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[InstCombine] Refactor foldICmpMulConstant 

This is a follow-up to 2ebfda2417
(replace "if" with "else if" since the cases nuw/nsw
were meant to be handled separately).

Test plan:
1/ ninja check-llvm check-clang check-lld
2/ Bootstrapped LLVM/Clang pass tests
This commit is contained in:
Alexander Shaposhnikov 2022-07-30 01:43:25 +00:00
parent a0d6105162
commit d982f1e0c6
2 changed files with 4 additions and 4 deletions
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4
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -2053,9 +2053,7 @@ Instruction *InstCombinerImpl::foldICmpMulConstant(ICmpInst &Cmp,
NewC = ConstantInt::get(
Mul->getType(),
APIntOps::RoundingSDiv(C, *MulC, APInt::Rounding::DOWN));
}
if (Mul->hasNoUnsignedWrap()) {
} else if (Mul->hasNoUnsignedWrap()) {
if (Pred == ICmpInst::ICMP_ULT || Pred == ICmpInst::ICMP_UGE)
NewC = ConstantInt::get(
Mul->getType(),

4
llvm/test/Transforms/InstCombine/icmp-mul.ll
View File

@ -860,7 +860,9 @@ define i1 @splat_mul_known_lz(i32 %x) {
define i1 @splat_mul_unknown_lz(i32 %x) {
; CHECK-LABEL: @splat_mul_unknown_lz(
; CHECK-NEXT: [[R:%.*]] = icmp sgt i32 [[X:%.*]], -1
; CHECK-NEXT: [[Z:%.*]] = zext i32 [[X:%.*]] to i128
; CHECK-NEXT: [[M:%.*]] = mul nuw nsw i128 [[Z]], 18446744078004518913
; CHECK-NEXT: [[R:%.*]] = icmp ult i128 [[M]], 39614081257132168796771975168
; CHECK-NEXT: ret i1 [[R]]
;
%z = zext i32 %x to i128