Hi All, Here is simple patch which cures the issue with outer-loop unswitching - added invocation of number_of_latch_executions() to reject unswitching for non-iterated loops.
Bootstrapping and regression testing did not show any new failures. Is it OK for trunk? ChangeLog: 2014-12-16 Yuri Rumyantsev <ysrum...@gmail.com> PR tree-optimization/68906 * tree-ssa-loop-unswitch.c : Include couple header files. (tree_unswitch_outer_loop): Use number_of_latch_executions to reject non-iterated loops. gcc/testsuite/ChangeLog * gcc.dg/torture/pr68906.c: New test.
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