| commit cc8f98198799fe3a5f00e2fc0edcb5d90c124d2f |
| Author: Sanjay Patel <spatel@rotateright.com> |
| Date: Wed Mar 9 17:18:35 2022 -0500 |
| |
| [InstCombine] add tests to show miscompiled smin/smax; NFC |
| |
| diff --git a/llvm/test/Transforms/InstCombine/select-min-max.ll b/llvm/test/Transforms/InstCombine/select-min-max.ll |
| index b285c7ee54b4..04dc62ec2f92 100644 |
| --- a/llvm/test/Transforms/InstCombine/select-min-max.ll |
| +++ b/llvm/test/Transforms/InstCombine/select-min-max.ll |
| @@ -249,3 +249,51 @@ define i8 @umin_umax(i8 %x) { |
| %s = select i1 %c, i8 %m, i8 126 |
| ret i8 %s |
| } |
| + |
| +define i8 @not_smax(i8 %i41, i8 %i43) { |
| +; CHECK-LABEL: @not_smax( |
| +; CHECK-NEXT: [[I46:%.*]] = sub nsw i8 [[I41:%.*]], [[I43:%.*]] |
| +; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.smax.i8(i8 [[I46]], i8 0) |
| +; CHECK-NEXT: ret i8 [[TMP1]] |
| +; |
| + %i44 = icmp slt i8 %i41, %i43 |
| + %i46 = sub nsw i8 %i41, %i43 |
| + %spec.select = select i1 %i44, i8 0, i8 %i46 |
| + ret i8 %spec.select |
| +} |
| + |
| +define i8 @not_smax_swap(i8 %i41, i8 %i43) { |
| +; CHECK-LABEL: @not_smax_swap( |
| +; CHECK-NEXT: [[I46:%.*]] = sub nsw i8 [[I41:%.*]], [[I43:%.*]] |
| +; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.smax.i8(i8 [[I46]], i8 0) |
| +; CHECK-NEXT: ret i8 [[TMP1]] |
| +; |
| + %i44 = icmp sgt i8 %i41, %i43 |
| + %i46 = sub nsw i8 %i41, %i43 |
| + %spec.select = select i1 %i44, i8 %i46, i8 0 |
| + ret i8 %spec.select |
| +} |
| + |
| +define i8 @not_smin(i8 %i41, i8 %i43) { |
| +; CHECK-LABEL: @not_smin( |
| +; CHECK-NEXT: [[I46:%.*]] = sub nsw i8 [[I41:%.*]], [[I43:%.*]] |
| +; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.smin.i8(i8 [[I46]], i8 0) |
| +; CHECK-NEXT: ret i8 [[TMP1]] |
| +; |
| + %i44 = icmp sgt i8 %i41, %i43 |
| + %i46 = sub nsw i8 %i41, %i43 |
| + %spec.select = select i1 %i44, i8 0, i8 %i46 |
| + ret i8 %spec.select |
| +} |
| + |
| +define i8 @not_smin_swap(i8 %i41, i8 %i43) { |
| +; CHECK-LABEL: @not_smin_swap( |
| +; CHECK-NEXT: [[I46:%.*]] = sub nsw i8 [[I41:%.*]], [[I43:%.*]] |
| +; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.smin.i8(i8 [[I46]], i8 0) |
| +; CHECK-NEXT: ret i8 [[TMP1]] |
| +; |
| + %i44 = icmp slt i8 %i41, %i43 |
| + %i46 = sub nsw i8 %i41, %i43 |
| + %spec.select = select i1 %i44, i8 %i46, i8 0 |
| + ret i8 %spec.select |
| +} |