[Bug tree-optimization/59249] if-conversion doesn't handle basic-blocks with only critical predecessor edges
bmei at broadcom dot com
gcc-bugzilla@gcc.gnu.org
Tue Nov 26 11:48:00 GMT 2013
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59249
--- Comment #4 from Bingfeng Mei <bmei at broadcom dot com> ---
Even I split one critical predecessor edge, predicate of BB6 is still ORed
result of two conditions from BB4 & BB5. ORing two conditions results in a
sequence of statements that cannot be vectorized. Vectorizer complains of
"bit-precision arithmetic not supported" because of boolean operations.
Not sure how to transform the code except reverting back to a form similar to
pre jump-threading.
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