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refactor mcclellan runtime

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1. use u32 to hold the state during runtime to prevent repeated zero extension
2. have a tight small loop for processing characters which breaks when
   something interesting happens
This commit is contained in:
Alex Coyte
2016-11-25 15:33:27 +11:00
committed by Matthew Barr
parent ef99ae108f
commit 106667e24e
3 changed files with 288 additions and 198 deletions
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8
src/nfa/mcclellan_internal.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, Intel Corporation
* Copyright (c) 2015-2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -90,8 +90,8 @@ struct mcclellan {
static really_inline
const char *findShermanState(UNUSED const struct mcclellan *m,
const char *sherman_base_offset, u16 sherman_base,
u16 s) {
const char *sherman_base_offset, u32 sherman_base,
u32 s) {
const char *rv
= sherman_base_offset + SHERMAN_FIXED_SIZE * (s - sherman_base);
assert(rv < (const char *)m + m->length - sizeof(struct NFA));
@@ -102,7 +102,7 @@ const char *findShermanState(UNUSED const struct mcclellan *m,
static really_inline
char *findMutableShermanState(char *sherman_base_offset, u16 sherman_base,
u16 s) {
u32 s) {
return sherman_base_offset + SHERMAN_FIXED_SIZE * (s - sherman_base);
}