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| 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 | db8ec2d75a90ef7f0b8ab8b0e5bc78075c4dbe5c (patch) | |
| tree | 843d7a6d39783475665f6d334f01c0515e5d93d1 /llvm/test/CodeGen/X86/sub-with-overflow.ll | |
| parent | fa9f99aa128266f9b742648884a3be5549fd8e8b (diff) | |
| download | bcm5719-llvm-db8ec2d75a90ef7f0b8ab8b0e5bc78075c4dbe5c.tar.gz bcm5719-llvm-db8ec2d75a90ef7f0b8ab8b0e5bc78075c4dbe5c.zip | |
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!
llvm-svn: 60800
Diffstat (limited to 'llvm/test/CodeGen/X86/sub-with-overflow.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/sub-with-overflow.ll | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/sub-with-overflow.ll b/llvm/test/CodeGen/X86/sub-with-overflow.ll new file mode 100644 index 00000000000..f51fc210819 --- /dev/null +++ b/llvm/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) |
