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Add log base 2 versions of constants.

This commit is contained in:
Andy John 2022-03-21 13:12:14 -07:00 committed by Behdad Esfahbod
parent 1ffe637a0e
commit 3125f5ae33
1 changed files with 5 additions and 0 deletions
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5
src/hb-bit-page.hh
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@ -179,6 +179,8 @@ struct hb_bit_page_t
typedef unsigned long long elt_t;
static constexpr unsigned PAGE_BITS = 512;
static_assert ((PAGE_BITS & ((PAGE_BITS) - 1)) == 0, "");
static constexpr unsigned PAGE_BITS_LOG_2 = 9;
static_assert (1 << PAGE_BITS_LOG_2 == PAGE_BITS, "");
static unsigned int elt_get_min (const elt_t &elt) { return hb_ctz (elt); }
static unsigned int elt_get_max (const elt_t &elt) { return hb_bit_storage (elt) - 1; }
@ -186,6 +188,9 @@ struct hb_bit_page_t
typedef hb_vector_size_t<elt_t, PAGE_BITS / 8> vector_t;
static constexpr unsigned ELT_BITS = sizeof (elt_t) * 8;
static constexpr unsigned ELT_BITS_LOG_2 = 6;
static_assert (1 << ELT_BITS_LOG_2 == ELT_BITS, "");
static constexpr unsigned ELT_MASK = ELT_BITS - 1;
static constexpr unsigned BITS = sizeof (vector_t) * 8;
static constexpr unsigned MASK = BITS - 1;