[Bug fortran/40037] gfortran -O3 optimization generates code that seg faults on unaligned array data

[hjl dot tools at gmail dot com]

------- Comment #4 from hjl dot tools at gmail dot com  2009-05-06 17:39 -------
(In reply to comment #3)
> The code generated for SMALL is correct, any caller that passes argument not
> aligned on 8 byte boundary (you are mistaken that it requires 16 byte
> alignment,
> try calling it with c(3) which is 8 byte aligned, but not 16 byte aligned and
> it will work too) is invalid.  All DOUBLE PRECISION variables/arrays must be
> properly aligned on 8 byte boundaries.
> 

I believe x86-64 psABI requires that all arrays >= 16byte must be aligned
at 16byte.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40037