[r11-4427 Regression] FAIL: gfortran.dg/vect/pr83232.f90 -O scan-tree-dump-times slp1 "vectorizing stmts using SLP" 3 on Linux/x86_64

[r11-4427 Regression] FAIL: gfortran.dg/vect/pr83232.f90 -O scan-tree-dump-times slp1 "vectorizing stmts using SLP" 3 on Linux/x86_64

[sunil.k.pandey]

On Linux/x86_64,

5af1e827bbb624eb28f80d2c5e0da46185af3708 is the first bad commit
commit 5af1e827bbb624eb28f80d2c5e0da46185af3708
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Oct 27 11:03:27 2020 +0100

    Avoid uniform lane BB vectorization

caused

FAIL: gfortran.dg/vect/pr83232.f90   -O   scan-tree-dump-times slp1 "vectorizing stmts using SLP" 3

with GCC configured with

../../gcc/configure --prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-4427/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=gfortran.dg/vect/pr83232.f90 --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gfortran.dg/vect/pr83232.f90 --target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at skpgkp2 at gmail dot com)

Re: [r11-4427 Regression] FAIL: gfortran.dg/vect/pr83232.f90 -O scan-tree-dump-times slp1 "vectorizing stmts using SLP" 3 on Linux/x86_64

[Richard Biener]

On Tue, 27 Oct 2020, sunil.k.pandey wrote:

> On Linux/x86_64,
> 
> 5af1e827bbb624eb28f80d2c5e0da46185af3708 is the first bad commit
> commit 5af1e827bbb624eb28f80d2c5e0da46185af3708
> Author: Richard Biener <rguenther@suse.de>
> Date:   Tue Oct 27 11:03:27 2020 +0100
> 
>     Avoid uniform lane BB vectorization
> 
> caused
> 
> FAIL: gfortran.dg/vect/pr83232.f90   -O   scan-tree-dump-times slp1 "vectorizing stmts using SLP" 3
> 
> with GCC configured with
> 
> ../../gcc/configure --prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-4427/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=gfortran.dg/vect/pr83232.f90 --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gfortran.dg/vect/pr83232.f90 --target_board='unix{-m64\ -march=cascadelake}'"
> 
> (Please do not reply to this email, for question about this report, contact me at skpgkp2 at gmail dot com)

So the testcase is now improved with AVX but the dump scanning doesn't
match the need to split the vectorization at (1) into a AVX and SSE
part.  There's no suitable target selector yet, the vect_sizes_32B_16B
one is an exact match and doesn't fit.  I filed PR97611 for the
testsuite harness issue.