diff options
Diffstat (limited to 'llvm/test/Transforms/InstCombine/add.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/add.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/add.ll b/llvm/test/Transforms/InstCombine/add.ll index 648305d134c..955ffaaeecd 100644 --- a/llvm/test/Transforms/InstCombine/add.ll +++ b/llvm/test/Transforms/InstCombine/add.ll @@ -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 |
