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From: "kumba at gentoo dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/61538] g++ compiled binary, linked to glibc libpthread, hangs on SGI MIPS R1x000 systems on Linux
Date: Mon, 21 Jul 2014 07:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61538

--- Comment #17 from Joshua Kinard <kumba at gentoo dot org> ---
(In reply to Joshua Kinard from comment #16)
> In 'all-stage2-gcc'.  That's right around the commit you're referencing, so
> I went ahead and reversed these four commits:
> 
> 1. 39a8c5eaded1e5771a941c56a49ca0a5e9c5eca0  * config/mips/mips.c
> (mips_emit_pre_atomic_barrier_p,)
> 2. 974f0a74e2116143b88d8cea8e1dd5a9c18ef96c  * config/mips/constraints.md
> (ZR): New constraint.
> 3. 0f8e46b16a53c02d7255dcd6b6e9b5bc7f8ec953  * config/mips/mips.c
> (mips_process_sync_loop): Emit cmp result only if
> 4. 30c3c4427521f96fb58b6e1debb86da4f113f06f  * emit-rtl.c
> (need_atomic_barrier_p): New function.

Already mentioned to Andrew on IRC, but reversing these four commits solves the
problem, but I am still not sure why it affects R1x000 CPUs.  I can upload the
static binaries of 'sln' for someone to look at if they'd like.