[Bug testsuite/67203] New: [6 regression] FAIL: g++.dg/tree-ssa/pr61034.C -std=gnu++11 scan-tree-dump-times fre2 "free" 10

[Bug testsuite/67203] New: [6 regression] FAIL: g++.dg/tree-ssa/pr61034.C -std=gnu++11 scan-tree-dump-times fre2 "free" 10

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67203

            Bug ID: 67203
           Summary: [6 regression] FAIL: g++.dg/tree-ssa/pr61034.C
                    -std=gnu++11  scan-tree-dump-times fre2 "free" 10
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
            Target: ia64-*-*, aarch64-*-*

Broken by r226852.

$ gcc/xg++ -Bgcc/ ../gcc/testsuite/g++.dg/tree-ssa/pr61034.C -nostdinc++
-Iia64-suse-linux/libstdc++-v3/include/ia64-suse-linux
-Iia64-suse-linux/libstdc++-v3/include -I../libstdc++-v3/libsupc++
-I../libstdc++-v3/include/backward -I../libstdc++-v3/testsuite/util
-std=gnu++11 -O3 -fdump-tree-fre2 -S -o pr61034.s
$ grep -c free *.fre2
14

[Bug testsuite/67203] [6 regression] FAIL: g++.dg/tree-ssa/pr61034.C -std=gnu++11 scan-tree-dump-times fre2 "free" 10

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67203

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-08-13
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Target Milestone|---                         |6.0
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.

[Bug testsuite/67203] [6 regression] FAIL: g++.dg/tree-ssa/pr61034.C -std=gnu++11 scan-tree-dump-times fre2 "free" 10

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67203

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Bah, so this boils down to PUSH_ARGS_REVERSED and its affect on gimplification
and thus initial GIMPLE.  In this case PUSH_ARGS_REVERSED == 1 "wins".
(for the operator- calls code for b * c and c * d is emitted first)

So we could add an effective target push_args_reversed ... iff that's easy
enough to fill-in.  Or explicitely add target matches.  Or spend more
time on trying to analyze why order matters for SCCVN here (it's all about
->count CSE).