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[BEInt] Use packed-int trick for writing as well

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This commit is contained in:
Behdad Esfahbod 2023-06-01 19:24:02 -06:00
parent 4d853b8ba6
commit 88d8a6d69f
1 changed files with 45 additions and 22 deletions
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67
src/hb-algs.hh
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@ -87,6 +87,19 @@ static inline constexpr uint16_t hb_uint16_swap (uint16_t v)
static inline constexpr uint32_t hb_uint32_swap (uint32_t v)
{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
#ifndef HB_FAST_INT_ACCESS
#if defined(__OPTIMIZE__) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __BIG_ENDIAN || \
(__BYTE_ORDER == __LITTLE_ENDIAN && \
hb_has_builtin(__builtin_bswap16) && \
hb_has_builtin(__builtin_bswap32)))
#define HB_FAST_INT_ACCESS 1
#else
#define HB_FAST_INT_ACCESS 0
#endif
#endif
template <typename Type, int Bytes = sizeof (Type)>
struct BEInt;
template <typename Type>
@ -101,20 +114,25 @@ struct BEInt<Type, 1>
template <typename Type>
struct BEInt<Type, 2>
{
struct __attribute__((packed)) packed_uint16_t { uint16_t v; };
public:
BEInt () = default;
constexpr BEInt (Type V) : v {uint8_t ((V >> 8) & 0xFF),
uint8_t ((V ) & 0xFF)} {}
struct __attribute__((packed)) packed_uint16_t { uint16_t v; };
BEInt (Type V)
#if HB_FAST_INT_ACCESS
#if __BYTE_ORDER == __LITTLE_ENDIAN
{ ((packed_uint16_t *) v)->v = __builtin_bswap16 (V); }
#else /* __BYTE_ORDER == __BIG_ENDIAN */
{ ((packed_uint16_t *) v)->v = V; }
#endif
#else
: v {uint8_t ((V >> 8) & 0xFF),
uint8_t ((V ) & 0xFF)} {}
#endif
constexpr operator Type () const {
#if defined(__OPTIMIZE__) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __BIG_ENDIAN || \
(__BYTE_ORDER == __LITTLE_ENDIAN && \
hb_has_builtin(__builtin_bswap16)))
/* Spoon-feed the compiler a big-endian integer with alignment 1.
* https://github.com/harfbuzz/harfbuzz/pull/1398 */
#if HB_FAST_INT_ACCESS
#if __BYTE_ORDER == __LITTLE_ENDIAN
return __builtin_bswap16 (((packed_uint16_t *) v)->v);
#else /* __BYTE_ORDER == __BIG_ENDIAN */
@ -145,22 +163,27 @@ struct BEInt<Type, 3>
template <typename Type>
struct BEInt<Type, 4>
{
struct __attribute__((packed)) packed_uint32_t { uint32_t v; };
public:
BEInt () = default;
constexpr BEInt (Type V) : v {uint8_t ((V >> 24) & 0xFF),
uint8_t ((V >> 16) & 0xFF),
uint8_t ((V >> 8) & 0xFF),
uint8_t ((V ) & 0xFF)} {}
struct __attribute__((packed)) packed_uint32_t { uint32_t v; };
BEInt (Type V)
#if HB_FAST_INT_ACCESS
#if __BYTE_ORDER == __LITTLE_ENDIAN
{ ((packed_uint32_t *) v)->v = __builtin_bswap32 (V); }
#else /* __BYTE_ORDER == __BIG_ENDIAN */
{ ((packed_uint32_t *) v)->v = V; }
#endif
#else
: v {uint8_t ((V >> 24) & 0xFF),
uint8_t ((V >> 16) & 0xFF),
uint8_t ((V >> 8) & 0xFF),
uint8_t ((V ) & 0xFF)} {}
#endif
constexpr operator Type () const {
#if defined(__OPTIMIZE__) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __BIG_ENDIAN || \
(__BYTE_ORDER == __LITTLE_ENDIAN && \
hb_has_builtin(__builtin_bswap32)))
/* Spoon-feed the compiler a big-endian integer with alignment 1.
* https://github.com/harfbuzz/harfbuzz/pull/1398 */
#if HB_FAST_INT_ACCESS
#if __BYTE_ORDER == __LITTLE_ENDIAN
return __builtin_bswap32 (((packed_uint32_t *) v)->v);
#else /* __BYTE_ORDER == __BIG_ENDIAN */