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-rw-r--r--src/osd/eivcarm.h75
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diff --git a/src/osd/eivcarm.h b/src/osd/eivcarm.h
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+// license:BSD-3-Clause
+// copyright-holders:Vas Crabb
+//============================================================
+//
+// eivcarm.h
+//
+// ARM/AArch64 inline implementations for MSVC compiler.
+//
+//============================================================
+
+#ifndef MAME_OSD_EIVCARM_H
+#define MAME_OSD_EIVCARM_H
+
+#pragma once
+
+#include <intrin.h>
+
+#pragma intrinsic(_CountLeadingZeros)
+#pragma intrinsic(_CountLeadingZeros64)
+#pragma intrinsic(_CountLeadingOnes)
+#pragma intrinsic(_CountLeadingOnes64)
+
+
+/***************************************************************************
+ INLINE BIT MANIPULATION FUNCTIONS
+***************************************************************************/
+
+/*-------------------------------------------------
+ count_leading_zeros_32 - return the number of
+ leading zero bits in a 32-bit value
+-------------------------------------------------*/
+
+#define count_leading_zeros_32 _count_leading_zeros_32
+__forceinline uint8_t _count_leading_zeros_32(uint32_t value)
+{
+ return uint8_t(_CountLeadingZeros(value));
+}
+
+
+/*-------------------------------------------------
+ count_leading_ones_32 - return the number of
+ leading one bits in a 32-bit value
+-------------------------------------------------*/
+
+#define count_leading_ones_32 _count_leading_ones_32
+__forceinline uint8_t _count_leading_ones_32(uint32_t value)
+{
+ return uint8_t(_CountLeadingOnes(value));
+}
+
+
+/*-------------------------------------------------
+ count_leading_zeros_64 - return the number of
+ leading zero bits in a 64-bit value
+-------------------------------------------------*/
+
+#define count_leading_zeros_64 _count_leading_zeros_64
+__forceinline uint8_t _count_leading_zeros_64(uint64_t value)
+{
+ return uint8_t(_CountLeadingZeros64(value));
+}
+
+
+/*-------------------------------------------------
+ count_leading_ones_64 - return the number of
+ leading one bits in a 64-bit value
+-------------------------------------------------*/
+
+#define count_leading_ones_64 _count_leading_ones_64
+__forceinline uint8_t _count_leading_ones_64(uint64_t value)
+{
+ return uint8_t(_CountLeadingOnes64(value));
+}
+
+#endif // MAME_OSD_EIVCARM_H