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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/88842] missing optimization CSE, reassociation
Date: Fri, 15 May 2020 03:25:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88842

luoxhu at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luoxhu at gcc dot gnu.org

--- Comment #3 from luoxhu at gcc dot gnu.org ---
One more case of missed optimization CSE, reassoc:

void foo(unsigned int a, unsigned int b, unsigned int c, unsigned int d, int
*res1, int*res2, int *res3)
{
  *res1 =3D a + b + c + d;
  *res2 =3D b + c;
  *res3 =3D a + d;
}

cat foo.s
        .file   "foo.c"
        .machine power8
        .abiversion 2
        .section        ".text"
        .align 2
        .p2align 4,,15
        .globl foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        add 10,5,6
        add 10,10,4
        add 4,4,5
        add 10,10,3
        add 3,3,6
        stw 10,0(7)
        stw 4,0(8)
        stw 3,0(9)
        blr=