//===---------------------------------------------------------------------===//
-We currently compile sign_extend_inreg into two shifts:
-
-long foo(long X) {
- return (long)(signed char)X;
-}
-
-becomes:
-
-_foo:
- movl 4(%esp), %eax
- shll $24, %eax
- sarl $24, %eax
- ret
-
-This could be:
-
-_foo:
- movsbl 4(%esp),%eax
- ret
-
-//===---------------------------------------------------------------------===//
-
Consider the expansion of:
uint %test3(uint %X) {
--- /dev/null
+; RUN: llvm-as < %s | llc -march=x86 | grep movsbl
+
+define i32 @foo(i32 %X) nounwind {
+entry:
+ %tmp12 = trunc i32 %X to i8 ; <i8> [#uses=1]
+ %tmp123 = sext i8 %tmp12 to i32 ; <i32> [#uses=1]
+ ret i32 %tmp123
+}
+