+is compiled into:
+
+_qux:
+ subl $28, %esp
+ movl 32(%esp), %eax
+ movd %eax, %mm0
+ movq %mm0, (%esp)
+ movl (%esp), %eax
+ movl %eax, 20(%esp)
+ movq %mm0, 8(%esp)
+ movl 12(%esp), %eax
+ movl %eax, 16(%esp)
+ movq 16(%esp), %mm0
+ addl $28, %esp
+ ret
+
+Yuck!
+
+GCC gives us:
+
+_qux:
+ subl $12, %esp
+ movl 16(%esp), %eax
+ movl 20(%esp), %edx
+ movl $0, (%eax)
+ movl %edx, 4(%eax)
+ addl $12, %esp
+ ret $4
+
+//===---------------------------------------------------------------------===//
+
+We generate crappy code for this:
+
+__m64 t() {
+ return _mm_cvtsi32_si64(1);
+}