/*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
-
-
-#include "RangeSse42.h"
+#include <folly/detail/RangeSse42.h>
#include <glog/logging.h>
-#include <folly/Portability.h>
-
+#include <folly/Portability.h>
// Essentially, two versions of this file: one with an SSE42 implementation
// and one with a fallback implementation. We determine which version to use by
//
// TODO: Maybe this should be done by the build system....
#if !FOLLY_SSE_PREREQ(4, 2)
-
-
-
namespace folly {
-
namespace detail {
-
-size_t qfind_first_byte_of_sse42(const StringPieceLite haystack,
- const StringPieceLite needles) {
- CHECK(false) << "Function " << __func__ << " only works with SSE42!";
+size_t qfind_first_byte_of_sse42(
+ const StringPieceLite haystack,
+ const StringPieceLite needles) {
return qfind_first_byte_of_nosse(haystack, needles);
}
-
-}
-
-}
-
-
-
-# else
-
-
-
+} // namespace detail
+} // namespace folly
+#else
#include <cstdint>
#include <limits>
#include <string>
+
#include <emmintrin.h>
+#include <nmmintrin.h>
#include <smmintrin.h>
+
#include <folly/Likely.h>
// GCC 4.9 with ASAN has a problem: a function with no_sanitize_address calling
// a function with always_inline fails to build. The _mm_* functions are marked
// always_inline.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
-#if defined FOLLY_SANITIZE_ADDRESS && \
- FOLLY_SANITIZE_ADDRESS == 1 && \
+#if defined FOLLY_SANITIZE_ADDRESS && FOLLY_SANITIZE_ADDRESS == 1 && \
__GNUC_PREREQ(4, 9)
-# define _mm_load_si128(p) (*(p))
-# define _mm_loadu_si128(p) ((__m128i)__builtin_ia32_loaddqu((const char*)(p)))
+#define _mm_load_si128(p) (*(p))
+#define _mm_loadu_si128(p) ((__m128i)__builtin_ia32_loaddqu((const char*)(p)))
+#ifdef _mm_cmpestri
+#undef _mm_cmpestri
+#endif
+#define _mm_cmpestri(a, b, c, d, e) \
+ __builtin_ia32_pcmpestri128((__v16qi)(a), b, (__v16qi)(c), d, e)
#endif
namespace folly {
-
namespace detail {
// It's okay if pages are bigger than this (as powers of two), but they should
// not be smaller.
static constexpr size_t kMinPageSize = 4096;
-static_assert(kMinPageSize >= 16,
- "kMinPageSize must be at least SSE register size");
+static_assert(
+ kMinPageSize >= 16,
+ "kMinPageSize must be at least SSE register size");
template <typename T>
static inline uintptr_t page_for(T* addr) {
}
static inline size_t nextAlignedIndex(const char* arr) {
- auto firstPossible = reinterpret_cast<uintptr_t>(arr) + 1;
- return 1 + // add 1 because the index starts at 'arr'
- ((firstPossible + 15) & ~0xF) // round up to next multiple of 16
- - firstPossible;
+ auto firstPossible = reinterpret_cast<uintptr_t>(arr) + 1;
+ return 1 + // add 1 because the index starts at 'arr'
+ ((firstPossible + 15) & ~0xF) // round up to next multiple of 16
+ - firstPossible;
}
-static size_t qfind_first_byte_of_needles16(const StringPieceLite haystack,
- const StringPieceLite needles)
- FOLLY_DISABLE_ADDRESS_SANITIZER;
+static size_t qfind_first_byte_of_needles16(
+ const StringPieceLite haystack,
+ const StringPieceLite needles) FOLLY_DISABLE_ADDRESS_SANITIZER;
// helper method for case where needles.size() <= 16
-size_t qfind_first_byte_of_needles16(const StringPieceLite haystack,
- const StringPieceLite needles) {
- DCHECK_GT(haystack.size(), 0);
- DCHECK_GT(needles.size(), 0);
- DCHECK_LE(needles.size(), 16);
+size_t qfind_first_byte_of_needles16(
+ const StringPieceLite haystack,
+ const StringPieceLite needles) {
+ DCHECK_GT(haystack.size(), 0u);
+ DCHECK_GT(needles.size(), 0u);
+ DCHECK_LE(needles.size(), 16u);
if ((needles.size() <= 2 && haystack.size() >= 256) ||
// must bail if we can't even SSE-load a single segment of haystack
(haystack.size() < 16 &&
return detail::qfind_first_byte_of_nosse(haystack, needles);
}
- auto arr2 = _mm_loadu_si128(
- reinterpret_cast<const __m128i*>(needles.data()));
+ auto arr2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(needles.data()));
// do an unaligned load for first block of haystack
- auto arr1 = _mm_loadu_si128(
- reinterpret_cast<const __m128i*>(haystack.data()));
- auto index = __builtin_ia32_pcmpestri128((__v16qi)arr2, needles.size(),
- (__v16qi)arr1, haystack.size(), 0);
+ auto arr1 =
+ _mm_loadu_si128(reinterpret_cast<const __m128i*>(haystack.data()));
+ auto index =
+ _mm_cmpestri(arr2, int(needles.size()), arr1, int(haystack.size()), 0);
if (index < 16) {
- return index;
+ return size_t(index);
}
// Now, we can do aligned loads hereafter...
size_t i = nextAlignedIndex(haystack.data());
- for (; i < haystack.size(); i+= 16) {
- auto arr1 = _mm_load_si128(
- reinterpret_cast<const __m128i*>(haystack.data() + i));
- auto index = __builtin_ia32_pcmpestri128(
- (__v16qi)arr2, needles.size(),
- (__v16qi)arr1, haystack.size() - i, 0);
+ for (; i < haystack.size(); i += 16) {
+ arr1 =
+ _mm_load_si128(reinterpret_cast<const __m128i*>(haystack.data() + i));
+ index = _mm_cmpestri(
+ arr2, int(needles.size()), arr1, int(haystack.size() - i), 0);
if (index < 16) {
return i + index;
}
}
template <bool HAYSTACK_ALIGNED>
-size_t scanHaystackBlock(const StringPieceLite haystack,
- const StringPieceLite needles,
- uint64_t idx)
-// Turn off ASAN because the "arr2 = ..." assignment in the loop below reads
-// up to 15 bytes beyond end of the buffer in #needles#. That is ok because
-// ptr2 is always 16-byte aligned, so the read can never span a page boundary.
-// Also, the extra data that may be read is never actually used.
- FOLLY_DISABLE_ADDRESS_SANITIZER;
+size_t scanHaystackBlock(
+ const StringPieceLite haystack,
+ const StringPieceLite needles,
+ uint64_t idx)
+ // Turn off ASAN because the "arr2 = ..." assignment in the loop below reads
+ // up to 15 bytes beyond end of the buffer in #needles#. That is ok because
+ // ptr2 is always 16-byte aligned, so the read can never span a page
+ // boundary. Also, the extra data that may be read is never actually used.
+ FOLLY_DISABLE_ADDRESS_SANITIZER;
// Scans a 16-byte block of haystack (starting at blockStartIdx) to find first
// needle. If HAYSTACK_ALIGNED, then haystack must be 16byte aligned.
// If !HAYSTACK_ALIGNED, then caller must ensure that it is safe to load the
// block.
template <bool HAYSTACK_ALIGNED>
-size_t scanHaystackBlock(const StringPieceLite haystack,
- const StringPieceLite needles,
- uint64_t blockStartIdx) {
- DCHECK_GT(needles.size(), 16); // should handled by *needles16() method
- DCHECK(blockStartIdx + 16 <= haystack.size() ||
- (page_for(haystack.data() + blockStartIdx) ==
- page_for(haystack.data() + blockStartIdx + 15)));
+size_t scanHaystackBlock(
+ const StringPieceLite haystack,
+ const StringPieceLite needles,
+ uint64_t blockStartIdx) {
+ DCHECK_GT(needles.size(), 16u); // should handled by *needles16() method
+ DCHECK(
+ blockStartIdx + 16 <= haystack.size() ||
+ (page_for(haystack.data() + blockStartIdx) ==
+ page_for(haystack.data() + blockStartIdx + 15)));
__m128i arr1;
if (HAYSTACK_ALIGNED) {
}
// This load is safe because needles.size() >= 16
- auto arr2 = _mm_loadu_si128(
- reinterpret_cast<const __m128i*>(needles.data()));
- size_t b = __builtin_ia32_pcmpestri128(
- (__v16qi)arr2, 16, (__v16qi)arr1, haystack.size() - blockStartIdx, 0);
+ auto arr2 = _mm_loadu_si128(reinterpret_cast<const __m128i*>(needles.data()));
+ auto b =
+ _mm_cmpestri(arr2, 16, arr1, int(haystack.size() - blockStartIdx), 0);
size_t j = nextAlignedIndex(needles.data());
for (; j < needles.size(); j += 16) {
- arr2 = _mm_load_si128(
- reinterpret_cast<const __m128i*>(needles.data() + j));
-
- auto index = __builtin_ia32_pcmpestri128(
- (__v16qi)arr2, needles.size() - j,
- (__v16qi)arr1, haystack.size() - blockStartIdx, 0);
- b = std::min<size_t>(index, b);
+ arr2 = _mm_load_si128(reinterpret_cast<const __m128i*>(needles.data() + j));
+
+ auto index = _mm_cmpestri(
+ arr2,
+ int(needles.size() - j),
+ arr1,
+ int(haystack.size() - blockStartIdx),
+ 0);
+ b = std::min(index, b);
}
if (b < 16) {
return std::string::npos;
}
-size_t qfind_first_byte_of_sse42(const StringPieceLite haystack,
- const StringPieceLite needles);
+size_t qfind_first_byte_of_sse42(
+ const StringPieceLite haystack,
+ const StringPieceLite needles);
-size_t qfind_first_byte_of_sse42(const StringPieceLite haystack,
- const StringPieceLite needles) {
+size_t qfind_first_byte_of_sse42(
+ const StringPieceLite haystack,
+ const StringPieceLite needles) {
if (UNLIKELY(needles.empty() || haystack.empty())) {
return std::string::npos;
} else if (needles.size() <= 16) {
size_t i = nextAlignedIndex(haystack.data());
for (; i < haystack.size(); i += 16) {
- auto ret = scanHaystackBlock<true>(haystack, needles, i);
+ ret = scanHaystackBlock<true>(haystack, needles, i);
if (ret != std::string::npos) {
return ret;
}
return std::string::npos;
}
-
}
-
}
-
-
-
#endif