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[buddy] * src/bddop.c (apply_rec, appquant_rec): Improve caching by

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reordering operands of commutative operators.
This commit is contained in:
Alexandre Duret-Lutz 2011-06-10 18:39:28 +02:00
parent c42d55e6b1
commit fb3edb47e0
2 changed files with 121 additions and 16 deletions
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5
buddy/ChangeLog
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@ -1,3 +1,8 @@
2011-06-10 Alexandre Duret-Lutz <adl@lrde.epita.fr>
* src/bddop.c (apply_rec, appquant_rec): Improve caching by
reordering operands of commutative operators.
2011-06-09 Alexandre Duret-Lutz <adl@lrde.epita.fr>
Remove some valgrind warnings about uninitialized memory when

132
buddy/src/bddop.c
View file

@ -570,36 +570,76 @@ static BDD apply_rec(BDD l, BDD r)
case bddop_and:
if (l == r)
return l;
if (ISZERO(l) || ISZERO(r))
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (ISZERO(l) /* || ISZERO(r) */)
return 0;
if (ISONE(l))
return r;
if (ISONE(r))
return l;
/* if (ISONE(r))
return l; */
break;
case bddop_or:
if (l == r)
return l;
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (ISONE(l) || ISONE(r))
return 1;
if (ISZERO(l))
return r;
if (ISZERO(r))
return l;
/* if (ISZERO(r))
return l; */
break;
case bddop_xor:
if (l == r)
return 0;
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (ISZERO(l))
return r;
if (ISZERO(r))
return l;
/* if (ISZERO(r))
return l; */
break;
case bddop_nand:
if (ISZERO(l) || ISZERO(r))
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (ISZERO(l) /* || ISZERO(r) */)
return 1;
break;
case bddop_nor:
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (ISONE(l) || ISONE(r))
return 0;
break;
@ -611,6 +651,16 @@ static BDD apply_rec(BDD l, BDD r)
if (ISONE(r))
return 1;
break;
case bddop_biimp:
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
break;
}
if (ISCONST(l) && ISCONST(r))
@ -2083,40 +2133,90 @@ static int appquant_rec(int l, int r)
switch (appexop)
{
case bddop_and:
if (l == 0 || r == 0)
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (l == 0 /* || r == 0 */)
return 0;
if (l == r)
return quant_rec(l);
if (l == 1)
return quant_rec(r);
if (r == 1)
return quant_rec(l);
/* if (r == 1)
return quant_rec(l); */
break;
case bddop_or:
if (l == 1 || r == 1)
return 1;
if (l == r)
return quant_rec(l);
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (l == 0)
return quant_rec(r);
if (r == 0)
return quant_rec(l);
/* if (r == 0)
return quant_rec(l); */
break;
case bddop_xor:
if (l == r)
return 0;
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (l == 0)
return quant_rec(r);
if (r == 0)
return quant_rec(l);
/* if (r == 0)
return quant_rec(l); */
break;
case bddop_nand:
if (l == 0 || r == 0)
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
if (l == 0 /* || r == 0 */)
return 1;
break;
case bddop_nor:
if (l == 1 || r == 1)
return 0;
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
break;
case bddop_biimp:
/* The operation is commutative, so lets
order the arguments to favor cache hits. */
if (l > r)
{
BDD tmp = l;
l = r;
r = tmp;
}
break;
}