https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112697
--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Thanks, I can reproduce it. It is pretty tricky though. For instance, just
swapping the mov and the compare is enough to make it fast:
--- d.out.ltrans0.ltrans.slow.s 2023-12-01 18:32:54.255841611 +0300
+++ d.out.ltrans0.ltrans.fast.s 2023-12-01 18:32:20.318668991 +0300
@@ -743,8 +743,8 @@ add_force_to_mom:
.p2align 4,,10
.p2align 3
.L58:
- cmpb $1, -680(%r11,%r12)
movapd %xmm5, %xmm7
+ cmpb $1, -680(%r11,%r12)
jne .L54
xorpd %xmm6, %xmm7
.L54:
