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[InstCombine] add tests for andn; NFC 

llvm-svn: 302599
This commit is contained in:
Sanjay Patel 2017-05-09 23:40:13 +00:00
parent 4b62b5cddd
commit a06384f3d8
1 changed files with 28 additions and 0 deletions
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28
llvm/test/Transforms/InstCombine/add.ll
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@ -27,6 +27,34 @@ define <2 x i32> @select_0_or_1_from_bool_vec(<2 x i1> %x) {
ret <2 x i32> %add
}
; This is an 'andn' of the low bit.
define i32 @flip_and_mask(i32 %x) {
; CHECK-LABEL: @flip_and_mask(
; CHECK-NEXT: [[SHL:%.*]] = shl i32 %x, 31
; CHECK-NEXT: [[SHR:%.*]] = ashr exact i32 [[SHL]], 31
; CHECK-NEXT: [[INC:%.*]] = add nsw i32 [[SHR]], 1
; CHECK-NEXT: ret i32 [[INC]]
;
%shl = shl i32 %x, 31
%shr = ashr i32 %shl, 31
%inc = add i32 %shr, 1
ret i32 %inc
}
define <2 x i8> @flip_and_mask_splat(<2 x i8> %x) {
; CHECK-LABEL: @flip_and_mask_splat(
; CHECK-NEXT: [[SHL:%.*]] = shl <2 x i8> %x, <i8 7, i8 7>
; CHECK-NEXT: [[SHR:%.*]] = ashr exact <2 x i8> [[SHL]], <i8 7, i8 7>
; CHECK-NEXT: [[INC:%.*]] = add nsw <2 x i8> [[SHR]], <i8 1, i8 1>
; CHECK-NEXT: ret <2 x i8> [[INC]]
;
%shl = shl <2 x i8> %x, <i8 7, i8 7>
%shr = ashr <2 x i8> %shl, <i8 7, i8 7>
%inc = add <2 x i8> %shr, <i8 1, i8 1>
ret <2 x i8> %inc
}
define i32 @test1(i32 %A) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret i32 %A