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However, following the ARM approach, we probably want to disallow side effects only for IF_THEN_ELSE forms and leave "predicable" attributes on everything, since they produce COND_EXEC forms of conditional assignment. I think the following part of Steve's original patch should be sufficient (bootstrapping it now):
JFYI, bootstrap and regtest succeeded on ia64-linux, testcase in the PR and vect-cond-*.c tests do not fail with this patch.
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