[Bug regression/61538] gcc after commit 39a8c5ea produces bad code for MIPS R1x000 CPUs

[kumba at gentoo dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61538

Joshua Kinard <kumba at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|4.8.0                       |4.9.3
      Known to fail|                            |4.9.3
           Severity|major                       |critical

--- Comment #23 from Joshua Kinard <kumba at gentoo dot org> ---
Any chance someone from the MIPS side can take a look at this PR and figure out
a solution?  I cannot find a way to sanely-intercept the glibc build and get
the preprocessed output of 'sln.c'.  glibc's build system is just too complex
to figure out.  I reconfirmed the problem using gcc-4.9.3 20150119
(prerelease), by building it from the gcc-4_9-branch git branch, so this bug is
still present.

Still only seems to affect R10000, R12000, and R14000-based systems.  Can
easily reproduce on both an Octane (IP30) and Onyx2 (IP27).  RM7000-based SGI
O2 (IP32) does not seem to be affected, but I have not had that machine powered
up lately to get a reverification.