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volatile override
[folly.git]
/
folly
/
Bits.h
diff --git
a/folly/Bits.h
b/folly/Bits.h
index 58833106ebe031a258dd2722d06338e3d1b10837..b22b8d57899801d9cfa76484220789d5930e00e6 100644
(file)
--- a/
folly/Bits.h
+++ b/
folly/Bits.h
@@
-1,5
+1,5
@@
/*
/*
- * Copyright 201
3
Facebook, Inc.
+ * Copyright 201
4
Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@
-55,31
+55,31
@@
#ifndef FOLLY_BITS_H_
#define FOLLY_BITS_H_
#ifndef FOLLY_BITS_H_
#define FOLLY_BITS_H_
-#include "folly/Portability.h"
-
-#ifndef __GNUC__
-#error GCC required
-#endif
-
-#ifndef __clang__
+#if !defined(__clang__) && !defined(_MSC_VER)
#define FOLLY_INTRINSIC_CONSTEXPR constexpr
#else
#define FOLLY_INTRINSIC_CONSTEXPR constexpr
#else
-//
Unlike GCC, in Clang (as of 3.2) intrinsics aren't
constexpr.
+//
GCC is the only compiler with intrinsics
constexpr.
#define FOLLY_INTRINSIC_CONSTEXPR const
#endif
#define FOLLY_INTRINSIC_CONSTEXPR const
#endif
-#ifndef FOLLY_NO_CONFIG
-#include "folly/folly-config.h"
-#endif
+#include <folly/Portability.h>
-#include
"folly/detail/BitsDetail.h"
-#include
"folly/detail/BitIteratorDetail.h"
-#include
"folly/Likely.h"
+#include
<folly/detail/BitsDetail.h>
+#include
<folly/detail/BitIteratorDetail.h>
+#include
<folly/Likely.h>
#if FOLLY_HAVE_BYTESWAP_H
# include <byteswap.h>
#endif
#if FOLLY_HAVE_BYTESWAP_H
# include <byteswap.h>
#endif
+#ifdef _MSC_VER
+# include <intrin.h>
+# pragma intrinsic(_BitScanForward)
+# pragma intrinsic(_BitScanForward64)
+# pragma intrinsic(_BitScanReverse)
+# pragma intrinsic(_BitScanReverse64)
+#endif
+
#include <cassert>
#include <cinttypes>
#include <iterator>
#include <cassert>
#include <cinttypes>
#include <iterator>
@@
-100,7
+100,12
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned int)),
unsigned int>::type
findFirstSet(T x) {
sizeof(T) <= sizeof(unsigned int)),
unsigned int>::type
findFirstSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ return _BitScanForward(&index, x) ? index : 0;
+#else
return __builtin_ffs(x);
return __builtin_ffs(x);
+#endif
}
template <class T>
}
template <class T>
@@
-112,7
+117,12
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned long)),
unsigned int>::type
findFirstSet(T x) {
sizeof(T) <= sizeof(unsigned long)),
unsigned int>::type
findFirstSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ return _BitScanForward(&index, x) ? index : 0;
+#else
return __builtin_ffsl(x);
return __builtin_ffsl(x);
+#endif
}
template <class T>
}
template <class T>
@@
-124,7
+134,12
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned long long)),
unsigned int>::type
findFirstSet(T x) {
sizeof(T) <= sizeof(unsigned long long)),
unsigned int>::type
findFirstSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ return _BitScanForward64(&index, x) ? index : 0;
+#else
return __builtin_ffsll(x);
return __builtin_ffsll(x);
+#endif
}
template <class T>
}
template <class T>
@@
-149,7
+164,18
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned int)),
unsigned int>::type
findLastSet(T x) {
sizeof(T) <= sizeof(unsigned int)),
unsigned int>::type
findLastSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ int clz;
+ if (_BitScanReverse(&index, x)) {
+ clz = static_cast<int>(31 - index);
+ } else {
+ clz = 32;
+ }
+ return x ? 8 * sizeof(unsigned int) - clz : 0;
+#else
return x ? 8 * sizeof(unsigned int) - __builtin_clz(x) : 0;
return x ? 8 * sizeof(unsigned int) - __builtin_clz(x) : 0;
+#endif
}
template <class T>
}
template <class T>
@@
-161,7
+187,18
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned long)),
unsigned int>::type
findLastSet(T x) {
sizeof(T) <= sizeof(unsigned long)),
unsigned int>::type
findLastSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ int clz;
+ if (_BitScanReverse(&index, x)) {
+ clz = static_cast<int>(31 - index);
+ } else {
+ clz = 32;
+ }
+ return x ? 8 * sizeof(unsigned int) - clz : 0;
+#else
return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0;
return x ? 8 * sizeof(unsigned long) - __builtin_clzl(x) : 0;
+#endif
}
template <class T>
}
template <class T>
@@
-173,7
+210,18
@@
typename std::enable_if<
sizeof(T) <= sizeof(unsigned long long)),
unsigned int>::type
findLastSet(T x) {
sizeof(T) <= sizeof(unsigned long long)),
unsigned int>::type
findLastSet(T x) {
+#ifdef _MSC_VER
+ unsigned long index;
+ unsigned long long clz;
+ if (_BitScanReverse(&index, x)) {
+ clz = static_cast<unsigned long long>(63 - index);
+ } else {
+ clz = 64;
+ }
+ return x ? 8 * sizeof(unsigned long long) - clz : 0;
+#else
return x ? 8 * sizeof(unsigned long long) - __builtin_clzll(x) : 0;
return x ? 8 * sizeof(unsigned long long) - __builtin_clzll(x) : 0;
+#endif
}
template <class T>
}
template <class T>
@@
-239,6
+287,8
@@
struct EndianIntBase {
static T swap(T x);
};
static T swap(T x);
};
+#ifndef _MSC_VER
+
/**
* If we have the bswap_16 macro from byteswap.h, use it; otherwise, provide our
* own definition.
/**
* If we have the bswap_16 macro from byteswap.h, use it; otherwise, provide our
* own definition.
@@
-256,6
+306,8
@@
our_bswap16(Int16 x) {
}
#endif
}
#endif
+#endif
+
#define FB_GEN(t, fn) \
template<> inline t EndianIntBase<t>::swap(t x) { return fn(x); }
#define FB_GEN(t, fn) \
template<> inline t EndianIntBase<t>::swap(t x) { return fn(x); }
@@
-264,12
+316,21
@@
template<> inline t EndianIntBase<t>::swap(t x) { return fn(x); }
// __builtin_bswap16 for some reason, so we have to provide our own.
FB_GEN( int8_t,)
FB_GEN(uint8_t,)
// __builtin_bswap16 for some reason, so we have to provide our own.
FB_GEN( int8_t,)
FB_GEN(uint8_t,)
+#ifdef _MSC_VER
+FB_GEN( int64_t, _byteswap_uint64)
+FB_GEN(uint64_t, _byteswap_uint64)
+FB_GEN( int32_t, _byteswap_ulong)
+FB_GEN(uint32_t, _byteswap_ulong)
+FB_GEN( int16_t, _byteswap_ushort)
+FB_GEN(uint16_t, _byteswap_ushort)
+#else
FB_GEN( int64_t, __builtin_bswap64)
FB_GEN(uint64_t, __builtin_bswap64)
FB_GEN( int32_t, __builtin_bswap32)
FB_GEN(uint32_t, __builtin_bswap32)
FB_GEN( int16_t, our_bswap16)
FB_GEN(uint16_t, our_bswap16)
FB_GEN( int64_t, __builtin_bswap64)
FB_GEN(uint64_t, __builtin_bswap64)
FB_GEN( int32_t, __builtin_bswap32)
FB_GEN(uint32_t, __builtin_bswap32)
FB_GEN( int16_t, our_bswap16)
FB_GEN(uint16_t, our_bswap16)
+#endif
#undef FB_GEN
#undef FB_GEN
@@
-341,10
+402,12
@@
class Endian {
return detail::EndianInt<T>::little(x);
}
return detail::EndianInt<T>::little(x);
}
+#if !defined(__ANDROID__)
FB_GEN(64)
FB_GEN(32)
FB_GEN(16)
FB_GEN(8)
FB_GEN(64)
FB_GEN(32)
FB_GEN(16)
FB_GEN(8)
+#endif
};
#undef FB_GEN
};
#undef FB_GEN
@@
-524,6
+587,7
@@
template <class T, class Enable=void> struct Unaligned;
/**
* Representation of an unaligned value of a POD type.
*/
/**
* Representation of an unaligned value of a POD type.
*/
+FOLLY_PACK_PUSH
template <class T>
struct Unaligned<
T,
template <class T>
struct Unaligned<
T,
@@
-531,7
+595,8
@@
struct Unaligned<
Unaligned() = default; // uninitialized
/* implicit */ Unaligned(T v) : value(v) { }
T value;
Unaligned() = default; // uninitialized
/* implicit */ Unaligned(T v) : value(v) { }
T value;
-} __attribute__((packed));
+} FOLLY_PACK_ATTR;
+FOLLY_PACK_POP
/**
* Read an unaligned value of type T and return it.
/**
* Read an unaligned value of type T and return it.