[Bug target/28629] [4.1] Segfault with --march=pentium-m -O2 when compiling faac

[fxcoudert at gcc dot gnu dot org]

--- Comment #7 from fxcoudert at gcc dot gnu dot org  2007-08-24 12:53 
---
Also works on mainline (4.3).


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fxcoudert at gcc dot gnu dot org changed:

   What|Removed |Added

  Known to work||4.2.0 4.3.0
Summary|Segfault with --|[4.1] Segfault with --
   |march=pentium-m -O2 when|march=pentium-m -O2 when
   |compiling faac  |compiling faac


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28629

[Bug target/28629] [4.1] Segfault with --march=pentium-m -O2 when compiling faac

[zuxy dot meng at gmail dot com]

--- Comment #8 from zuxy dot meng at gmail dot com  2007-08-25 08:21 ---
Is it possible that the reason may be that I compiled gcc with additional
CFLAGS? I added -march=pentium-m -ftree-vectorize -mfpmath=sse,387 and
-fomit-frame-pointer in addition to -O2.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28629

[Bug target/28629] [4.1] Segfault with --march=pentium-m -O2 when compiling faac

[zuxy dot meng at gmail dot com]

--- Comment #9 from zuxy dot meng at gmail dot com  2007-08-25 17:14 ---
I've confirmed that the problem is caused by '-ftree-vectorize' passed to
compile gcc. More precisely, a 'movdqa' instruction in constraint_operands()
accessed an unaligned memory.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28629

[Bug target/28629] [4.1] Segfault with --march=pentium-m -O2 when compiling faac

[dorit at gcc dot gnu dot org]

--- Comment #10 from dorit at gcc dot gnu dot org  2007-08-26 07:49 ---
(In reply to comment #9)
> I've confirmed that the problem is caused by '-ftree-vectorize' passed to
> compile gcc. More precisely, a 'movdqa' instruction in constraint_operands()
> accessed an unaligned memory.

since this is reported to work on 4.2 and 4.3, I wonder if it's related to the
fix for PR25413 (which was committed to 4.2 and 4.3).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28629