diff options
| author | Bill Wendling <isanbard@gmail.com> | 2008-12-09 22:08:41 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2008-12-09 22:08:41 +0000 |
| commit | 74c376529101acbe141a256d0bf23a44eb454c84 (patch) | |
| tree | 1876d85236de9f0268a586dcedb5e9cfb6d4167d /test/CodeGen/X86/sub-with-overflow.ll | |
| parent | bc99be10b815e0bfc5102bd5746e9a80feebf6f4 (diff) | |
| download | external_llvm-74c376529101acbe141a256d0bf23a44eb454c84.zip external_llvm-74c376529101acbe141a256d0bf23a44eb454c84.tar.gz external_llvm-74c376529101acbe141a256d0bf23a44eb454c84.tar.bz2 | |
Add sub/mul overflow intrinsics. This currently doesn't have a
target-independent way of determining overflow on multiplication. It's very
tricky. Patch by Zoltan Varga!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60800 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/sub-with-overflow.ll')
| -rw-r--r-- | test/CodeGen/X86/sub-with-overflow.ll | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/test/CodeGen/X86/sub-with-overflow.ll b/test/CodeGen/X86/sub-with-overflow.ll new file mode 100644 index 0000000..f51fc21 --- /dev/null +++ b/test/CodeGen/X86/sub-with-overflow.ll @@ -0,0 +1,41 @@ +; RUN: llvm-as < %s | llc -march=x86 | grep {jo} | count 1 +; RUN: llvm-as < %s | llc -march=x86 | grep {jc} | count 1 + +@ok = internal constant [4 x i8] c"%d\0A\00" +@no = internal constant [4 x i8] c"no\0A\00" + +define i1 @func1(i32 %v1, i32 %v2) nounwind { +entry: + %t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %v1, i32 %v2) + %sum = extractvalue {i32, i1} %t, 0 + %obit = extractvalue {i32, i1} %t, 1 + br i1 %obit, label %overflow, label %normal + +normal: + %t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum ) nounwind + ret i1 true + +overflow: + %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind + ret i1 false +} + +define i1 @func2(i32 %v1, i32 %v2) nounwind { +entry: + %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %v1, i32 %v2) + %sum = extractvalue {i32, i1} %t, 0 + %obit = extractvalue {i32, i1} %t, 1 + br i1 %obit, label %carry, label %normal + +normal: + %t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum ) nounwind + ret i1 true + +carry: + %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind + ret i1 false +} + +declare i32 @printf(i8*, ...) nounwind +declare {i32, i1} @llvm.ssub.with.overflow.i32(i32, i32) +declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) |