[PATCH] Fix PR 52631 (VN does not use simplified expression for lookup)

[Andrew Pinski <andrew dot pinski at caviumnetworks dot com>]

Hi,
  Before tuples was introduced, VN used to lookup the simplified
expression to see if it was available already and use that instead of
the non simplified one.  This patch adds the support back to VN to do
exactly that.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

        * tree-ssa-sccvn.c (visit_use): Look up the simplified
        expression before visting the original one.

        * gcc.dg/tree-ssa/ssa-fre-9.c: Update the number of
        eliminatations that happen.

Attachment: fre_fix.diff.txt
Description: Text document