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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 | |
| 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
| -rw-r--r-- | gcc/doc/invoke.texi | 3 | ||||
| -rw-r--r-- | gcc/params.opt | 4 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-unswitch.cc | 4 |
3 files changed, 10 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 56e5e87..277ac35 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -14963,6 +14963,9 @@ The maximum depth of a loop nest suitable for complete peeling. @item max-unswitch-insns The maximum number of insns of an unswitched loop. +@item max-unswitch-depth +The maximum depth of a loop nest to be unswitched. + @item lim-expensive The minimum cost of an expensive expression in the loop invariant motion. diff --git a/gcc/params.opt b/gcc/params.opt index c1dcb7e..397ec0b 100644 --- a/gcc/params.opt +++ b/gcc/params.opt @@ -726,6 +726,10 @@ The maximum number of instructions to consider to unroll in a loop. Common Joined UInteger Var(param_max_unswitch_insns) Init(50) Param Optimization The maximum number of insns of an unswitched loop. +-param=max-unswitch-depth= +Common Joined UInteger Var(param_max_unswitch_depth) Init(50) IntegerRange(1, 50) Param Optimization +The maximum depth of a loop nest to be unswitched. + -param=max-variable-expansions-in-unroller= Common Joined UInteger Var(param_max_variable_expansions) Init(1) Param Optimization If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling. 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; |