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* [Bug c/111751] New: RISC-V: RVV unexpected vectorization
@ 2023-10-10  3:19 juzhe.zhong at rivai dot ai
  2023-10-10  3:35 ` [Bug tree-optimization/111751] " pinskia at gcc dot gnu.org
                   ` (20 more replies)
  0 siblings, 21 replies; 22+ messages in thread
From: juzhe.zhong at rivai dot ai @ 2023-10-10  3:19 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111751

            Bug ID: 111751
           Summary: RISC-V: RVV unexpected vectorization
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: juzhe.zhong at rivai dot ai
  Target Milestone: ---

#include <stdlib.h>

#define N 16

int main ()
{
  int i;
  char ia[N];
  char ic[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  char ib[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};

  /* Not vectorizable, multiplication */
  for (i = 0; i < N; i++)
    {
      ia[i] = ib[i] * ic[i];
    }

  /* check results:  */
  for (i = 0; i < N; i++)
    {
      if (ia[i] != (char) (ib[i] * ic[i]))
        abort ();
    }

  return 0;
}

RVV GCC ASM:

main:
        lui     a5,%hi(.LANCHOR0)
        addi    a5,a5,%lo(.LANCHOR0)
        addi    sp,sp,-48
        ld      a4,0(a5)
        ld      a5,8(a5)
        sd      a5,8(sp)
        sd      a5,24(sp)
        sd      ra,40(sp)
        addi    a5,sp,16
        sd      a4,0(sp)
        sd      a4,16(sp)
        vsetivli        zero,16,e8,m1,ta,ma
        vle8.v  v1,0(a5)
        vle8.v  v2,0(sp)
        vmul.vv v1,v1,v2
        vmv.x.s a5,v1
        andi    a5,a5,0xff
        bne     a5,zero,.L2
        vslidedown.vi   v2,v1,1
        li      a4,9
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,2
        li      a4,36
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,3
        li      a4,81
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,4
        li      a4,144
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,5
        li      a4,225
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,6
        li      a4,68
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,7
        li      a4,185
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,8
        li      a4,64
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,9
        li      a4,217
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,10
        li      a4,132
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,11
        li      a4,65
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,12
        li      a4,16
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,13
        li      a4,241
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v2,v1,14
        li      a4,228
        vmv.x.s a5,v2
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        vslidedown.vi   v1,v1,15
        li      a4,233
        vmv.x.s a5,v1
        andi    a5,a5,0xff
        bne     a5,a4,.L2
        ld      ra,40(sp)
        li      a0,0
        addi    sp,sp,48
        jr      ra
.L2:
        call    abort


ARM SVE GCC:

main:
        mov     w0, 0
        ret

^ permalink raw reply	[flat|nested] 22+ messages in thread
end of thread, other threads:[~2023-10-10 12:48 UTC | newest]

Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-10-10  3:19 [Bug c/111751] New: RISC-V: RVV unexpected vectorization juzhe.zhong at rivai dot ai
2023-10-10  3:35 ` [Bug tree-optimization/111751] " pinskia at gcc dot gnu.org
2023-10-10  3:35 ` pinskia at gcc dot gnu.org
2023-10-10  3:36 ` pinskia at gcc dot gnu.org
2023-10-10  3:41 ` pinskia at gcc dot gnu.org
2023-10-10  3:51 ` juzhe.zhong at rivai dot ai
2023-10-10  3:55 ` pinskia at gcc dot gnu.org
2023-10-10  4:00 ` juzhe.zhong at rivai dot ai
2023-10-10  9:09 ` rguenth at gcc dot gnu.org
2023-10-10  9:24 ` juzhe.zhong at rivai dot ai
2023-10-10  9:32 ` rguenther at suse dot de
2023-10-10 10:38 ` cvs-commit at gcc dot gnu.org
2023-10-10 10:50 ` rguenth at gcc dot gnu.org
2023-10-10 11:17 ` juzhe.zhong at rivai dot ai
2023-10-10 11:23 ` juzhe.zhong at rivai dot ai
2023-10-10 11:40 ` juzhe.zhong at rivai dot ai
2023-10-10 11:49 ` rguenth at gcc dot gnu.org
2023-10-10 11:50 ` cvs-commit at gcc dot gnu.org
2023-10-10 11:56 ` juzhe.zhong at rivai dot ai
2023-10-10 12:20 ` cvs-commit at gcc dot gnu.org
2023-10-10 12:22 ` cvs-commit at gcc dot gnu.org
2023-10-10 12:47 ` juzhe.zhong at rivai dot ai

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