Re: [r17-567 Regression] FAIL: gcc.dg/crc-builtin-rev-target64.c scan-rtl-dump expand "; ; (?:using optab for|emitting crc table) crc_8_polynomial_0x12" on Linux/x86_64

ack, I am looking this

Haochen Jiang <[email protected]> 於 2026年5月19日週二 下午4:30寫道：
>
> On Linux/x86_64,
>
> 7034f85fb6577ac48693f0606b7e33fef41a1b74 is the first bad commit
> commit 7034f85fb6577ac48693f0606b7e33fef41a1b74
> Author: Kito Cheng <[email protected]>
> Date:   Fri Nov 28 17:58:21 2025 +0800
>
>     middle-end: Optimize reversed CRC table-based implementation
>
> caused
>
> FAIL: gcc.dg/crc-builtin-rev-target32.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_16_polynomial_0x1021"
> FAIL: gcc.dg/crc-builtin-rev-target32.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_32_polynomial_0x4002123"
> FAIL: gcc.dg/crc-builtin-rev-target32.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_8_polynomial_0x12"
> FAIL: gcc.dg/crc-builtin-rev-target64.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_16_polynomial_0x1021"
> FAIL: gcc.dg/crc-builtin-rev-target64.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_32_polynomial_0x4002123"
> FAIL: gcc.dg/crc-builtin-rev-target64.c scan-rtl-dump expand ";; (?:using optab for|emitting crc table) crc_8_polynomial_0x12"
>
> with GCC configured with
>
> ../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-567/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
>
> To reproduce:
>
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target32.c --target_board='unix{-m32}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target32.c --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target32.c --target_board='unix{-m64}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target32.c --target_board='unix{-m64\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target64.c --target_board='unix{-m64}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/crc-builtin-rev-target64.c --target_board='unix{-m64\ -march=cascadelake}'"
>
> (Please directly reply to this email for question about this report.)
> (If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
> (However, please make sure that there is no potential problems with AVX512.)