit alternate sequence
if (OpX && OpY) {
Log2->setArgOperand(0, OpY);
Value *FMulVal = Builder->CreateFMul(OpX, Log2);
Instruction *FMul = dyn_cast<Instruction>(FMulVal);
assert(FMul && "Must be instruction as Log2 is instruction");
Instruction *FMul = cast<Instruction>(FMulVal);
FMul->copyFastMathFlags(Log2);
Instruction *FSub = BinaryOperator::CreateFSub(FMulVal, OpX);
FSub->copyFastMathFlags(Log2);