[Bug target/88778] Odd Complex value load

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88778

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-01-11
     Ever confirmed|0                           |1

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
More examples:

[hjl@gnu-cfl-1 pr88778]$ cat z.i
_Complex float
foo (_Complex float x)
{
  return x;
}
[hjl@gnu-cfl-1 pr88778]$ make z.s
/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/ -O2  -S z.i
[hjl@gnu-cfl-1 pr88778]$ cat z.s
        .file   "z.i"
        .text
        .p2align 4
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        movq    %xmm0, -8(%rsp)
        movss   -8(%rsp), %xmm0
        movss   %xmm0, -16(%rsp)
        movss   -4(%rsp), %xmm0
        movss   %xmm0, -12(%rsp)
        movq    -16(%rsp), %xmm0
        ret
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 9.0.0 20190110 (experimental)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 pr88778]$ cat x.i
typedef float __v4sf __attribute__ ((__vector_size__ (16)));
typedef float __m128 __attribute__ ((__vector_size__ (16), __may_alias__));

__m128
foo (_Complex float x)
{
  return __extension__ (__m128)(__v4sf) { __real x, __imag x,
                                          0.0, 0.0f };
}
[hjl@gnu-cfl-1 pr88778]$ make x.s
/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/ -O2  -S x.i
[hjl@gnu-cfl-1 pr88778]$ cat x.s
        .file   "x.i"
        .text
        .p2align 4
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        movq    %xmm0, -16(%rsp)
        movss   -12(%rsp), %xmm0
        movss   -16(%rsp), %xmm1
        unpcklps        %xmm0, %xmm1
        movq    %xmm1, %xmm0
        ret
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 9.0.0 20190110 (experimental)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 pr88778]$