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style: reduce: introduce and use a swap for bitset

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* src/reduce.c (bitset_swap): New.
Use it.
This commit is contained in:
Akim Demaille
2015-01-13 13:52:15 +01:00
parent c5da1a2adc
commit 8b06c6b871
1 changed files with 9 additions and 10 deletions
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19
src/reduce.c
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@@ -57,6 +57,13 @@ rule_number nuseless_productions;
static int nuseful_nonterminals; static int nuseful_nonterminals;
symbol_number nuseless_nonterminals; symbol_number nuseless_nonterminals;
#define bitset_swap(Lhs, Rhs) \
do { \
bitset lhs__ = Lhs; \
Lhs = Rhs; \
Rhs = lhs__; \
} while (0)
/*-------------------------------------------------------------------. /*-------------------------------------------------------------------.
| Another way to do this would be with a set for each production and | | Another way to do this would be with a set for each production and |
| then do subset tests against N0, but even for the C grammar the | | then do subset tests against N0, but even for the C grammar the |
@@ -119,11 +126,7 @@ useless_nonterminals (void)
} }
if (bitset_equal_p (N, Np)) if (bitset_equal_p (N, Np))
break; break;
{ bitset_swap (N, Np);
bitset Ns = Np;
Np = N;
N = Ns;
}
} }
bitset_free (N); bitset_free (N);
N = Np; N = Np;
@@ -181,11 +184,7 @@ inaccessable_symbols (void)
} }
if (bitset_equal_p (V, Vp)) if (bitset_equal_p (V, Vp))
break; break;
{ bitset_swap (V, Vp);
bitset Vs = Vp;
Vp = V;
V = Vs;
}
} }
} }