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From: "guihaoc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108004] x-form logical operations with dot instructions
 are not emitted.
Date: Wed, 07 Dec 2022 08:38:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108004

--- Comment #4 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
$cat asm_test.c
#include <stdio.h>

unsigned long foo() {
  unsigned long res;
  __asm__ ("li 3,0xffffffffffffffff\n\t"
           "li 4,0xfffffffffffffff1\n\t"
           "and. 3,3,4\n\t"
           "mfcr %0"
           : "=3Dr" (res));
  return res;
}

void
main()
{
  printf ("%lx\n", foo());
}
$ gcc -O1 -o asm_test asm_test.c && ./asm_test
82000482

Use the assembly to test the "and.". The bit32 (cr0 LT bit) is set when the
result is less than 0.=