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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96244] New: Redudant mask load generated
Date: Mon, 20 Jul 2020 03:38:49 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: crazylht at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96244

            Bug ID: 96244
           Summary: Redudant mask load generated
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
  Target Milestone: ---

cat test.c

---
typedef int v8si __attribute__ ((__vector_size__ (32)));
v8si
foo (v8si a, v8si b, v8si c, v8si d)
{
  v8si e;
    for (int i =3D 0; i !=3D 8; i++)
     e[i] =3D a[i] > b[i] ? c[i] : d[i];
    return e;
}
---

gcc -Ofast -mavx2 test.c

cat test.c.238t.optimized
---
foo (v8si a, v8si b, v8si c, v8si d)
{
  vector(8) int vect_iftmp.19;
  vector(8) int vect_iftmp.18;
  vector(8) <signed-boolean:32> mask__31.15;
  vector(8) int vect_iftmp.14;
  vector(8) <signed-boolean:32> mask__28.11;

  <bb 2> [local count: 119292720]:
  mask__28.11_40 =3D b_50(D) < a_53(D);
  vect_iftmp.14_43 =3D .MASK_LOAD (&c, 32B, mask__28.11_40); ---> redundant
  mask__31.15_44 =3D b_50(D) >=3D a_53(D);
  vect_iftmp.18_47 =3D .MASK_LOAD (&d, 32B, mask__31.15_44); ---> redundant
  vect_iftmp.19_49 =3D .VCOND (b_50(D), a_53(D), vect_iftmp.18_47,
vect_iftmp.14_43, 110);
  return vect_iftmp.19_49;
---

could be optimized to=20
---
vect_iftmp.19_49 =3D .VCOND (b_50(D), a_53(D), d, c);
---=