[r16-6510 Regression] FAIL: gcc.target/i386/avx10_2-vcvtbf162iubs-2.c (test for excess errors) on Linux/x86_64

[Haochen Jiang]

On Linux/x86_64,

7fcd3ed36c68d39b1d51137d5bdf0bd91b99be60 is the first bad commit
commit 7fcd3ed36c68d39b1d51137d5bdf0bd91b99be60
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Mon Jan 5 20:55:34 2026 +0000

    vect: teach if-convert to predicate __builtin calls [PR122103]

caused

FAIL: gcc.target/i386/avx10_2-vcvtbf162ibs-2.c (internal compiler error: in associated_internal_fn, at builtins.cc:2266)
FAIL: gcc.target/i386/avx10_2-vcvtbf162ibs-2.c (test for excess errors)
FAIL: gcc.target/i386/avx10_2-vcvtbf162iubs-2.c (internal compiler error: in associated_internal_fn, at builtins.cc:2266)
FAIL: gcc.target/i386/avx10_2-vcvtbf162iubs-2.c (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-6510/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="i386.exp=gcc.target/i386/avx10_2-vcvtbf162ibs-2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162ibs-2.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162ibs-2.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162ibs-2.c --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162iubs-2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162iubs-2.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162iubs-2.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/avx10_2-vcvtbf162iubs-2.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.)