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[regex] Remove empty_set

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: <libc-alpha at sources dot redhat dot com>
Date: Wed, 03 Nov 2004 12:43:14 +0100
Subject: [regex] Remove empty_set

Several places use a dummy node_set instead of avoiding loops entirely.
This has a mild (1%) effect on performance and makes the code less clear
IMO, hence this patch.  It also prepares for the following patch.

I took the occasion to clean up sift_states_backward, moving the inner loop
out of the function into a new build_sifted_states.

Paolo

Attachment: 03-regex-remove-empty-set.patch
Description: Binary data

Follow-Ups:
- Re: [regex] Remove empty_set
  - From: Ulrich Drepper

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