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

[rguenth at gcc dot gnu dot org]

------- Comment #14 from rguenth at gcc dot gnu dot org  2009-05-10 10:00 -------
Another possible solution that was mentioned is to delay stack slot allocation
until after scheduling (or possibly later code motion optimizations).  Before
that stack slots could be represented by their own pseudos (pointers to the
base of the stack slots) and conflict analysis could be done on RTL based on
life ranges of the memory pointed to by them.  A complication is how to recover
scope based lifetime rules if the stack slots escape to function calls
(but I suggested to do these merging opportunities early on the tree level,
during gimple lowering).


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