[Bug tree-optimization/39604] [4.3/4.4/4.5 Regression] tree-ssa-sink breaks stack layout

[matz at gcc dot gnu dot org]

------- Comment #13 from matz at gcc dot gnu dot org  2009-05-10 02:09 -------
Created an attachment (id=17843)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17843&action=view)
type-correct version

This is a type-corrected version of the same C testcase.  Two structs are
different types even if they contain the same members, so the casts and
accesses as 'struct a' where the object really was 'struct b' are not valid.
That can be solved by modeling the same as in C++, via proper subobjects of
base-type.

This testcase still exhibits the abort() with -O2 with 4.3.2 on i386 and
x86_64.  It doesn't fail with current trunk, but most probably for the same
coincidence since a-i merge.  I haven't checked 4.4.x.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39604