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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94617] Simple if condition not optimized
Date: Thu, 16 Apr 2020 12:17:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94617

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
IIRC you can also express the range test this way:

const char* vanilla_bandpass(int a, int b, int x, const char* low, const ch=
ar*
high)
{
  const bool within_interval { (unsigned long)x - a < (unsigned long)b - a =
};
  return (within_interval ? high : low);
}

which gives you

_Z16vanilla_bandpassiiiPKcS0_:
.LFB0:
        .cfi_startproc
        movslq  %edi, %rdi
        movslq  %edx, %rdx
        movslq  %esi, %rsi
        movq    %rcx, %rax
        subq    %rdi, %rdx
        subq    %rdi, %rsi
        cmpq    %rsi, %rdx
        cmovb   %r8, %rax
        ret=