[Bug rtl-optimization/78232] New: [7 Regression] FAIL: gcc.dg/torture/pr48124-4.c

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78232

            Bug ID: 78232
           Summary: [7 Regression] FAIL: gcc.dg/torture/pr48124-4.c
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: segher at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
  Target Milestone: ---
            Target: arm

Hi,

Since r241824:
commit 6df23cf103de2671effb6adaf49348409141b462
Author: segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Nov 3 16:04:22 2016 +0000

    combine lhs zero_extract fix (PR78186)


        PR rtl-optimization/78186
        * combine.c (change_zero_ext): Mask the RHS of a zero_extract as
        well, when converting to IOR.

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@241824
138bc75d-0d04-0410-96

I have noticed execution failures on "old" arm targets:
   gcc.dg/torture/pr48124-4.c   -O1  execution test
  gcc.dg/torture/pr48124-4.c   -O2  execution test
  gcc.dg/torture/pr48124-4.c   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
  gcc.dg/torture/pr48124-4.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
  gcc.dg/torture/pr48124-4.c   -O3 -g  execution test
  gcc.dg/torture/pr48124-4.c   -Os  execution test

For instance on target arm-none-linux-gnueabi --with-cpu=cortex-a9
--with-mode=arm
and running the tests with -march=armv5t

or on arm-none-eabi with default mode/cpu and no special runtest flags
if that's easier.