mirror of
https://github.com/holub/mame
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149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
// license:BSD-3-Clause
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// copyright-holders:Vas Crabb
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/***************************************************************************
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eigccppc.h
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Inline implementations for GCC compilers. This code is automatically
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included if appropriate by eminline.h.
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***************************************************************************/
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#ifndef MAME_OSD_EIGCC_H
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#define MAME_OSD_EIGCC_H
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#include <cassert>
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/***************************************************************************
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INLINE MATH FUNCTIONS
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***************************************************************************/
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/*-------------------------------------------------
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addu_32x32_co - perform an unsigned 32 bit + 32
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bit addition and return the result with carry
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out
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-------------------------------------------------*/
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#ifndef addu_32x32_co
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#define addu_32x32_co _addu_32x32_co
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inline bool _addu_32x32_co(uint32_t a, uint32_t b, uint32_t &sum)
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{
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return __builtin_add_overflow(a, b, &sum);
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}
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#endif
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/*-------------------------------------------------
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addu_64x64_co - perform an unsigned 64 bit + 64
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bit addition and return the result with carry
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out
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-------------------------------------------------*/
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#ifndef addu_64x64_co
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#define addu_64x64_co _addu_64x64_co
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inline bool _addu_64x64_co(uint64_t a, uint64_t b, uint64_t &sum)
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{
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return __builtin_add_overflow(a, b, &sum);
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}
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#endif
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/***************************************************************************
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INLINE BIT MANIPULATION FUNCTIONS
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***************************************************************************/
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/*-------------------------------------------------
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count_leading_zeros_32 - return the number of
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leading zero bits in a 32-bit value
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-------------------------------------------------*/
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#ifndef count_leading_zeros_32
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#define count_leading_zeros_32 _count_leading_zeros_32
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inline uint8_t _count_leading_zeros_32(uint32_t val)
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{
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// uses CPU feature if available, otherwise falls back to runtime library call
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static_assert(sizeof(val) == sizeof(unsigned), "expected 32-bit unsigned int");
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return uint8_t(unsigned(val ? __builtin_clz(val) : 32));
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}
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#endif
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/*-------------------------------------------------
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count_leading_ones_32 - return the number of
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leading one bits in a 32-bit value
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-------------------------------------------------*/
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#ifndef count_leading_ones_32
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#define count_leading_ones_32 _count_leading_ones_32
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inline uint8_t _count_leading_ones_32(uint32_t val)
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{
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return count_leading_zeros_32(~val);
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}
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#endif
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/*-------------------------------------------------
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count_leading_zeros_64 - return the number of
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leading zero bits in a 64-bit value
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-------------------------------------------------*/
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#ifndef count_leading_zeros_64
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#define count_leading_zeros_64 _count_leading_zeros_64
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inline uint8_t _count_leading_zeros_64(uint64_t val)
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{
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// uses CPU feature if available, otherwise falls back to runtime library call
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static_assert(sizeof(val) == sizeof(unsigned long long), "expected 64-bit unsigned long long int");
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return uint8_t(unsigned(val ? __builtin_clzll(val) : 64));
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}
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#endif
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/*-------------------------------------------------
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count_leading_ones_64 - return the number of
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leading one bits in a 64-bit value
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-------------------------------------------------*/
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#ifndef count_leading_ones_64
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#define count_leading_ones_64 _count_leading_ones_64
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inline uint8_t _count_leading_ones_64(uint64_t val)
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{
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return count_leading_zeros_64(~val);
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}
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#endif
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/*-------------------------------------------------
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population_count_32 - return the number of
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one bits in a 32-bit value
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-------------------------------------------------*/
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#ifndef population_count_32
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#define population_count_32 _population_count_32
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inline unsigned _population_count_32(uint32_t val)
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{
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// uses CPU feature if available, otherwise falls back to implementation similar to eminline.h
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static_assert(sizeof(val) == sizeof(unsigned), "expected 32-bit unsigned int");
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return unsigned(__builtin_popcount(static_cast<unsigned>(val)));
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}
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#endif
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/*-------------------------------------------------
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population_count_64 - return the number of
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one bits in a 64-bit value
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-------------------------------------------------*/
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#ifndef population_count_64
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#define population_count_64 _population_count_64
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inline unsigned _population_count_64(uint64_t val)
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{
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// uses CPU feature if available, otherwise falls back to implementation similar to eminline.h
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static_assert(sizeof(val) == sizeof(unsigned long long), "expected 64-bit unsigned long long int");
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return unsigned(__builtin_popcountll(static_cast<unsigned long long>(val)));
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}
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#endif
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#endif // MAME_OSD_EIGCC_H
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