[Bug tree-optimization/57660] New: [4.9 regression] FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[Bug tree-optimization/57660] New: [4.9 regression] FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57660

            Bug ID: 57660
           Summary: [4.9 regression] FAIL: gcc.dg/tree-ssa/forwprop-28.c
                    scan-tree-dump-times forwprop1 "Replaced" 8
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: law at gcc dot gnu.org
            Target: m68k-*-*

Created attachment 30325
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30325&action=edit
forwprop-28.c.022t.forwprop1

Executing on host: /daten/aranym/gcc/gcc-20130620/Build/gcc/xgcc
-B/daten/aranym/gcc/gcc-20130620/Build/gcc/
/daten/aranym/gcc/gcc-20130620/gcc/testsuite/gcc.dg/tree-ssa/forwprop-28.c 
-fno-diagnostics-show-caret -fdiagnostics-color=never   -O2
-fdump-tree-forwprop1 -S  -o forwprop-28.s    (timeout = 300)
spawn /daten/aranym/gcc/gcc-20130620/Build/gcc/xgcc
-B/daten/aranym/gcc/gcc-20130620/Build/gcc/
/daten/aranym/gcc/gcc-20130620/gcc/testsuite/gcc.dg/tree-ssa/forwprop-28.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -O2 -fdump-tree-forwprop1
-S -o forwprop-28.s
PASS: gcc.dg/tree-ssa/forwprop-28.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[Bug tree-optimization/57660] FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57660

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at redhat dot com
           Assignee|unassigned at gcc dot gnu.org      |law at redhat dot com
            Summary|[4.9 regression] FAIL:      |FAIL:
                   |gcc.dg/tree-ssa/forwprop-28 |gcc.dg/tree-ssa/forwprop-28
                   |.c scan-tree-dump-times     |.c scan-tree-dump-times
                   |forwprop1 "Replaced" 8      |forwprop1 "Replaced" 8

--- Comment #1 from Jeffrey A. Law <law at redhat dot com> ---
Not a regression as it's a new test.  Odds are other targets with similar
branch cost characteristics are going to see this new failure as well.  Mine.

[Bug tree-optimization/57660] FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57660

--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
We've got two choices here.

First is to somehow make the number of replacements we look for be conditional
on the target.  For targets with an appropriate branch cost (such as m68K)
we'll see 2X the number of replacements as x86_64.

The other approach is to disable the test on those targets, much like we do
with vrp87.c.

I'm investigating the former, if I can find a clean way to do that it'd be the
preferred solution.  Otherwise I'll do the latter.

[Bug tree-optimization/57660] FAIL: gcc.dg/tree-ssa/forwprop-28.c scan-tree-dump-times forwprop1 "Replaced" 8

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57660

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
Test disabled on m68k and other targets with similar branch costs.