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| author | Richard Sandiford <richard.sandiford@arm.com> | 2019-11-16 10:40:23 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2019-11-16 10:40:23 +0000 |
| commit | bcc7e346bf9b5dc77797ea949d6adc740deb30ca (patch) | |
| tree | 5423a73f6ef55339cc766316b3d0e9113cf70129 /gcc/target.def | |
| parent | f884cd2fea62eebe71b422e1c97e550958dd42ae (diff) | |
| download | gcc-bcc7e346bf9b5dc77797ea949d6adc740deb30ca.zip gcc-bcc7e346bf9b5dc77797ea949d6adc740deb30ca.tar.gz gcc-bcc7e346bf9b5dc77797ea949d6adc740deb30ca.tar.bz2 | |
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 <richard.sandiford@arm.com>
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
Diffstat (limited to 'gcc/target.def')
| -rw-r--r-- | gcc/target.def | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/gcc/target.def b/gcc/target.def index d220f8f..e705c5d 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -1925,10 +1925,20 @@ element mode.\n\ If @var{all} is true, add suitable vector modes even when they are generally\n\ not expected to be worthwhile.\n\ \n\ +The hook returns a bitmask of flags that control how the modes in\n\ +@var{modes} are used. The flags are:\n\ +@table @code\n\ +@item VECT_COMPARE_COSTS\n\ +Tells the loop vectorizer to try all the provided modes and pick the one\n\ +with the lowest cost. By default the vectorizer will choose the first\n\ +mode that works.\n\ +@end table\n\ +\n\ The hook does not need to do anything if the vector returned by\n\ @code{TARGET_VECTORIZE_PREFERRED_SIMD_MODE} is the only one relevant\n\ -for autovectorization. The default implementation does nothing.", - void, +for autovectorization. The default implementation adds no modes and\n\ +returns 0.", + unsigned int, (vector_modes *modes, bool all), default_autovectorize_vector_modes) |