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Re: Optimise hash_table::empty

From: Bernd Schmidt <bschmidt at redhat dot com>
To: gcc-patches at gcc dot gnu dot org, nd at arm dot com, richard dot sandiford at arm dot com
Date: Fri, 15 Jan 2016 19:30:40 +0100
Subject: Re: Optimise hash_table::empty
Authentication-results: sourceware.org; auth=none
References: <87a8o6k9jp dot fsf at e105548-lin dot cambridge dot arm dot com>

On 01/15/2016 07:00 PM, Richard Sandiford wrote:

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.  OK to install?


Ok.


Bernd

References:
- Optimise hash_table::empty
  - From: Richard Sandiford

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