diff options
Diffstat (limited to 'test/Transforms/InstCombine')
| -rw-r--r-- | test/Transforms/InstCombine/overflow.ll | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/test/Transforms/InstCombine/overflow.ll b/test/Transforms/InstCombine/overflow.ll index e54d315..da20e2c 100644 --- a/test/Transforms/InstCombine/overflow.ll +++ b/test/Transforms/InstCombine/overflow.ll @@ -11,7 +11,7 @@ entry: %conv2 = sext i32 %b to i64 %add = add nsw i64 %conv2, %conv %add.off = add i64 %add, 2147483648 -; CHECK: llvm.sadd.with.overflow +; CHECK: llvm.sadd.with.overflow.i32 %0 = icmp ugt i64 %add.off, 4294967295 br i1 %0, label %if.then, label %if.end @@ -53,3 +53,24 @@ if.end: ret i32 %conv9 } +; CHECK: test3 +; This is illegal to transform because the high bits of the original add are +; live out. +define i64 @test3(i32 %a, i32 %b) nounwind ssp { +entry: + %conv = sext i32 %a to i64 + %conv2 = sext i32 %b to i64 + %add = add nsw i64 %conv2, %conv + %add.off = add i64 %add, 2147483648 +; CHECK-NOT: llvm.sadd.with.overflow + %0 = icmp ugt i64 %add.off, 4294967295 + br i1 %0, label %if.then, label %if.end + +if.then: + %call = tail call i32 (...)* @throwAnExceptionOrWhatever() nounwind + br label %if.end + +if.end: + ret i64 %add +; CHECK: ret i64 +} |