RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-31 20:51:52 +01:00
Code Issues Projects Releases Wiki Activity

[InstCombine] reduce code duplication in icmp intrinsic folds; NFC

Browse Source
This commit is contained in:
Sanjay Patel 2020-10-26 16:17:29 -04:00
parent be7bad8bb6
commit f7a844a775
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -3172,10 +3172,11 @@ Instruction *InstCombinerImpl::foldICmpIntrinsicWithConstant(ICmpInst &Cmp,
Type *Ty = II->getType();
unsigned BitWidth = C.getBitWidth();
ICmpInst::Predicate Pred = Cmp.getPredicate();
switch (II->getIntrinsicID()) {
case Intrinsic::ctlz: {
// ctlz(0bXXXXXXXX) > 3 -> 0bXXXXXXXX < 0b00010000
if (Cmp.getPredicate() == ICmpInst::ICMP_UGT && C.ult(BitWidth)) {
if (Pred == ICmpInst::ICMP_UGT && C.ult(BitWidth)) {
unsigned Num = C.getLimitedValue();
APInt Limit = APInt::getOneBitSet(BitWidth, BitWidth - Num - 1);
return CmpInst::Create(Instruction::ICmp, ICmpInst::ICMP_ULT,
@ -3183,8 +3184,7 @@ Instruction *InstCombinerImpl::foldICmpIntrinsicWithConstant(ICmpInst &Cmp,
}
// ctlz(0bXXXXXXXX) < 3 -> 0bXXXXXXXX > 0b00011111
if (Cmp.getPredicate() == ICmpInst::ICMP_ULT &&
C.uge(1) && C.ule(BitWidth)) {
if (Pred == ICmpInst::ICMP_ULT && C.uge(1) && C.ule(BitWidth)) {
unsigned Num = C.getLimitedValue();
APInt Limit = APInt::getLowBitsSet(BitWidth, BitWidth - Num);
return CmpInst::Create(Instruction::ICmp, ICmpInst::ICMP_UGT,
@ -3198,7 +3198,7 @@ Instruction *InstCombinerImpl::foldICmpIntrinsicWithConstant(ICmpInst &Cmp,
return nullptr;
// cttz(0bXXXXXXXX) > 3 -> 0bXXXXXXXX & 0b00001111 == 0
if (Cmp.getPredicate() == ICmpInst::ICMP_UGT && C.ult(BitWidth)) {
if (Pred == ICmpInst::ICMP_UGT && C.ult(BitWidth)) {
APInt Mask = APInt::getLowBitsSet(BitWidth, C.getLimitedValue() + 1);
return CmpInst::Create(Instruction::ICmp, ICmpInst::ICMP_EQ,
Builder.CreateAnd(II->getArgOperand(0), Mask),
@ -3206,8 +3206,7 @@ Instruction *InstCombinerImpl::foldICmpIntrinsicWithConstant(ICmpInst &Cmp,
}
// cttz(0bXXXXXXXX) < 3 -> 0bXXXXXXXX & 0b00000111 != 0
if (Cmp.getPredicate() == ICmpInst::ICMP_ULT &&
C.uge(1) && C.ule(BitWidth)) {
if (Pred == ICmpInst::ICMP_ULT && C.uge(1) && C.ule(BitWidth)) {
APInt Mask = APInt::getLowBitsSet(BitWidth, C.getLimitedValue());
return CmpInst::Create(Instruction::ICmp, ICmpInst::ICMP_NE,
Builder.CreateAnd(II->getArgOperand(0), Mask),