------- Comment #2 from vmakarov at redhat dot com 2008-11-14 03:13 -------
Removing redundant stores could be done by solving a dataflow
problem. Unfortunately such global solution would complicate IR
flattening.
I am going to submit a patch soon which solves the problem by
prohibiting removing stores if there is path from a destination loop
(pseudo assigned to memory there) to the header of source loop (pseudo
assign to hard register there) containing basic blocks of non-parents
(grandparents) of the source loop. That is the assumption on which
ira-build.c:ir_flattening code works.
--
vmakarov at redhat dot com changed:
What |Removed |Added
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CC| |vmakarov at redhat dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37859
