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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94683] New: ICE in forwprop when folding to a
 VEC_PERM_EXPR
Date: Tue, 21 Apr 2020 09:03:11 +0000
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X-Bugzilla-Version: 10.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94683

            Bug ID: 94683
           Summary: ICE in forwprop when folding to a VEC_PERM_EXPR
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rsandifo at gcc dot gnu.org
  Target Milestone: ---

Compiling this with -march=3Darmv8.2-a+sve -msve-vector-bits=3D256 -O3:

#include <arm_sve.h>

typedef float v8sf __attribute__((vector_size(32)));

svfloat32_t
f (svbool_t pg, svfloat32_t x, svfloat32_t y)
{
  v8sf a =3D svadd_x (pg, x, 1);
  v8sf b =3D { a[0], a[0], a[2], a[2], a[4], a[4], a[6], a[6] };
  return svdiv_x (pg, b, y);
}

gives:

foo.c: In function =E2=80=98f=E2=80=99:
foo.c:16:1: error: non-trivial conversion in =E2=80=98ssa_name=E2=80=99
   16 | }
      | ^
v8sf
__SVFloat32_t
b_17 =3D _16;
during GIMPLE pass: forwprop
dump file: foo.031t.forwprop1=