[Bug target/116010] New: [15 regression] vectorization regressions on arm and aarch64 since r15-491-gc290e6a0b7a9de

[thiago.bauermann at linaro dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116010

            Bug ID: 116010
           Summary: [15 regression] vectorization regressions on arm and
                    aarch64 since r15-491-gc290e6a0b7a9de
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thiago.bauermann at linaro dot org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64, arm

Since commit r15-491-gc290e6a0b7a9de
(g:c290e6a0b7a9de5692963affc6627a4af7dc2411) we see this regression on
aarch64-linux-gnu:

Running gfortran:gfortran.dg/vect/vect.exp ...
gfortran.dg/vect/vect-8.f90   -O  : pattern found 0 times
FAIL: gfortran.dg/vect/vect-8.f90   -O   scan-tree-dump-times vect "vectorized
2[45] loops" 1

And this regression on armv8l-linux-gnueabihf and arm-eabi:

Running gcc:gcc.target/arm/simd/simd.exp ...
gcc.target/arm/simd/mve-vabs.c: memmove found 0 times
FAIL: gcc.target/arm/simd/mve-vabs.c scan-assembler-times memmove 3

Configure options for aarch64-linux-gnu:

/home/tcwg-buildslave/workspace/tcwg_gnu_4/abe/snapshots/gcc.git~master/configure
\
    SHELL=/bin/bash \
   
--with-mpc=/home/tcwg-buildslave/workspace/tcwg_gnu_4/abe/builds/destdir/aarch64-unknown-linux-gnu
\
   
--with-mpfr=/home/tcwg-buildslave/workspace/tcwg_gnu_4/abe/builds/destdir/aarch64-unknown-linux-gnu
\
   
--with-gmp=/home/tcwg-buildslave/workspace/tcwg_gnu_4/abe/builds/destdir/aarch64-unknown-linux-gnu
\
    --with-gnu-as \
    --with-gnu-ld \
    --disable-libmudflap \
    --enable-lto \
    --enable-shared \
    --without-included-gettext \
    --enable-nls \
    --with-system-zlib \
    --disable-sjlj-exceptions \
    --enable-gnu-unique-object \
    --enable-linker-build-id \
    --disable-libstdcxx-pch \
    --enable-c99 \
    --enable-clocale=gnu \
    --enable-libstdcxx-debug \
    --enable-long-long \
    --with-cloog=no \
    --with-ppl=no \
    --with-isl=no \
    --disable-multilib \
    --enable-fix-cortex-a53-835769 \
    --enable-fix-cortex-a53-843419 \
    --with-arch=armv8-a \
    --enable-threads=posix \
    --enable-multiarch \
    --enable-libstdcxx-time=yes \
    --enable-gnu-indirect-function \
    --enable-checking=yes \
    --disable-bootstrap \
    --enable-languages=default \
   
--prefix=/home/tcwg-buildslave/workspace/tcwg_gnu_4/abe/builds/destdir/aarch64-unknown-linux-gnu

Configure options for armv8l-linux-gnueabihf:

/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/configure
\
    SHELL=/bin/bash \
   
--with-mpc=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/armv8l-unknown-linux-gnueabihf
\
   
--with-mpfr=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/armv8l-unknown-linux-gnueabihf
\
   
--with-gmp=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/armv8l-unknown-linux-gnueabihf
\
    --with-gnu-as \
    --with-gnu-ld \
    --disable-libmudflap \
    --enable-lto \
    --enable-shared \
    --without-included-gettext \
    --enable-nls \
    --with-system-zlib \
    --disable-sjlj-exceptions \
    --enable-gnu-unique-object \
    --enable-linker-build-id \
    --disable-libstdcxx-pch \
    --enable-c99 \
    --enable-clocale=gnu \
    --enable-libstdcxx-debug \
    --enable-long-long \
    --with-cloog=no \
    --with-ppl=no \
    --with-isl=no \
    --disable-multilib \
    --with-float=hard \
    --with-fpu=neon-fp-armv8 \
    --with-mode=thumb \
    --with-arch=armv8-a \
    --enable-threads=posix \
    --enable-multiarch \
    --enable-libstdcxx-time=yes \
    --enable-gnu-indirect-function \
    --enable-checking=yes \
    --disable-bootstrap \
    --enable-languages=default \
   
--prefix=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/armv8l-unknown-linux-gnueabihf

Configure options for arm-eabi:

/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/binutils.git~master/configure
\
    SHELL=/bin/bash \
    --enable-lto \
    --enable-plugins \
    --enable-gold \
    --disable-werror \
    CPPFLAGS=-UFORTIFY_SOURCE \
    --with-pkgversion=Linaro_Binutils-2024.07.19 \
    --disable-gdb \
    --disable-gdbserver \
    --disable-sim \
    --disable-libdecnumber \
    --disable-readline \
   
--with-sysroot=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi
\
    --disable-shared \
    --enable-static \
    --build=x86_64-pc-linux-gnu \
    --host=x86_64-pc-linux-gnu \
    --target=arm-eabi \
   
--prefix=/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/x86_64-pc-linux-gnu