https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
Alexander Monakov changed:
What|Removed |Added
CC||amonakov at gcc dot gnu.org
---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #7 from Jan Hubicka ---
Thanks a lot! There however still seems to be problem with vectorization
On zen4 i now get:
jh@ryzen4:~/gcc/build/gcc> ./xgcc -B ./ -O2 -march=native slp.c ; perf stat
./a.out
Performance counter stats
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #6 from Uroš Bizjak ---
The missing pattern was committed as part of:
commit r14-493-g919642fa4b2bc4c32910336dd200d53766801c80
Author: Uros Bizjak
Date: Fri May 5 14:10:18 2023 +0200
i386: Introduce mulv2si3 instruction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #5 from Uroš Bizjak ---
Created attachment 55002
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55002=edit
Patch that introduces mulv2si3
The compiled code with -march=znver1 is now the same as without the flag:
loop:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
Richard Biener changed:
What|Removed |Added
Ever confirmed|0 |1
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #3 from Andrew Pinski ---
So in the case of without -march, we get:
first:
/app/example.cpp:14:24: note: Cost model analysis for part in loop 0:
Vector cost: 28
Scalar cost: 24
so we reject that and then we try it again and
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #2 from Andrew Pinski ---
Even more interesting is:
for (int i = 0; i < 3; i++)
a[i] = ((unsigned)a[i]) << 1;
Produces different code .
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109690
--- Comment #1 from Andrew Pinski ---
Without -march=znver1, we get:
vect__10.6_9 = MEM [(int *)];
vect_patt_13.7_8 = VIEW_CONVERT_EXPR(vect__10.6_9);
vect_patt_19.8_1 = vect_patt_13.7_8 << 1;
vect_patt_25.9_2 =
