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| author | Andrew MacLeod <amacleod@redhat.com> | 2021-09-29 17:25:50 -0400 |
|---|---|---|
| committer | Andrew MacLeod <amacleod@redhat.com> | 2021-10-06 09:18:09 -0400 |
| commit | 3ca950c3525527846f13e8c547368ef432547a23 (patch) | |
| tree | 84156fb071b8bf136365d9ddfce681ef78a181b3 /gcc/doc | |
| parent | e828f4b5898896240b2ae5d5030c539aff28ea24 (diff) | |
| download | gcc-3ca950c3525527846f13e8c547368ef432547a23.zip gcc-3ca950c3525527846f13e8c547368ef432547a23.tar.gz gcc-3ca950c3525527846f13e8c547368ef432547a23.tar.bz2 | |
Introduce a param-switch-limit for EVRP.
Very large switches cause a lot of range calculations with multiple subranges
to happen. This can cause quadratic or even exponetial time increases in
large testcases. This patch introduces a param variable to limit
the size of switches EVRP will process.
* gimple-range-edge.cc (gimple_outgoing_range::gimple_outgoing_range):
Add parameter to limit size when recognizing switches.
(gimple_outgoing_range::edge_range_p): Check size limit.
* gimple-range-edge.h (gimple_outgoing_range): Add size field.
* gimple-range-gori.cc (gori_map::calculate_gori): Ignore switches
that exceed the size limit.
(gori_compute::gori_compute): Add initializer.
* params.opt (evrp-switch-limit): New.
* doc/invoke.texi: Update docs.
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b4eaa77..80bc7fe 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -14505,6 +14505,9 @@ Maximum number of basic blocks before EVRP uses a sparse cache. @item evrp-mode Specifies the mode Early VRP should operate in. +@item evrp-switch-limit +Specifies the maximum number of switch cases before EVRP ignores a switch. + @item unroll-jam-min-percent The minimum percentage of memory references that must be optimized away for the unroll-and-jam transformation to be considered profitable. |