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Re: [PATCH testsuite]XFAIL gcc.dg/tree-ssa/pr71347 on some targets


On 07/15/2016 08:02 AM, Bin.Cheng wrote:
On Thu, Jul 14, 2016 at 6:14 PM, Jeff Law <law@redhat.com> wrote:
On 07/14/2016 10:11 AM, Bin Cheng wrote:

Hi, Test gcc.dg/tree-ssa/pr71347 failed on some targets if the two
memory references are re-written into different forms by IVOPT.  This
could be because of various reasons, for example, auto-increment
addressing mode.  Since the address expressions are of different
form, DOM fails to eliminate the redundant load at the moment.  I
think DOM should be improved to handle address expressions appearing
in different forms (at least for simple cases).  For now, I will
XFAIL this test indicating a possible enhancement.

FWIW, Adam Lawrence did some work in this area a few months ago. Essentially
enhancing DOM to be able to detect certain MEM_REF and ARRAY_REF accesses
were in fact equivalent.
Hi Jeff,
Do you recall any PR/patch of this?  I didn't find it in mail searching.
The commit references 63679.

Jeff


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