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[buddy] Inline the "is bdd constant" check performed in copies/constructors.

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This avoids a library call to bdd_addref or bdd_delref.

* src/kernel.c (bdd_delref_nc, bdd_addref_nc): New function,
that work only on BDD that are not constant.
* src/cpext.cxx (bdd::operator=): Move...
* src/bdd.hh (bdd::operator=): ... here.
(bdd::bdd, bdd::~bdd, bdd::operator=): Inline the "is bdd constant"
check and call bdd_delref_nc/bdd_addref_nc only otherwise.
This commit is contained in:
Alexandre Duret-Lutz 2011-04-30 13:37:53 +02:00
parent 2b58fb90c4
commit 1d1872ab90
4 changed files with 104 additions and 59 deletions
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34
buddy/src/bdd.h
View file

@ -272,7 +272,9 @@ extern int bdd_var(BDD) __purefn;
extern BDD bdd_low(BDD) __purefn;
extern BDD bdd_high(BDD) __purefn;
extern int bdd_varlevel(int) __purefn;
extern BDD bdd_addref_nc(BDD);
extern BDD bdd_addref(BDD);
extern BDD bdd_delref_nc(BDD);
extern BDD bdd_delref(BDD);
extern void bdd_gbc(void);
extern int bdd_scanset(BDD, int**, int*);
@ -453,8 +455,8 @@ class bdd
public:
bdd(void) { root=0; }
bdd(const bdd &r) { bdd_addref(root=r.root); }
~bdd(void) { bdd_delref(root); }
bdd(const bdd &r) { root=r.root; if (root > 1) bdd_addref_nc(root); }
~bdd(void) { if (root > 1) bdd_delref_nc(root); }
int id(void) const;
@ -481,7 +483,7 @@ class bdd
private:
BDD root;
bdd(BDD r) { bdd_addref(root=r); }
bdd(BDD r) { root=r; if (root > 1) bdd_addref_nc(root); }
bdd operator=(BDD r);
friend int bdd_init(int, int);
@ -849,6 +851,32 @@ inline int bdd::operator==(const bdd &r) const
inline int bdd::operator!=(const bdd &r) const
{ return r.root!=root; }
inline bdd bdd::operator=(const bdd &r)
{
if (__likely(root != r.root))
{
if (root > 1)
bdd_delref_nc(root);
root = r.root;
if (root > 1)
bdd_addref_nc(root);
}
return *this;
}
inline bdd bdd::operator=(int r)
{
if (__likely(root != r))
{
if (root > 1)
bdd_delref_nc(root);
root = r;
if (root > 1)
bdd_addref_nc(root);
}
return *this;
}
inline bdd bdd_true(void)
{ return 1; }