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Use __has_builtin for builtin checks instead of compiler versions 

https://github.com/harfbuzz/harfbuzz/issues/4066#issuecomment-1439510188
This commit is contained in:
Behdad Esfahbod 2023-02-22 08:08:11 -07:00
parent 6b286cfabf
commit 5bc6ab006d
2 changed files with 31 additions and 9 deletions
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30
src/hb-algs.hh
View File

@ -110,9 +110,10 @@ struct BEInt<Type, 2>
constexpr operator Type () const
{
#if defined(__OPTIMIZE__) && !defined(HB_NO_PACKED) && \
((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__)) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __BIG_ENDIAN)
(__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 __BYTE_ORDER == __LITTLE_ENDIAN
@ -155,9 +156,10 @@ struct BEInt<Type, 4>
struct __attribute__((packed)) packed_uint32_t { uint32_t v; };
constexpr operator Type () const {
#if defined(__OPTIMIZE__) && !defined(HB_NO_PACKED) && \
((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__)) && \
defined(__BYTE_ORDER) && \
(__BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __BIG_ENDIAN)
(__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 __BYTE_ORDER == __LITTLE_ENDIAN
@ -598,13 +600,17 @@ template <typename T>
static inline unsigned int
hb_popcount (T v)
{
#if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)
#if hb_has_builtin(__builtin_popcount)
if (sizeof (T) <= sizeof (unsigned int))
return __builtin_popcount (v);
#endif
#if hb_has_builtin(__builtin_popcountl)
if (sizeof (T) <= sizeof (unsigned long))
return __builtin_popcountl (v);
#endif
#if hb_has_builtin(__builtin_popcountll)
if (sizeof (T) <= sizeof (unsigned long long))
return __builtin_popcountll (v);
#endif
@ -641,13 +647,17 @@ hb_bit_storage (T v)
{
if (unlikely (!v)) return 0;
#if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)
#if hb_has_builtin(__builtin_clz)
if (sizeof (T) <= sizeof (unsigned int))
return sizeof (unsigned int) * 8 - __builtin_clz (v);
#endif
#if hb_has_builtin(__builtin_clzl)
if (sizeof (T) <= sizeof (unsigned long))
return sizeof (unsigned long) * 8 - __builtin_clzl (v);
#endif
#if hb_has_builtin(__builtin_clzll)
if (sizeof (T) <= sizeof (unsigned long long))
return sizeof (unsigned long long) * 8 - __builtin_clzll (v);
#endif
@ -715,13 +725,17 @@ hb_ctz (T v)
{
if (unlikely (!v)) return 8 * sizeof (T);
#if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)
#if hb_has_builtin(__builtin_ctz)
if (sizeof (T) <= sizeof (unsigned int))
return __builtin_ctz (v);
#endif
#if hb_has_builtin(__builtin_ctzl)
if (sizeof (T) <= sizeof (unsigned long))
return __builtin_ctzl (v);
#endif
#if hb_has_builtin(__builtin_ctzll)
if (sizeof (T) <= sizeof (unsigned long long))
return __builtin_ctzll (v);
#endif
@ -875,7 +889,7 @@ hb_in_ranges (T u, T lo1, T hi1, Ts... ds)
static inline bool
hb_unsigned_mul_overflows (unsigned int count, unsigned int size, unsigned *result = nullptr)
{
#if (defined(__GNUC__) && (__GNUC__ >= 4)) || (defined(__clang__) && (__clang_major__ >= 8))
#if hb_has_builtin(__builtin_mul_overflow)
unsigned stack_result;
if (!result)
result = &stack_result;

10
src/hb.hh
View File

@ -246,7 +246,15 @@ extern "C" void hb_free_impl(void *ptr);
* Compiler attributes
*/
#if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
// gcc 10 has __has_builtin but not earlier versions. Sanction any gcc >= 5
// clang defines it so no need.
#ifdef __has_builtin
#define hb_has_builtin __has_builtin
#else
#define hb_has_builtin(x) ((defined(__GNUC__) && __GNUC__ >= 5))
#endif
#if defined(__OPTIMIZE__) && hb_has_builtin(__builtin_expect)
#define likely(expr) (__builtin_expect (!!(expr), 1))
#define unlikely(expr) (__builtin_expect (!!(expr), 0))
#else