[Bug rtl-optimization/70681] New: [6 Regression] FAIL: gcc.dg/ira-shrinkwrap-prep-2.c gcc.dg/pr10474.c on arm and powerpc

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70681

            Bug ID: 70681
           Summary: [6 Regression] FAIL: gcc.dg/ira-shrinkwrap-prep-2.c
                    gcc.dg/pr10474.c on arm and powerpc
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---
            Target: arm, powerpc

As reported at:
https://gcc.gnu.org/ml/gcc-patches/2016-03/msg01640.html
and
https://gcc.gnu.org/ml/gcc-patches/2016-04/msg00094.html

The tests:
  gcc.dg/ira-shrinkwrap-prep-2.c scan-rtl-dump pro_and_epilogue
"Performing shrink-wrapping"
  gcc.dg/pr10474.c scan-rtl-dump pro_and_epilogue "Performing shrink-wrapping"

Have started failing on arm and powerpc after a regalloc change.
On arm at least the resulting codegen doesn't look worse
(https://gcc.gnu.org/ml/gcc-patches/2016-04/msg00223.html)

but arguably shrink-wrapping could be improved
(https://gcc.gnu.org/ml/gcc-patches/2016-04/msg00265.html)

This is a report to track work on shrinkwrapping or adjustment of the
testscases