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[InstCombine] add tests for masked sub; NFC

This commit is contained in:
Sanjay Patel 2022-07-08 08:35:36 -04:00
parent 015834e455
commit 0cf5d40d4c
1 changed files with 34 additions and 1 deletions
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35
llvm/test/Transforms/InstCombine/sub-xor.ll
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@ -25,11 +25,44 @@ define <2 x i32> @test1vec(<2 x i32> %x) {
ret <2 x i32> %sub
}
define i8 @masked_sub_i8(i8 %x) {
; CHECK-LABEL: @masked_sub_i8(
; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], 10
; CHECK-NEXT: [[M:%.*]] = sub nuw nsw i8 11, [[A]]
; CHECK-NEXT: ret i8 [[M]]
;
%a = and i8 %x, 10 ; 0b00001010
%m = sub i8 11, %a ; 0b00001011
ret i8 %m
}
define <2 x i5> @masked_sub_v2i5(<2 x i5> %x) {
; CHECK-LABEL: @masked_sub_v2i5(
; CHECK-NEXT: [[A:%.*]] = and <2 x i5> [[X:%.*]], <i5 -8, i5 -8>
; CHECK-NEXT: [[M:%.*]] = sub nuw nsw <2 x i5> <i5 -6, i5 -6>, [[A]]
; CHECK-NEXT: ret <2 x i5> [[M]]
;
%a = and <2 x i5> %x, <i5 24, i5 24> ; 0b11000
%m = sub <2 x i5> <i5 26, i5 26>, %a ; 0b11010
ret <2 x i5> %m
}
define i8 @not_masked_sub_i8(i8 %x) {
; CHECK-LABEL: @not_masked_sub_i8(
; CHECK-NEXT: [[A:%.*]] = and i8 [[X:%.*]], 7
; CHECK-NEXT: [[M:%.*]] = sub nuw nsw i8 11, [[A]]
; CHECK-NEXT: ret i8 [[M]]
;
%a = and i8 %x, 7 ; 0b00000111
%m = sub i8 11, %a ; 0b00001011
ret i8 %m
}
declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
define i32 @test2(i32 %x) nounwind {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[COUNT:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[X:%.*]], i1 true) [[ATTR2:#.*]], [[RNG0:!range !.*]]
; CHECK-NEXT: [[COUNT:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[X:%.*]], i1 true) #[[ATTR2:[0-9]+]], !range [[RNG0:![0-9]+]]
; CHECK-NEXT: [[SUB:%.*]] = xor i32 [[COUNT]], 31
; CHECK-NEXT: ret i32 [[SUB]]
;