https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107093
--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
change "*k, CBC" to "?k, CBC", in *mov{qi,hi,si,di}_internal.
then RA works good to choose kxnor for setting constm1_rtx to mask register,
and i got below with your attached patch(change #if 0 to #if 1), seems better
than orginal patch.
6foo:
7.LFB0:
8 .cfi_startproc
9 testl %edi, %edi
10 jle .L9
11 kxnorb %k1, %k1, %k1
12 cmpl $4, %edi
13 jl .L11
14.L3:
15 vbroadcastsd .LC2(%rip), %ymm3
16 vmovdqa .LC0(%rip), %xmm2
17 xorl %eax, %eax
18 xorl %ecx, %ecx
19 .p2align 4,,10
20 .p2align 3
21.L7:
22 vmovapd b(%rax), %ymm0{%k1}
23 addl $4, %ecx
24 movl %edi, %edx
25 vmulpd %ymm3, %ymm0, %ymm1
26 subl %ecx, %edx
27 cmpl $4, %edx
28 vmovapd %ymm1, a(%rax){%k1}
29 vpbroadcastd %edx, %xmm1
30 movl $-1, %edx
31 vpcmpd $1, %xmm1, %xmm2, %k1
32 kmovb %k1, %esi
33 cmovge %edx, %esi
34 addq $32, %rax
35 kmovb %esi, %k1
36 kortestb %k1, %k1
37 jne .L7
38 vzeroupper
39.L9:
40 ret
41 .p2align 4,,10
42 .p2align 3
43.L11:
44 vmovdqa .LC0(%rip), %xmm2
45 vpbroadcastd %edi, %xmm1
46 vpcmpd $1, %xmm1, %xmm2, %k1
47 jmp .L3
48 .cfi_endproc
