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[bit-set] Use for loop instead of memset for page clear 

Produces faster code.
This commit is contained in:
Behdad Esfahbod 2023-01-16 13:06:30 -07:00
parent 8e8ca03b2a
commit a180ae43ce
1 changed files with 12 additions and 3 deletions
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15
src/hb-bit-page.hh
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@ -42,7 +42,16 @@ struct hb_vector_size_t
elt_t& operator [] (unsigned int i) { return v[i]; } elt_t& operator [] (unsigned int i) { return v[i]; }
const elt_t& operator [] (unsigned int i) const { return v[i]; } const elt_t& operator [] (unsigned int i) const { return v[i]; }
void clear (unsigned char v = 0) { hb_memset (this, v, sizeof (*this)); } void init0 ()
{
for (unsigned int i = 0; i < ARRAY_LENGTH (v); i++)
v[i] = 0;
}
void init1 ()
{
for (unsigned int i = 0; i < ARRAY_LENGTH (v); i++)
v[i] = (elt_t) -1;
}
template <typename Op> template <typename Op>
hb_vector_size_t process (const Op& op) const hb_vector_size_t process (const Op& op) const
@ -80,8 +89,8 @@ struct hb_vector_size_t
struct hb_bit_page_t struct hb_bit_page_t
{ {
void init0 () { v.clear (); } void init0 () { v.init0 (); }
void init1 () { v.clear (0xFF); } void init1 () { v.init1 (); }
constexpr unsigned len () const constexpr unsigned len () const
{ return ARRAY_LENGTH_CONST (v); } { return ARRAY_LENGTH_CONST (v); }