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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103194] [12 Regression] ice in
 optimize_atomic_bit_test_and with __sync_fetch_and_and since
 r12-5102-gfb161782545224f5
Date: Mon, 15 Nov 2021 02:47:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103194

Hongtao.liu <crazylht at gmail dot com> changed:

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

--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
unsigned long pscc_a_2_3;
int pscc_a_1_4;
unsigned long pc2;
void pscc(int n)
{
  long mask =3D 1ll << n;
  pc2 =3D __sync_fetch_and_or(&pscc_a_2_3, mask) & mask;
}

void pscc1(int n)
{
  long mask =3D 1ll << 65;
  pc2 =3D __sync_fetch_and_or(&pscc_a_2_3, mask) & mask;
}

pscc and pscc1 have different behavior when n >=3D 64, It seems unsafe to
optimize variable mask?=