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> This patch fixes the following bug: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59586. > The segfault is caused by NULL arguments passed to compute_deps by > loop_level_carries_dependences. > This causes an assignment of NULL values to the no_source parameters > of compute_deps. > They are passed to subtract_commutative_associative_deps and dereferenced. > > However, this NULL arguments are appropriate for the algorithm used > in loop_level_carries_dependences. It uses compute_deps > for finding RAW, WAR and WAW dependences of all basic blocks > in the body of the given loop. Subsequently, it tries to > determine presence of these dependences at the given level. > Therefore it maps the relation of the dependences to the relation > of the corresponding time-stamps and intersects the result with > the relation in which all the inputs before the DEPTH occur at the > same time as the output, and the input at the DEPTH occurs before output. > If the intersection is not empty, some dependences are carried > by the DEPTH we currently check and the loop is consequently not parallel. > > This patch tries to avoid the problem by addition to > subtract_commutative_associative_deps > of NULL checking of the no_source statements. > > Tested x86_64-unknown-linux-gnu, applying to 4.8.3 and trunk.
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