[Bug target/32893] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize

[dorit at gcc dot gnu dot org]

------- Comment #7 from dorit at gcc dot gnu dot org  2007-09-19 14:28 -------
(In reply to comment #6)
> It looks like 
> zlib compiled w/ -O -msse -ftree-vectorize (built with fedora's rpm package
> gcc-4.1.2-17) 
> has same problem.
> In my environment, rpm-4.4.2.1-7.fc8 and seamonkey-1.1.3-6.fc8 segfault like
> below:
> Program received signal SIGSEGV, Segmentation fault.
> 0x003a869d in inflate_table (type=CODES, lens=0x913b5c8, codes=19,
>     table=0x913b5c4, bits=0x913b5ac, work=0x913b848) at inftrees.c:108
> 108             count[len] = 0;

could you please provide a complete (reduced...) testcase that could be used to
reproduce this? 
In the meantime, other things that may help:
- could you please try to add "__attribute__ ((__aligned__(16)))" to the
definition of count, as suggested in comment 5?
- could you please show the relevant generated assembly up to the offending
insn?  (with and without the attribute aligned)? could you also check (with
gdb) what is the address accessed and what is the address of the stack pointer?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32893