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| author | Richard Biener <rguenther@suse.de> | 2020-11-18 14:17:34 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-06-09 14:41:42 +0200 |
| commit | ce670e4faafb296d1f1a7828d20f8c8ba4686797 (patch) | |
| tree | 32e1806d019c44ba59b0fef020ccd2c661ce69d0 /gcc/tree-vectorizer.h | |
| parent | 13a39886940331149173b25d6ebde0850668d8b9 (diff) | |
| download | gcc-ce670e4faafb296d1f1a7828d20f8c8ba4686797.zip gcc-ce670e4faafb296d1f1a7828d20f8c8ba4686797.tar.gz gcc-ce670e4faafb296d1f1a7828d20f8c8ba4686797.tar.bz2 | |
tree-optimization/97832 - handle associatable chains in SLP discovery
This makes SLP discovery handle associatable (including mixed
plus/minus) chains better by swapping operands across the whole
chain. To work this adds caching of the 'matches' lanes for
failed SLP discovery attempts, thereby fixing a failed SLP
discovery for the slp-pr98855.cc testcase which results in
building an operand from scalars as expected. Unfortunately
this makes us trip over the cost threshold so I'm XFAILing the
testcase for now.
For BB vectorization all this doesn't work because we have no way
to distinguish good from bad associations as we eventually build
operands from scalars and thus not fail in the classical sense.
2021-05-31 Richard Biener <rguenther@suse.de>
PR tree-optimization/97832
* tree-vectorizer.h (_slp_tree::failed): New.
* tree-vect-slp.c (_slp_tree::_slp_tree): Initialize
failed member.
(_slp_tree::~_slp_tree): Free failed.
(vect_build_slp_tree): Retain failed nodes and record
matches in them, copying that back out when running
into a cached fail. Dump start and end of discovery.
(dt_sort_cmp): New.
(vect_build_slp_tree_2): Handle associatable chains
together doing more aggressive operand swapping.
* gcc.dg/vect/pr97832-1.c: New testcase.
* gcc.dg/vect/pr97832-2.c: Likewise.
* gcc.dg/vect/pr97832-3.c: Likewise.
* g++.dg/vect/slp-pr98855.cc: XFAIL.
Diffstat (limited to 'gcc/tree-vectorizer.h')
| -rw-r--r-- | gcc/tree-vectorizer.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h index 06d20c7..1fb46c6 100644 --- a/gcc/tree-vectorizer.h +++ b/gcc/tree-vectorizer.h @@ -167,6 +167,11 @@ struct _slp_tree { int vertex; + /* If not NULL this is a cached failed SLP discovery attempt with + the lanes that failed during SLP discovery as 'false'. This is + a copy of the matches array. */ + bool *failed; + /* Allocate from slp_tree_pool. */ static void *operator new (size_t); |