[r11-1851 Regression] FAIL: gcc.dg/vect/slp-46.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2 on Linux/x86_64 (-m64 -march=cascadelake)

H.J. Lu hjl.tools@gmail.com
Mon Aug 31 12:35:03 GMT 2020


On Mon, Aug 31, 2020 at 12:25 AM Richard Biener <rguenther@suse.de> wrote:
>
> On Sat, 29 Aug 2020, sunil.k.pandey wrote:
>
> > On Linux/x86_64,
> >
> > dccbf1e2a6e544f71b4a5795f0c79015db019fc3 is the first bad commit
> > commit dccbf1e2a6e544f71b4a5795f0c79015db019fc3
> > Author: Richard Biener <rguenther@suse.de>
> > Date:   Mon Jul 6 16:26:50 2020 +0200
> >
> >     tree-optimization/96075 - fix bogus misalignment calculation
> >
> > caused
> >
> > FAIL: gcc.dg/vect/slp-46.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 2
> > FAIL: gcc.dg/vect/slp-46.c scan-tree-dump-times vect "vectorizing stmts using SLP" 2
>
> It might be useful to point out that the commit in question added the
> testcase that "regressed" plus that you are using a non-standard
> configuration (x86 vectorization unfortunately is too fragmented to
> produce fully attributed or generic testcases that will pass with
> any configuration).
>
> So the appropriate report would be "FAIL: gcc.dg/vect/slp-46.c
> with -march=cascadelake" which isn't a regression.
>

We analyze and report any new failures.  When a testcase fails
with -march=cascadelake, it can be

1. The testcase doesn't expect AVX512.
2. Compiler fails to handle AVX512.

In any case, there are failures which didn't exist before the commit.

-- 
H.J.


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