/*
- * 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 <glog/logging.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
// testing for the presence of the required headers.
//
// 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!";
return qfind_first_byte_of_nosse(haystack, needles);
}
-
}
-
}
-
-
-
# else
-
-
-
#include <cstdint>
#include <limits>
#include <string>
+
#include <emmintrin.h>
+#include <nmmintrin.h>
#include <smmintrin.h>
+
#include <folly/Likely.h>
-namespace folly {
+// 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 && \
+ __GNUC_PREREQ(4, 9)
+# 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
// 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);
+ 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(
+ 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(
+ 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 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);
+ 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;
}
size_t scanHaystackBlock(const StringPieceLite haystack,
const StringPieceLite needles,
uint64_t blockStartIdx) {
- DCHECK_GT(needles.size(), 16); // should handled by *needles16() method
+ 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) {
- arr1 = ::_mm_load_si128(
+ arr1 = _mm_load_si128(
reinterpret_cast<const __m128i*>(haystack.data() + blockStartIdx));
} else {
- arr1 = ::_mm_loadu_si128(
+ arr1 = _mm_loadu_si128(
reinterpret_cast<const __m128i*>(haystack.data() + blockStartIdx));
}
// This load is safe because needles.size() >= 16
- auto arr2 = ::_mm_loadu_si128(
+ 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 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(
+ 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);
+ auto index = _mm_cmpestri(
+ arr2,
+ int(needles.size() - j),
+ arr1,
+ int(haystack.size() - blockStartIdx),
+ 0);
+ b = std::min(index, b);
}
if (b < 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
projects / folly.git / blobdiff