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).
