head	1.1;
branch	1.1.1;
access;
symbols
	netbsd-11-0-RC4:1.1.1.1
	netbsd-11-0-RC3:1.1.1.1
	netbsd-11-0-RC2:1.1.1.1
	netbsd-11-0-RC1:1.1.1.1
	gcc-14-3-0:1.1.1.1
	perseant-exfatfs-base-20250801:1.1.1.1
	netbsd-11:1.1.1.1.0.4
	netbsd-11-base:1.1.1.1
	gcc-12-5-0:1.1.1.1
	perseant-exfatfs-base-20240630:1.1.1.1
	gcc-12-4-0:1.1.1.1
	perseant-exfatfs:1.1.1.1.0.2
	perseant-exfatfs-base:1.1.1.1
	gcc-12-3-0:1.1.1.1
	FSF:1.1.1;
locks; strict;
comment	@// @;


1.1
date	2023.07.30.05.20.41;	author mrg;	state Exp;
branches
	1.1.1.1;
next	;
commitid	tk6nV4mbc9nVEMyE;

1.1.1.1
date	2023.07.30.05.20.41;	author mrg;	state Exp;
branches;
next	;
commitid	tk6nV4mbc9nVEMyE;


desc
@@


1.1
log
@Initial revision
@
text
@//===-- 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
@


1.1.1.1
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@@