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The following changes the fallback to disable SLP when any of the discovered SLP instances failed to pass vectorization checking into a fallback that emulates what no SLP would do with SLP - force single-lane discovery for all instances. The patch does not remove the final fallback to disable SLP but it reduces the fallout from failing vectorization when any non-SLP stmt survives analysis. * tree-vectorizer.h (vect_analyze_slp): Add force_single_lane parameter. * tree-vect-slp.cc (vect_analyze_slp_instance): Remove defaulting of force_single_lane. (vect_build_slp_instance): Likewise. Pass down appropriate force_single_lane. (vect_analyze_slp): Add force_sigle_lane parameter and pass it down appropriately. (vect_slp_analyze_bb_1): Always do multi-lane SLP. * tree-vect-loop.cc (vect_analyze_loop_2): Track two SLP modes and adjust accordingly. (vect_analyze_loop_1): Save the SLP mode when unrolling. * gcc.dg/vect/vect-outer-slp-1.c: Adjust. |
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