From bcc7e346bf9b5dc77797ea949d6adc740deb30ca Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Sat, 16 Nov 2019 10:40:23 +0000 Subject: Optionally pick the cheapest loop_vec_info This patch adds a mode in which the vectoriser tries each available base vector mode and picks the one with the lowest cost. The new behaviour is selected by autovectorize_vector_modes. The patch keeps the current behaviour of preferring a VF of loop->simdlen over any larger or smaller VF, regardless of costs or target preferences. 2019-11-16 Richard Sandiford gcc/ * target.h (VECT_COMPARE_COSTS): New constant. * target.def (autovectorize_vector_modes): Return a bitmask of flags. * doc/tm.texi: Regenerate. * targhooks.h (default_autovectorize_vector_modes): Update accordingly. * targhooks.c (default_autovectorize_vector_modes): Likewise. * config/aarch64/aarch64.c (aarch64_autovectorize_vector_modes): Likewise. * config/arc/arc.c (arc_autovectorize_vector_modes): Likewise. * config/arm/arm.c (arm_autovectorize_vector_modes): Likewise. * config/i386/i386.c (ix86_autovectorize_vector_modes): Likewise. * config/mips/mips.c (mips_autovectorize_vector_modes): Likewise. * tree-vectorizer.h (_loop_vec_info::vec_outside_cost) (_loop_vec_info::vec_inside_cost): New member variables. * tree-vect-loop.c (_loop_vec_info::_loop_vec_info): Initialize them. (vect_better_loop_vinfo_p, vect_joust_loop_vinfos): New functions. (vect_analyze_loop): When autovectorize_vector_modes returns VECT_COMPARE_COSTS, try vectorizing the loop with each available vector mode and picking the one with the lowest cost. (vect_estimate_min_profitable_iters): Record the computed costs in the loop_vec_info. From-SVN: r278336 --- gcc/tree-vectorizer.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'gcc/tree-vectorizer.h') diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h index fd88084..0eac5bd 100644 --- a/gcc/tree-vectorizer.h +++ b/gcc/tree-vectorizer.h @@ -601,6 +601,13 @@ public: /* Cost of a single scalar iteration. */ int single_scalar_iteration_cost; + /* The cost of the vector prologue and epilogue, including peeled + iterations and set-up code. */ + int vec_outside_cost; + + /* The cost of the vector loop body. */ + int vec_inside_cost; + /* Is the loop vectorizable? */ bool vectorizable; -- cgit v1.1