[Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize

[hjl dot tools at gmail dot com]

------- Comment #10 from hjl dot tools at gmail dot com  2009-09-19 21:42 -------
(In reply to comment #9)
> Created an attachment (id=18608)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18608&action=view) [edit]
> sse & 32bit -> -mstackrealign (example only!)
> 
> Previous my ideas too heavy. :)
> IMHO native solution for this problem is "-mstackrealign". It solving problems
> with known to me packages (including zlib). I trying to make
> STACK_REALIGN_DEFAULT related from TARGET_SSE && !TARGET_64BIT (see patch). But
> got "internal compiler error" on gcc self-compiling with "-march=pentium4".
> Without sse (=without -mstackrealign) self-compiling works.
> 
> Why -mstackrealign may be bad and why gcc dont' self-compiling so?
> 

Stack alignment in unwind library is unsupported.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41156