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| author | Richard Biener <rguenther@suse.de> | 2022-12-01 16:14:14 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2022-12-02 08:04:11 +0100 |
| commit | 5b50850c3c6f2eceb8012dcc8d3cd5ddd94fac6c (patch) | |
| tree | a4fda0ea5379aad9eb7fea8143025b8175df1cee /gcc/tree-ssa-loop-unswitch.cc | |
| parent | a710f3ce7474792c098ac6fe4dc6a366cdbb4fb4 (diff) | |
| download | gcc-5b50850c3c6f2eceb8012dcc8d3cd5ddd94fac6c.zip gcc-5b50850c3c6f2eceb8012dcc8d3cd5ddd94fac6c.tar.gz gcc-5b50850c3c6f2eceb8012dcc8d3cd5ddd94fac6c.tar.bz2 | |
Add --param max-unswitch-depth
The following adds a --param to limit the depth of unswitched loop
nests. One can use --param max-unswitch-depth=1 to disable unswitching
of outer loops (the innermost loop will then be unswitched).
PR tree-optimization/107946
* params.opt (-param=max-unswitch-depth=): New.
* doc/invoke.texi (--param=max-unswitch-depth): Document.
* tree-ssa-loop-unswitch.cc (init_loop_unswitch_info): Honor
--param=max-unswitch-depth
Diffstat (limited to 'gcc/tree-ssa-loop-unswitch.cc')
| -rw-r--r-- | gcc/tree-ssa-loop-unswitch.cc | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/tree-ssa-loop-unswitch.cc b/gcc/tree-ssa-loop-unswitch.cc index e8c9bd6..df7a201 100644 --- a/gcc/tree-ssa-loop-unswitch.cc +++ b/gcc/tree-ssa-loop-unswitch.cc @@ -263,8 +263,10 @@ init_loop_unswitch_info (class loop *&loop, unswitch_predicate *&hottest, /* Unswitch only nests with no sibling loops. */ class loop *outer_loop = loop; + unsigned max_depth = param_max_unswitch_depth; while (loop_outer (outer_loop)->num != 0 - && !loop_outer (outer_loop)->inner->next) + && !loop_outer (outer_loop)->inner->next + && --max_depth != 0) outer_loop = loop_outer (outer_loop); hottest = NULL; hottest_bb = NULL; |