diff options
| -rw-r--r-- | llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll b/llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll index 987bf7345bb..ad60ad98788 100644 --- a/llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll +++ b/llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll @@ -399,3 +399,36 @@ define i1 @t14_bad(i64 %base, i64 %offset) { %r = and i1 %not_null, %no_underflow ret i1 %r } + +define i1 @base_ult_offset(i8 %base, i8 %offset) { +; CHECK-LABEL: @base_ult_offset( +; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]] +; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]]) +; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0 +; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]] +; CHECK-NEXT: [[R:%.*]] = and i1 [[NO_UNDERFLOW]], [[NOT_NULL]] +; CHECK-NEXT: ret i1 [[R]] +; + %adjusted = sub i8 %base, %offset + call void @use8(i8 %adjusted) + %not_null = icmp ne i8 %adjusted, 0 + %no_underflow = icmp ule i8 %base, %offset + %r = and i1 %no_underflow, %not_null + ret i1 %r +} +define i1 @base_uge_offset(i8 %base, i8 %offset) { +; CHECK-LABEL: @base_uge_offset( +; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]] +; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]]) +; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0 +; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]] +; CHECK-NEXT: [[R:%.*]] = or i1 [[NO_UNDERFLOW]], [[NOT_NULL]] +; CHECK-NEXT: ret i1 [[R]] +; + %adjusted = sub i8 %base, %offset + call void @use8(i8 %adjusted) + %not_null = icmp eq i8 %adjusted, 0 + %no_underflow = icmp ugt i8 %base, %offset + %r = or i1 %no_underflow, %not_null + ret i1 %r +} |
