[Bug target/48607] New: Inefficient complex float parameter passing

["hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48607

           Summary: Inefficient complex float parameter passing
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com
                CC: ubizjak@gmail.com


[hjl@gnu-6 pr1000]$ cat z.i 
typedef _Complex float SCtype;
SCtype
foo (SCtype x1, SCtype x2, SCtype x3, SCtype x4, SCtype x5, SCtype x6,
     SCtype x7, SCtype x8, SCtype a, SCtype b)
{
  return x2;
}
[hjl@gnu-6 pr1000]$ /usr/gcc-4.7/bin/gcc -O2 -S z.i
[hjl@gnu-6 pr1000]$ cat z.s
    .file    "z.i"
    .text
    .p2align 4,,15
    .globl    foo
    .type    foo, @function
foo:
.LFB0:
    .cfi_startproc
    movq    %xmm1, -16(%rsp)
    movl    -16(%rsp), %eax
    movl    %eax, -72(%rsp)
    movl    -12(%rsp), %eax
    movl    %eax, -68(%rsp)
    movq    -72(%rsp), %xmm0
    ret
    .cfi_endproc
.LFE0:
    .size    foo, .-foo
    .ident    "GCC: (GNU) 4.7.0 20110406 (experimental) [trunk revision
172062]"
    .section    .note.GNU-stack,"",@progbits
[hjl@gnu-6 pr1000]$ 

We should simply do

movaps    %xmm1, %xmm0  

or

movq   %xmm1,%xmm0