Re: pgsql: Inline CRC computation for small fixed-length input on x86

At Mon, 31 Mar 2025 15:07:36 +0700, John Naylor <johncnaylorls@gmail.com> wrote in 
> Looking at the configure output, I don't see -msee4.2 (or equivalent),
> so it shouldn't be reporting that it's targeting SSE 4.2. Maybe it's
> using a cached value, and deleting the configure cache would clear
> this up? (CC'-d owner)

I'm not sure if it's related to this, but I got the following build error.

mm_crc32_u64' requires target feature 'crc32', but would be inlined into function 'pg_comp_crc32c_dispatch' that is
compiledwithout support for 'crc32'
 
   70 |                         crc = _mm_crc32_u64(crc, *(const uint64 *) p);
      |                               ^
../../../../src/include/port/pg_crc32c.h:73:10: error: always_inline function '_mm_crc32_u32' requires target feature
'crc32',but would be inlined into function 'pg_comp_crc32c_dispatch' that is compiled without support for 'crc32'
 
   73 |                         crc = _mm_crc32_u32(crc, *(const uint32 *) p);
      |                               ^
../../../../src/include/port/pg_crc32c.h:75:10: error: always_inline function '_mm_crc32_u8' requires target feature
'crc32',but would be inlined into function 'pg_comp_crc32c_dispatch' that is compiled without support for 'crc32'
 
   75 |                         crc = _mm_crc32_u8(crc, *p++);
      |                               ^
3 errors generated.

> Rocky Linux release 9.5 (Blue Onyx)
> gcc (GCC) 11.5.0 20240719 (Red Hat 11.5.0-5)
> clang version 18.1.8 (RESF 18.1.8-3.el9)

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center