[r16-5316 Regression] FAIL: g++.dg/vect/pr68762-1.cc -std=c++98 (test for excess errors) on Linux/x86_64

Haochen Jiang <[email protected]>
Newsgroups gmane.comp.gcc.patches,gmane.comp.gcc.regression
Message-ID <[email protected]>
On Linux/x86_64,

3d11d69600b7c3ebf0cf8eacc6a4bc8d994710e9 is the first bad commit
commit 3d11d69600b7c3ebf0cf8eacc6a4bc8d994710e9
Author: Richard Biener <[email protected]>
Date:   Fri Nov 14 13:40:50 2025 +0100

    Always analyze possible partial vector usage

caused

FAIL: g++.dg/vect/pr68762-1.cc  -std=c++17 (internal compiler error: in exact_div, at poly-int.h:2179)
FAIL: g++.dg/vect/pr68762-1.cc  -std=c++17 (test for excess errors)
FAIL: g++.dg/vect/pr68762-1.cc  -std=c++26 (internal compiler error: in exact_div, at poly-int.h:2179)
FAIL: g++.dg/vect/pr68762-1.cc  -std=c++26 (test for excess errors)
FAIL: g++.dg/vect/pr68762-1.cc  -std=c++98 (internal compiler error: in exact_div, at poly-int.h:2179)
FAIL: g++.dg/vect/pr68762-1.cc  -std=c++98 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-5316/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=g++.dg/vect/pr68762-1.cc --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=g++.dg/vect/pr68762-1.cc --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.)
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