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Diffstat (limited to 'src/osd/eigcc.h')
-rw-r--r-- | src/osd/eigcc.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/osd/eigcc.h b/src/osd/eigcc.h new file mode 100644 index 00000000000..2c5bf34ba72 --- /dev/null +++ b/src/osd/eigcc.h @@ -0,0 +1,148 @@ +// license:BSD-3-Clause +// copyright-holders:Vas Crabb +/*************************************************************************** + + eigccppc.h + + Inline implementations for GCC compilers. This code is automatically + included if appropriate by eminline.h. + +***************************************************************************/ + +#ifndef MAME_OSD_EIGCC_H +#define MAME_OSD_EIGCC_H + +#include <cassert> + + +/*************************************************************************** + INLINE MATH FUNCTIONS +***************************************************************************/ + +/*------------------------------------------------- + addu_32x32_co - perform an unsigned 32 bit + 32 + bit addition and return the result with carry + out +-------------------------------------------------*/ + +#ifndef addu_32x32_co +#define addu_32x32_co _addu_32x32_co +inline bool _addu_32x32_co(uint32_t a, uint32_t b, uint32_t &sum) +{ + return __builtin_add_overflow(a, b, &sum); +} +#endif + + +/*------------------------------------------------- + addu_64x64_co - perform an unsigned 64 bit + 64 + bit addition and return the result with carry + out +-------------------------------------------------*/ + +#ifndef addu_64x64_co +#define addu_64x64_co _addu_64x64_co +inline bool _addu_64x64_co(uint64_t a, uint64_t b, uint64_t &sum) +{ + return __builtin_add_overflow(a, b, &sum); +} +#endif + + + +/*************************************************************************** + INLINE BIT MANIPULATION FUNCTIONS +***************************************************************************/ + +/*------------------------------------------------- + count_leading_zeros_32 - return the number of + leading zero bits in a 32-bit value +-------------------------------------------------*/ + +#ifndef count_leading_zeros_32 +#define count_leading_zeros_32 _count_leading_zeros_32 +inline uint8_t _count_leading_zeros_32(uint32_t val) +{ + // uses CPU feature if available, otherwise falls back to runtime library call + static_assert(sizeof(val) == sizeof(unsigned), "expected 32-bit unsigned int"); + return uint8_t(unsigned(val ? __builtin_clz(val) : 32)); +} +#endif + + +/*------------------------------------------------- + count_leading_ones_32 - return the number of + leading one bits in a 32-bit value +-------------------------------------------------*/ + +#ifndef count_leading_ones_32 +#define count_leading_ones_32 _count_leading_ones_32 +inline uint8_t _count_leading_ones_32(uint32_t val) +{ + return count_leading_zeros_32(~val); +} +#endif + + +/*------------------------------------------------- + count_leading_zeros_64 - return the number of + leading zero bits in a 64-bit value +-------------------------------------------------*/ + +#ifndef count_leading_zeros_64 +#define count_leading_zeros_64 _count_leading_zeros_64 +inline uint8_t _count_leading_zeros_64(uint64_t val) +{ + // uses CPU feature if available, otherwise falls back to runtime library call + static_assert(sizeof(val) == sizeof(unsigned long long), "expected 64-bit unsigned long long int"); + return uint8_t(unsigned(val ? __builtin_clzll(val) : 64)); +} +#endif + + +/*------------------------------------------------- + count_leading_ones_64 - return the number of + leading one bits in a 64-bit value +-------------------------------------------------*/ + +#ifndef count_leading_ones_64 +#define count_leading_ones_64 _count_leading_ones_64 +inline uint8_t _count_leading_ones_64(uint64_t val) +{ + return count_leading_zeros_64(~val); +} +#endif + + +/*------------------------------------------------- + population_count_32 - return the number of + one bits in a 32-bit value +-------------------------------------------------*/ + +#ifndef population_count_32 +#define population_count_32 _population_count_32 +inline unsigned _population_count_32(uint32_t val) +{ + // uses CPU feature if available, otherwise falls back to implementation similar to eminline.h + static_assert(sizeof(val) == sizeof(unsigned), "expected 32-bit unsigned int"); + return unsigned(__builtin_popcount(static_cast<unsigned>(val))); +} +#endif + + +/*------------------------------------------------- + population_count_64 - return the number of + one bits in a 64-bit value +-------------------------------------------------*/ + +#ifndef population_count_64 +#define population_count_64 _population_count_64 +inline unsigned _population_count_64(uint64_t val) +{ + // uses CPU feature if available, otherwise falls back to implementation similar to eminline.h + static_assert(sizeof(val) == sizeof(unsigned long long), "expected 64-bit unsigned long long int"); + return unsigned(__builtin_popcountll(static_cast<unsigned long long>(val))); +} +#endif + +#endif // MAME_OSD_EIGCC_H |