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Re: [PATCH] Fold VEC_[LR]SHIFT_EXPR (PR tree-optimization/57051)
- From: Mikael Pettersson <mikpe at it dot uu dot se>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: Richard Biener <rguenther at suse dot de>, gcc-patches at gcc dot gnu dot org
- Date: Thu, 16 May 2013 19:59:00 +0200
- Subject: Re: [PATCH] Fold VEC_[LR]SHIFT_EXPR (PR tree-optimization/57051)
- References: <20130425214702 dot GJ28963 at tucnak dot redhat dot com> <20130503131829 dot GC28963 at tucnak dot redhat dot com>
Jakub Jelinek writes:
> On Thu, Apr 25, 2013 at 11:47:02PM +0200, Jakub Jelinek wrote:
> > This patch adds folding of constant arguments v>> and v<<, which helps to
> > optimize the testcase from the PR back into constant store after vectorized
> > loop is unrolled.
>
> As this fixes a regression on the 4.8 branch, I've backported it (and
> minimal prerequisite for that) to 4.8 branch too.
Unfortunately this patch makes gcc.dg/vect/no-scevccp-outer-{7,13}.c fail
on powerpc64-linux:
+FAIL: gcc.dg/vect/no-scevccp-outer-13.c execution test
+FAIL: gcc.dg/vect/no-scevccp-outer-7.c execution test
which is a regression from 4.8-20130502. Reverting r198580 fixes it.
The same FAILs also occur on trunk.
/Mikael