[Bug target/105504] Fails to break dependency for vcvtss2sd xmm, xmm, mem

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105504

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
After set remove_partial_avx_dependency to true for register alternative, we
get

       vxorps  %xmm3, %xmm3, %xmm3
        vmovsd  .LC16(%rip), %xmm6
        vmovsd  .LC14(%rip), %xmm5
        vcvtss2sd       %xmm0, %xmm3, %xmm0
        vmulsd  .LC12(%rip), %xmm0, %xmm1
        vroundsd        $9, %xmm1, %xmm3, %xmm2
        vcvttsd2siq     %xmm2, %rax
        vsubsd  %xmm2, %xmm1, %xmm1
        vfmadd231sd     .LC13(%rip), %xmm0, %xmm1
        vfmadd213sd     .LC17(%rip), %xmm1, %xmm6
        vmovsd  .LC18(%rip), %xmm0
        vfmadd213sd     .LC19(%rip), %xmm1, %xmm0
        vfmadd213sd     .LC15(%rip), %xmm1, %xmm5
        movq    %rax, %rdx
        sarq    $4, %rax
        vmulsd  %xmm1, %xmm1, %xmm4
        addq    $1023, %rax
        andl    $15, %edx
        salq    $52, %rax
        vmovq   %rax, %xmm7
        vmulsd  tb.1(,%rdx,8), %xmm7, %xmm2
        vfmadd132sd     %xmm4, %xmm6, %xmm0
        vmulsd  %xmm2, %xmm1, %xmm1
        vfmadd132sd     %xmm4, %xmm5, %xmm0
        vfmadd132sd     %xmm1, %xmm2, %xmm0
        vcvtsd2ss       %xmm0, %xmm3, %xmm0

Also  
>Also there's a potentially related issue that GCC copies the initial xmm0 value >to eax via stack in the beginning of the function:

This issue disappears(should still be latent after fix).