[Bug target/59021] [4.9 regression] new vzeroupper instructions generated with -mavx

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59021

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2013-11-06
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail dot com
     Ever confirmed|0                           |1

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
I have patch in testing.

--cut here--
Index: config/i386/i386.c
===================================================================
--- config/i386/i386.c  (revision 204459)
+++ config/i386/i386.c  (working copy)
@@ -15708,7 +15708,7 @@ ix86_avx_u128_mode_needed (rtx insn)
              rtx arg = XEXP (XEXP (link, 0), 0);

              if (ix86_check_avx256_register (&arg, NULL))
-               return AVX_U128_ANY;
+               return AVX_U128_DIRTY;
            }
        }

--cut here--
>From gcc-bugs-return-433744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Nov 06 17:43:40 2013
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Subject: [Bug sanitizer/59018] [4.9 Regression] libsanitizer doesn't build for x32
Date: Wed, 06 Nov 2013 17:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY018

--- Comment #1 from Kostya Serebryany <kcc at gcc dot gnu.org> ---
At least one of these patches does not build with clang:

/home/kcc/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc:807:21:
error: ignored asm label 'r8' on automatic variable [-Werror]
  void *r8 __asm__ ("r8") = newtls;
                    ^
/home/kcc/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc:808:21:
error: ignored asm label 'r10' on automatic variable [-Werror]
  int *r10 __asm__ ("r10") = child_tidptr;
                    ^

is this some kind of gcc-specific syntax?
(forgive my ignorance here)

Two general questions:

1. Before doing the merge I test the patch like this:
rm -rf */{*/,}libsanitizer && make -j 50  && make -C gcc check-g{cc,++}
RUNTESTFLAGS='--target_board=unix\{-m32,-m64\} asan.exp'

What should I add to this line to also test x32?

2. Is there any chance to test x32 off the clang tree, so that we keep the
upstream tree x32-clean all the time?