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-rw-r--r--src/osd/eigcc.h148
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diff --git a/src/osd/eigcc.h b/src/osd/eigcc.h
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+++ b/src/osd/eigcc.h
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+// 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