In the CBackend, use casts to force integer add, subtract, and
multiply to be done as unsigned, so that they have well defined
behavior on overflow. This fixes PR2408.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/CBackend/pr2408.ll b/test/CodeGen/CBackend/pr2408.ll
new file mode 100644
index 0000000..a16f91b
--- /dev/null
+++ b/test/CodeGen/CBackend/pr2408.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -march=c | grep {\\* ((unsigned int )}
+; PR2408
+
+define i32 @a(i32 %a) {
+entry:
+ %shr = ashr i32 %a, 0 ; <i32> [#uses=1]
+ %shr2 = ashr i32 2, 0 ; <i32> [#uses=1]
+ %mul = mul i32 %shr, %shr2 ; <i32> [#uses=1]
+ %shr4 = ashr i32 2, 0 ; <i32> [#uses=1]
+ %div = sdiv i32 %mul, %shr4 ; <i32> [#uses=1]
+ ret i32 %div
+}