On Thu, 6 Apr 2017, Rainer Orth wrote:
> Hi Richard,
>
> > The following patch makes sure to preserve (mis-)alignment of memory
> > references when IVOPTs generates TARGET_MEM_REFs for them.
> >
> > Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
> >
> > Richard.
> >
> > 2017-04-06 Richard Biener <rguent...@suse.de>
> >
> > PR tree-optimization/80334
> > * tree-ssa-loop-ivopts.c (rewrite_use_address): Properly
> > preserve alignment of accesses.
> >
> > * g++.dg/torture/pr80334.C: New testcase.
>
> the new testcase FAILs on 32-bit Solaris/SPARC:
>
> +FAIL: g++.dg/torture/pr80334.C -O0 (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -O1 (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -O2 (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -O2 -flto (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -O2 -flto -flto-partition=none (test for
> exce
> ss errors)
> +FAIL: g++.dg/torture/pr80334.C -O3 -fomit-frame-pointer -funroll-loops
> -fpeel
> -loops -ftracer -finline-functions (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -O3 -g (test for excess errors)
> +FAIL: g++.dg/torture/pr80334.C -Os (test for excess errors)
>
> Excess errors:
> /vol/gcc/src/hg/trunk/local/gcc/testsuite/g++.dg/torture/pr80334.C:11:20:
> warning: requested alignment 16 is larger than 8 [-Wattributes]
Any suggestion how to mitigate that? Possible solution includes
adding { target { ! ... } } to dg-do run.
Richard.
