[Bug target/53425] New: No warnings are given for -mno-sse

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53425

             Bug #: 53425
           Summary: No warnings are given for -mno-sse
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: hjl.to...@gmail.com
                CC: ubiz...@gmail.com
            Target: x86-64


[hjl@gnu-mic-2 pr53383]$ cat z.c
typedef double __v2df __attribute__ ((__vector_size__ (16)));

extern __v2df x;

extern void bar (__v2df);
void
foo (void)
{
  bar (x);
}
[hjl@gnu-mic-2 pr53383]$ make z.s
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -O2 -mno-sse -S z.c
[hjl@gnu-mic-2 pr53383]$ cat z.s
    .file    "z.c"
    .text
    .p2align 4,,15
    .globl    foo
    .type    foo, @function
foo:
.LFB0:
    .cfi_startproc
    subq    $40, %rsp
    .cfi_def_cfa_offset 48
    movq    x(%rip), %rax
    movq    %rax, (%rsp)
    movq    x+8(%rip), %rax
    movq    %rax, 8(%rsp)
    call    bar
    addq    $40, %rsp
    .cfi_def_cfa_offset 8
    ret
    .cfi_endproc
.LFE0:
    .size    foo, .-foo
    .ident    "GCC: (GNU) 4.8.0 20120519 (experimental)"
    .section    .note.GNU-stack,"",@progbits
[hjl@gnu-mic-2 pr53383]$ 

But we do issue a warning for 32-bit:

[hjl@gnu-mic-2 pr53383]$ /export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -O2 -mno-sse -S z.c -m32
z.c: In function \u2018foo\u2019:
z.c:9:7: warning: SSE vector argument without SSE enabled changes the ABI
[enabled by default]
   bar (x);
       ^
z.c:9:7: note: The ABI for passing parameters with 16-byte alignment has
changed in GCC 4.6
[hjl@gnu-mic-2 pr53383]$ 

I believe we should also issue a warning for 64-bit.