diff options
| author | Eli Friedman <eli.friedman@gmail.com> | 2010-06-03 03:49:50 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2010-06-03 03:49:50 +0000 |
| commit | 268637ed0f34e10e4125e94c44ff3e2975a19166 (patch) | |
| tree | 610f0a9753ebeb3ed25fd52c3e281b60d66c0a3e /test/CodeGen/Generic | |
| parent | db1bf34178aec96559cf2e7190accc484c85d3e2 (diff) | |
| download | external_llvm-268637ed0f34e10e4125e94c44ff3e2975a19166.zip external_llvm-268637ed0f34e10e4125e94c44ff3e2975a19166.tar.gz external_llvm-268637ed0f34e10e4125e94c44ff3e2975a19166.tar.bz2 | |
Implement expansion in type legalization for add/sub with overflow. The
expansion is the same as that used by LegalizeDAG.
The resulting code sucks in terms of performance/codesize on x86-32 for a
64-bit operation; I haven't looked into whether different expansions might be
better in general.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105378 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/Generic')
| -rw-r--r-- | test/CodeGen/Generic/add-with-overflow-128.ll | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/test/CodeGen/Generic/add-with-overflow-128.ll b/test/CodeGen/Generic/add-with-overflow-128.ll new file mode 100644 index 0000000..c46c820 --- /dev/null +++ b/test/CodeGen/Generic/add-with-overflow-128.ll @@ -0,0 +1,42 @@ +; RUN: llc < %s + +@ok = internal constant [4 x i8] c"%d\0A\00" +@no = internal constant [4 x i8] c"no\0A\00" + +define i1 @func1(i128 signext %v1, i128 signext %v2) nounwind { +entry: + %t = call {i128, i1} @llvm.sadd.with.overflow.i128(i128 %v1, i128 %v2) + %sum = extractvalue {i128, i1} %t, 0 + %sum32 = trunc i128 %sum to i32 + %obit = extractvalue {i128, 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 %sum32 ) 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(i128 zeroext %v1, i128 zeroext %v2) nounwind { +entry: + %t = call {i128, i1} @llvm.uadd.with.overflow.i128(i128 %v1, i128 %v2) + %sum = extractvalue {i128, i1} %t, 0 + %sum32 = trunc i128 %sum to i32 + %obit = extractvalue {i128, 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 %sum32 ) 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 {i128, i1} @llvm.sadd.with.overflow.i128(i128, i128) +declare {i128, i1} @llvm.uadd.with.overflow.i128(i128, i128) |