https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65551

            Bug ID: 65551
           Summary: [5 Regression]  FAIL: 26_numerics/complex/50880.cc
                    execution test
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: thopre01 at gcc dot gnu.org
          Reporter: jgreenhalgh at gcc dot gnu.org
              Host: arm-none-linux-gnueabihf
            Target: arm-none-linux-gnueabihf

As of r220390 we've started to FAIL this test from libstdc++ on
arm-none-linux-gnueabihf:

FAIL: 26_numerics/complex/50880.cc execution test
./50880.exe
50880.exe:
/work/jamgre01/gcc-src/libstdc++-v3/testsuite/26_numerics/complex/50880.cc:36:
void test01_do() [with T = double]: Assertion `cra.real() > T(0)' failed.
Aborted

Bisect pinpointed the failure to this commit:

Author: thopre01 <thopre01@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Feb 4 08:22:45 2015 +0000

    2015-02-04  Thomas Preud'homme  <thomas.preudho...@arm.com>

        gcc/
        PR middle-end/62103
        * tree-ssa-sccvn.c (fully_constant_vn_reference_p): Use TYPE_PRECISION
        to compute size of referenced value in the constant case.

        gcc/testsuite/
        PR middle-end/62103
        * gcc.c-torture/execute/bitfld-7.c: New test adapted from bitfld-6.c
        to use 24 bits for bitfield b.

Compiler configured with: /work/jamgre01//gcc-src/configure
--with-cpu=cortex-a9 --with-fpu=neon-fp16 --with-mode=thumb --with-float=hard
--enable-languages=c,c++,fortran --prefix=/work/jamgre01//gcc-install
--with-build-config=bootstrap-time

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