1 files changed, 27 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/overflow.ll b/test/Transforms/InstCombine/overflow.ll
new file mode 100644
index 0000000000..f3f8ca3d61
--- /dev/null
+++ b/test/Transforms/InstCombine/overflow.ll
@@ -0,0 +1,27 @@
+; RUN: opt -S -instcombine < %s | FileCheck %s
+; <rdar://problem/8558713>
+
+; CHECK: @test1
+define i32 @test1(i32 %a, i32 %b) nounwind ssp {
+entry:
+; CHECK-NOT: sext
+  %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: 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:
+; CHECK-NOT: trunc
+  %conv9 = trunc i64 %add to i32
+; CHECK: ret i32
+  ret i32 %conv9
+}
+
+declare i32 @throwAnExceptionOrWhatever(...)