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6eac478619
Prepare to handle noncontiguous ifcombine, introducing logic to modify the outer condition when needed. There are two cases worth mentioning: - when blocks are noncontiguous, we have to place the combined condition in the outer block to avoid pessimizing carefully crafted short-circuited tests; - even when blocks are contiguous, we prepare for situations in which the combined condition has two tests, one to be placed in outer and the other in inner. This circumstance will not come up when noncontiguous ifcombine is first enabled, but it will when an improved fold_truth_andor is integrated with ifcombine. Combining the condition from inner into outer may require moving SSA DEFs used in the inner condition, and the changes implement this as well. for gcc/ChangeLog * tree-ssa-ifcombine.cc: Include bitmap.h. (ifcombine_mark_ssa_name): New. (struct ifcombine_mark_ssa_name_t): New. (ifcombine_mark_ssa_name_walk): New. (ifcombine_replace_cond): Prepare to handle noncontiguous and split-condition ifcombine. |
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