Re: [r16-7456 Regression] FAIL: gcc.dg/vect/no-section-anchors-vect-64.c -flto -ffat-lto-objects scan-tree-dump-times vect "Vectorizing an unaligned access" 0 on Linux/x86_64

On Thu, 12 Feb 2026, Haochen Jiang wrote:

> On Linux/x86_64,
> 
> 86c00670914f7383c8c1f920d376493459b7aafb is the first bad commit
> commit 86c00670914f7383c8c1f920d376493459b7aafb
> Author: Richard Biener <[email protected]>
> Date:   Wed Feb 11 09:50:55 2026 +0100
> 
>     Use dg-additional-options in vect.exp, simplify file globbing
> 
> caused
> 
> FAIL: gcc.dg/vect/no-section-anchors-vect-31.c -flto -ffat-lto-objects  scan-tree-dump-times vect "Alignment of access forced using peeling" 2
> FAIL: gcc.dg/vect/no-section-anchors-vect-31.c -flto -ffat-lto-objects  scan-tree-dump-times vect "Vectorizing an unaligned access" 0
> FAIL: gcc.dg/vect/no-section-anchors-vect-31.c scan-tree-dump-times vect "Alignment of access forced using peeling" 2
> FAIL: gcc.dg/vect/no-section-anchors-vect-31.c scan-tree-dump-times vect "Vectorizing an unaligned access" 0
> FAIL: gcc.dg/vect/no-section-anchors-vect-64.c -flto -ffat-lto-objects  scan-tree-dump-times vect "Alignment of access forced using peeling" 2
> FAIL: gcc.dg/vect/no-section-anchors-vect-64.c -flto -ffat-lto-objects  scan-tree-dump-times vect "Vectorizing an unaligned access" 0
> FAIL: gcc.dg/vect/no-section-anchors-vect-64.c scan-tree-dump-times vect "Alignment of access forced using peeling" 2
> FAIL: gcc.dg/vect/no-section-anchors-vect-64.c scan-tree-dump-times vect "Vectorizing an unaligned access" 0

This is somewhat mis-attributed since only the -flto FAILs are new which
is because previously those tests were not run with -flto.

Possibly the diff(?) had a -FAIL for the non-flto case as well as the
order of tests run might have significantly changed.

So, nothing to see here.

Richard.

> with GCC configured with
> 
> ../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-7456/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="vect.exp=gcc.dg/vect/no-section-anchors-vect-31.c --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/no-section-anchors-vect-31.c --target_board='unix{-m64\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/no-section-anchors-vect-64.c --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/no-section-anchors-vect-64.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.)
> 

-- 
Richard Biener <[email protected]>
SUSE Software Solutions Germany GmbH,
Frankenstrasse 146, 90461 Nuernberg, Germany;
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)