/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#ifndef FOLLY_GROUPVARINT_H_
#define FOLLY_GROUPVARINT_H_
-#ifndef __GNUC__
-#error GroupVarint.h requires GCC
+#if !defined(__GNUC__) && !defined(_MSC_VER)
+#error GroupVarint.h requires GCC or MSVC
#endif
-#include "folly/Portability.h"
+#include <folly/Portability.h>
#if FOLLY_X64 || defined(__i386__)
#define HAVE_GROUP_VARINT 1
#include <cstdint>
#include <limits>
-#include "folly/detail/GroupVarintDetail.h"
-#include "folly/Bits.h"
-#include "folly/Range.h"
+#include <folly/detail/GroupVarintDetail.h>
+#include <folly/Bits.h>
+#include <folly/Range.h>
#include <glog/logging.h>
-#ifdef __SSSE3__
+#if FOLLY_SSE >= 3
#include <x86intrin.h>
namespace folly {
namespace detail {
p += k2+1;
size_t k3 = b3key(k);
*d = loadUnaligned<uint32_t>(p) & kMask[k3];
- p += k3+1;
+ // p += k3+1;
return end;
}
return decode_simple(p, dest, dest+1, dest+2, dest+3);
}
-#ifdef __SSSE3__
+#if FOLLY_SSE >= 3
+ /**
+ * Just like the non-SSSE3 decode below, but with the additional constraint
+ * that we must be able to read at least 17 bytes from the input pointer, p.
+ */
static const char* decode(const char* p, uint32_t* dest) {
uint8_t key = p[0];
__m128i val = _mm_loadu_si128((const __m128i*)(p+1));
return p + detail::groupVarintLengths[key];
}
+ /**
+ * Just like decode_simple, but with the additional constraint that
+ * we must be able to read at least 17 bytes from the input pointer, p.
+ */
static const char* decode(const char* p, uint32_t* a, uint32_t* b,
uint32_t* c, uint32_t* d) {
uint8_t key = p[0];
__m128i r = _mm_shuffle_epi8(val, mask);
// Extracting 32 bits at a time out of an XMM register is a SSE4 feature
-#ifdef __SSE4__
+#if FOLLY_SSE >= 4
*a = _mm_extract_epi32(r, 0);
*b = _mm_extract_epi32(r, 1);
*c = _mm_extract_epi32(r, 2);
typedef GroupVarint<T> Base;
typedef T type;
- GroupVarintDecoder() { }
+ GroupVarintDecoder() = default;
explicit GroupVarintDecoder(StringPiece data,
size_t maxCount = (size_t)-1)
#endif /* FOLLY_X64 || defined(__i386__) */
#endif /* FOLLY_GROUPVARINT_H_ */
-