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From: "Explorer09 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/115674] New: "Checking if number is within
 interval" missed optimization when number is from a smaller int type
Date: Thu, 27 Jun 2024 04:58:48 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 14.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: Explorer09 at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115674

            Bug ID: 115674
           Summary: "Checking if number is within interval" missed
                    optimization when number is from a smaller int type
           Product: gcc
           Version: 14.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Explorer09 at gmail dot com
  Target Milestone: ---

```c
#include <stdbool.h>
#include <stdint.h>
bool func1(uint8_t x) {
    uint32_t value;
    value =3D x;
    if (value < 0xC2 || value > 0xF4) {
        return false;
    }
    return true;
}

bool func2(uint8_t x) {
    uint32_t value;
    value =3D x;
    if ((uint8_t)value < 0xC2 || (uint8_t)value > 0xF4) {
        return false;
    }
    return true;
}
```

x86_64 gcc with -Os option produces:

```x86asm
func1:
    movzx   edi, dil
    sub     edi, 194
    cmp     edi, 50
    setbe   al
    ret
func2:
    add     edi, 62
    cmp     dil, 50
    setbe   al
    ret
```

For x86-64, the expected result is func1 transformed to func2.

For ARM and RISC-V targets, I expect the other way around, that is, transfo=
rm
func2 to func1, so that it saves a "bitwise AND 0xFF" operation.=