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r232467 - in /trunk/gcc: ChangeLog hash-table.h
- From: rsandifo at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Sat, 16 Jan 2016 11:03:18 -0000
- Subject: r232467 - in /trunk/gcc: ChangeLog hash-table.h
Author: rsandifo
Date: Sat Jan 16 11:03:18 2016
New Revision: 232467
URL: https://gcc.gnu.org/viewcvs?rev=232467&root=gcc&view=rev
Log:
Optimise hash_table::empty
Calling redirect_edge_var_map_empty after each pass was slowing things
down because hash_table::empty () cleared all slots even if the hash
table was already empty.
Tested on x86_64-linux-gnu, where it gives a 1% compile time improvement
for fold-const.ii at -O and -O2.
gcc/
* hash-table.h (hash_table::empty): Turn into an inline wrapper
that checks whether the table is already empty. Rename the
original implementation to...
(hash_table::empty_slot): ...this new private function.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/hash-table.h