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From: "hiraditya at msn dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101116] New: missed peephole optimization not
 of bitwise and
Date: Fri, 18 Jun 2021 05:17:44 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.1.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101116

            Bug ID: 101116
           Summary: missed peephole optimization not of bitwise and
           Product: gcc
           Version: 11.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hiraditya at msn dot com
  Target Milestone: ---

$ cat test.c

bool foo(unsigned i) {
    return !(i & 1);
}

gcc -O2 test.c -S -o-
foo(unsigned int):
        mov     eax, edi
        not     eax
        and     eax, 1
        ret

clang -O2 test.c -S -o-

foo(unsigned int): # @foo(unsigned int)
  testb $1, %dil
  sete %al
  retq


Ref: https://godbolt.org/z/Tndb1dM8Y=