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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107671] New: i386: Missed optimization: use of bt in bit
 test pattern when LHS is an array index
Date: Mon, 14 Nov 2022 03:38:34 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ibuclaw at gdcproject dot org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107671

            Bug ID: 107671
           Summary: i386: Missed optimization: use of bt in bit test
                    pattern when LHS is an array index
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

int bt32_setb(const __UINT32_TYPE__ *p, __UINT32_TYPE__ bitnum)
{
    return ((p[bitnum >> 5] & (1  << (bitnum & 31)))) !=3D 0;
}

int bt64_setb(const __UINT64_TYPE__ *p, __UINT64_TYPE__ bitnum)
{
    return ((p[bitnum >> 6] & (1L << (bitnum & 63)))) !=3D 0;
}

int bt32_setb2(const __UINT32_TYPE__ *p, __UINT32_TYPE__ bitnum)
{
    return (p[bitnum >> 5] >> (bitnum & 31)) & 1;
}

int bt64_setb2(const __UINT64_TYPE__ *p, __UINT64_TYPE__ bitnum)
{
    return (p[bitnum >> 6] >> (bitnum & 63)) & 1;
}

int bt32_setae(const __UINT32_TYPE__ *p, __UINT32_TYPE__ bitnum)
{
    return ((p[bitnum >> 5] & (1  << (bitnum & 31)))) =3D=3D 0;
}

int bt64_setae(const __UINT64_TYPE__ *p, __UINT64_TYPE__ bitnum)
{
    return ((p[bitnum >> 6] & (1L << (bitnum & 63)))) =3D=3D 0;
}

int bt32_setae2(const __UINT32_TYPE__ *p, __UINT32_TYPE__ bitnum)
{
    return !((p[bitnum >> 5] >> (bitnum & 31)) & 1);
}

int bt64_setae2(const __UINT64_TYPE__ *p, __UINT64_TYPE__ bitnum)
{
    return !((p[bitnum >> 6] >> (bitnum & 63)) & 1);
}=