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Re: [COMMITTED] Fix debug/60438 -- i686 stack vs fp operations


OK if bootstrap succeeds?

With testing of the bootstrap build of the patch, I ran into the following regression compared to a reference bootstrap build without the patch:
...
FAIL: g++.dg/tsan/cond_race.C -O2 output pattern test, is ==3087==WARNING: Program is run with unlimited stack size, which wouldn't work with Threa\
dSanitizer.
==3087==Re-execing with stack size limited to 33554432 bytes.
==================
WARNING: ThreadSanitizer: heap-use-after-free (pid=3087)
  Read of size 8 at 0x7d180000efc8 by thread T1:
#0 pthread_cond_signal /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.i\
nc:2266 (libtsan.so.0+0x000000039b21)
#1 thr(void*) /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/gcc/testsuite/g++.dg/tsan/cond_race.C:20 (cond_race.exe+0x000000001033\
)
  Previous write of size 8 at 0x7d180000efc8 by main thread:
#0 operator delete(void*) /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/libsanitizer/tsan/tsan_interceptors.cc:592 (libtsan.so.0+0\
x0000000494b0)
#1 main /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/gcc/testsuite/g++.dg/tsan/cond_race.C:34 (cond_race.exe+0x000000000ea0)
  Location is heap block of size 96 at 0x7d180000efa0 allocated by main thread:
#0 operator new(unsigned long) /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/libsanitizer/tsan/tsan_interceptors.cc:560 (libtsan.s\
o.0+0x0000000496f2)
#1 main /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/gcc/testsuite/g++.dg/tsan/cond_race.C:25 (cond_race.exe+0x000000000e12)
  Thread T1 (tid=3101, running) created by main thread at:
#0 pthread_create /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/libsanitizer/tsan/tsan_interceptors.cc:877 (libtsan.so.0+0x0000000\
47c23)
#1 main /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/gcc/testsuite/g++.dg/tsan/cond_race.C:29 (cond_race.exe+0x000000000e5a) SUMMARY: ThreadSanitizer: heap-use-after-free /home/vries/gcc_versions/data/test-fix-expand-ldexp/with/src/gcc/testsuite/g++.dg/tsan/cond_race.C:20 t\
hr(void*)
==================
ThreadSanitizer: reported 1 warnings
, should match ThreadSanitizer: data race.*pthread_cond_signal.*
...

I've found the same failure here: http://gcc.gnu.org/ml/gcc-testresults/2014-01/msg00127.html, so I'm assuming it's a spurious failure.

I've committed to trunk and 4.9.

Thanks,
- Tom


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