mirror of
https://github.com/ziglang/zig.git
synced 2024-11-15 16:45:27 +00:00
127 lines
3.6 KiB
C++
Vendored
127 lines
3.6 KiB
C++
Vendored
//===-- tsan_vector_clock.cpp ---------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a part of ThreadSanitizer (TSan), a race detector.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#include "tsan_vector_clock.h"
|
|
|
|
#include "sanitizer_common/sanitizer_placement_new.h"
|
|
#include "tsan_mman.h"
|
|
|
|
namespace __tsan {
|
|
|
|
#if TSAN_VECTORIZE
|
|
const uptr kVectorClockSize = kThreadSlotCount * sizeof(Epoch) / sizeof(m128);
|
|
#endif
|
|
|
|
VectorClock::VectorClock() { Reset(); }
|
|
|
|
void VectorClock::Reset() {
|
|
#if !TSAN_VECTORIZE
|
|
for (uptr i = 0; i < kThreadSlotCount; i++)
|
|
clk_[i] = kEpochZero;
|
|
#else
|
|
m128 z = _mm_setzero_si128();
|
|
m128* vclk = reinterpret_cast<m128*>(clk_);
|
|
for (uptr i = 0; i < kVectorClockSize; i++) _mm_store_si128(&vclk[i], z);
|
|
#endif
|
|
}
|
|
|
|
void VectorClock::Acquire(const VectorClock* src) {
|
|
if (!src)
|
|
return;
|
|
#if !TSAN_VECTORIZE
|
|
for (uptr i = 0; i < kThreadSlotCount; i++)
|
|
clk_[i] = max(clk_[i], src->clk_[i]);
|
|
#else
|
|
m128* __restrict vdst = reinterpret_cast<m128*>(clk_);
|
|
m128 const* __restrict vsrc = reinterpret_cast<m128 const*>(src->clk_);
|
|
for (uptr i = 0; i < kVectorClockSize; i++) {
|
|
m128 s = _mm_load_si128(&vsrc[i]);
|
|
m128 d = _mm_load_si128(&vdst[i]);
|
|
m128 m = _mm_max_epu16(s, d);
|
|
_mm_store_si128(&vdst[i], m);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static VectorClock* AllocClock(VectorClock** dstp) {
|
|
if (UNLIKELY(!*dstp))
|
|
*dstp = New<VectorClock>();
|
|
return *dstp;
|
|
}
|
|
|
|
void VectorClock::Release(VectorClock** dstp) const {
|
|
VectorClock* dst = AllocClock(dstp);
|
|
dst->Acquire(this);
|
|
}
|
|
|
|
void VectorClock::ReleaseStore(VectorClock** dstp) const {
|
|
VectorClock* dst = AllocClock(dstp);
|
|
*dst = *this;
|
|
}
|
|
|
|
VectorClock& VectorClock::operator=(const VectorClock& other) {
|
|
#if !TSAN_VECTORIZE
|
|
for (uptr i = 0; i < kThreadSlotCount; i++)
|
|
clk_[i] = other.clk_[i];
|
|
#else
|
|
m128* __restrict vdst = reinterpret_cast<m128*>(clk_);
|
|
m128 const* __restrict vsrc = reinterpret_cast<m128 const*>(other.clk_);
|
|
for (uptr i = 0; i < kVectorClockSize; i++) {
|
|
m128 s = _mm_load_si128(&vsrc[i]);
|
|
_mm_store_si128(&vdst[i], s);
|
|
}
|
|
#endif
|
|
return *this;
|
|
}
|
|
|
|
void VectorClock::ReleaseStoreAcquire(VectorClock** dstp) {
|
|
VectorClock* dst = AllocClock(dstp);
|
|
#if !TSAN_VECTORIZE
|
|
for (uptr i = 0; i < kThreadSlotCount; i++) {
|
|
Epoch tmp = dst->clk_[i];
|
|
dst->clk_[i] = clk_[i];
|
|
clk_[i] = max(clk_[i], tmp);
|
|
}
|
|
#else
|
|
m128* __restrict vdst = reinterpret_cast<m128*>(dst->clk_);
|
|
m128* __restrict vclk = reinterpret_cast<m128*>(clk_);
|
|
for (uptr i = 0; i < kVectorClockSize; i++) {
|
|
m128 t = _mm_load_si128(&vdst[i]);
|
|
m128 c = _mm_load_si128(&vclk[i]);
|
|
m128 m = _mm_max_epu16(c, t);
|
|
_mm_store_si128(&vdst[i], c);
|
|
_mm_store_si128(&vclk[i], m);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void VectorClock::ReleaseAcquire(VectorClock** dstp) {
|
|
VectorClock* dst = AllocClock(dstp);
|
|
#if !TSAN_VECTORIZE
|
|
for (uptr i = 0; i < kThreadSlotCount; i++) {
|
|
dst->clk_[i] = max(dst->clk_[i], clk_[i]);
|
|
clk_[i] = dst->clk_[i];
|
|
}
|
|
#else
|
|
m128* __restrict vdst = reinterpret_cast<m128*>(dst->clk_);
|
|
m128* __restrict vclk = reinterpret_cast<m128*>(clk_);
|
|
for (uptr i = 0; i < kVectorClockSize; i++) {
|
|
m128 c = _mm_load_si128(&vclk[i]);
|
|
m128 d = _mm_load_si128(&vdst[i]);
|
|
m128 m = _mm_max_epu16(c, d);
|
|
_mm_store_si128(&vdst[i], m);
|
|
_mm_store_si128(&vclk[i], m);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
} // namespace __tsan
|