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Merge pull request #5356 from lioncash/clz
common/bit_util: Replace CLZ/CTZ operations with standardized ones
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commit
5b9aedfc21
@ -21,82 +21,6 @@ template <typename T>
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return sizeof(T) * CHAR_BIT;
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}
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#ifdef _MSC_VER
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[[nodiscard]] inline u32 CountLeadingZeroes32(u32 value) {
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unsigned long leading_zero = 0;
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if (_BitScanReverse(&leading_zero, value) != 0) {
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return 31 - leading_zero;
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}
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return 32;
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}
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[[nodiscard]] inline u32 CountLeadingZeroes64(u64 value) {
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unsigned long leading_zero = 0;
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if (_BitScanReverse64(&leading_zero, value) != 0) {
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return 63 - leading_zero;
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}
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return 64;
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}
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#else
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[[nodiscard]] inline u32 CountLeadingZeroes32(u32 value) {
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if (value == 0) {
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return 32;
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}
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return static_cast<u32>(__builtin_clz(value));
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}
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[[nodiscard]] inline u32 CountLeadingZeroes64(u64 value) {
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if (value == 0) {
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return 64;
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}
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return static_cast<u32>(__builtin_clzll(value));
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}
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#endif
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#ifdef _MSC_VER
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[[nodiscard]] inline u32 CountTrailingZeroes32(u32 value) {
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unsigned long trailing_zero = 0;
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if (_BitScanForward(&trailing_zero, value) != 0) {
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return trailing_zero;
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}
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return 32;
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}
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[[nodiscard]] inline u32 CountTrailingZeroes64(u64 value) {
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unsigned long trailing_zero = 0;
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if (_BitScanForward64(&trailing_zero, value) != 0) {
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return trailing_zero;
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}
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return 64;
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}
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#else
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[[nodiscard]] inline u32 CountTrailingZeroes32(u32 value) {
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if (value == 0) {
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return 32;
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}
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return static_cast<u32>(__builtin_ctz(value));
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}
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[[nodiscard]] inline u32 CountTrailingZeroes64(u64 value) {
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if (value == 0) {
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return 64;
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}
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return static_cast<u32>(__builtin_ctzll(value));
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}
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#endif
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#ifdef _MSC_VER
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[[nodiscard]] inline u32 MostSignificantBit32(const u32 value) {
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@ -8,11 +8,11 @@
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#pragma once
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#include <array>
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#include <bit>
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#include <concepts>
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#include "common/assert.h"
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#include "common/bit_set.h"
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#include "common/bit_util.h"
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#include "common/common_types.h"
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#include "common/concepts.h"
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@ -268,7 +268,7 @@ private:
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}
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constexpr s32 GetNextCore(u64& affinity) {
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const s32 core = Common::CountTrailingZeroes64(affinity);
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const s32 core = std::countr_zero(affinity);
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ClearAffinityBit(affinity, core);
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return core;
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}
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@ -5,6 +5,8 @@
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// This file references various implementation details from Atmosphere, an open-source firmware for
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// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
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#include <bit>
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#include "common/assert.h"
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#include "common/bit_util.h"
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#include "common/fiber.h"
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@ -31,12 +33,12 @@ static void IncrementScheduledCount(Kernel::Thread* thread) {
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void KScheduler::RescheduleCores(KernelCore& kernel, u64 cores_pending_reschedule,
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Core::EmuThreadHandle global_thread) {
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u32 current_core = global_thread.host_handle;
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const u32 current_core = global_thread.host_handle;
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bool must_context_switch = global_thread.guest_handle != InvalidHandle &&
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(current_core < Core::Hardware::NUM_CPU_CORES);
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while (cores_pending_reschedule != 0) {
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u32 core = Common::CountTrailingZeroes64(cores_pending_reschedule);
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const auto core = static_cast<u32>(std::countr_zero(cores_pending_reschedule));
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ASSERT(core < Core::Hardware::NUM_CPU_CORES);
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if (!must_context_switch || core != current_core) {
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auto& phys_core = kernel.PhysicalCore(core);
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@ -109,7 +111,7 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) {
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// Idle cores are bad. We're going to try to migrate threads to each idle core in turn.
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while (idle_cores != 0) {
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u32 core_id = Common::CountTrailingZeroes64(idle_cores);
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const auto core_id = static_cast<u32>(std::countr_zero(idle_cores));
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if (Thread* suggested = priority_queue.GetSuggestedFront(core_id); suggested != nullptr) {
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s32 migration_candidates[Core::Hardware::NUM_CPU_CORES];
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size_t num_candidates = 0;
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@ -8,11 +8,11 @@
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#pragma once
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#include <array>
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#include <bit>
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#include <vector>
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#include "common/alignment.h"
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#include "common/assert.h"
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#include "common/bit_util.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "core/hle/kernel/memory/memory_types.h"
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@ -105,7 +105,7 @@ private:
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ASSERT(depth == 0);
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return -1;
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}
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offset = offset * 64 + Common::CountTrailingZeroes64(v);
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offset = offset * 64 + static_cast<u32>(std::countr_zero(v));
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++depth;
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} while (depth < static_cast<s32>(used_depths));
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@ -2,6 +2,8 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <bit>
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#include "common/bit_util.h"
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#include "common/logging/log.h"
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#include "core/hle/kernel/errors.h"
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@ -60,7 +62,7 @@ constexpr CapabilityType GetCapabilityType(u32 value) {
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u32 GetFlagBitOffset(CapabilityType type) {
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const auto value = static_cast<u32>(type);
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return static_cast<u32>(Common::BitSize<u32>() - Common::CountLeadingZeroes32(value));
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return static_cast<u32>(Common::BitSize<u32>() - static_cast<u32>(std::countl_zero(value)));
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}
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} // Anonymous namespace
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@ -1,6 +1,5 @@
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add_executable(tests
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common/bit_field.cpp
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common/bit_utils.cpp
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common/fibers.cpp
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common/param_package.cpp
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common/ring_buffer.cpp
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@ -1,23 +0,0 @@
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <catch2/catch.hpp>
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#include <math.h>
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#include "common/bit_util.h"
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namespace Common {
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TEST_CASE("BitUtils::CountTrailingZeroes", "[common]") {
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REQUIRE(Common::CountTrailingZeroes32(0) == 32);
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REQUIRE(Common::CountTrailingZeroes64(0) == 64);
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REQUIRE(Common::CountTrailingZeroes32(9) == 0);
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REQUIRE(Common::CountTrailingZeroes32(8) == 3);
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REQUIRE(Common::CountTrailingZeroes32(0x801000) == 12);
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REQUIRE(Common::CountTrailingZeroes64(9) == 0);
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REQUIRE(Common::CountTrailingZeroes64(8) == 3);
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REQUIRE(Common::CountTrailingZeroes64(0x801000) == 12);
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REQUIRE(Common::CountTrailingZeroes64(0x801000000000UL) == 36);
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}
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} // namespace Common
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@ -18,10 +18,10 @@
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#include <bit>
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#include "command_classes/host1x.h"
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#include "command_classes/nvdec.h"
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#include "command_classes/vic.h"
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#include "common/bit_util.h"
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#include "video_core/cdma_pusher.h"
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#include "video_core/command_classes/nvdec_common.h"
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#include "video_core/engines/maxwell_3d.h"
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@ -56,7 +56,7 @@ void CDmaPusher::Step() {
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for (const u32 value : values) {
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if (mask != 0) {
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const u32 lbs = Common::CountTrailingZeroes32(mask);
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const auto lbs = static_cast<u32>(std::countr_zero(mask));
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mask &= ~(1U << lbs);
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ExecuteCommand(static_cast<u32>(offset + lbs), value);
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continue;
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@ -126,7 +126,7 @@ private:
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s32 count{};
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s32 offset{};
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s32 mask{};
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u32 mask{};
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bool incrementing{};
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// Queue of command lists to be processed
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@ -19,7 +19,7 @@
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//
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#include <array>
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#include "common/bit_util.h"
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#include <bit>
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#include "video_core/command_classes/codecs/h264.h"
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#include "video_core/gpu.h"
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#include "video_core/memory_manager.h"
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@ -266,7 +266,7 @@ void H264BitWriter::WriteExpGolombCodedInt(s32 value) {
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}
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void H264BitWriter::WriteExpGolombCodedUInt(u32 value) {
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const s32 size = 32 - Common::CountLeadingZeroes32(static_cast<s32>(value + 1));
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const s32 size = 32 - std::countl_zero(value + 1);
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WriteBits(1, size);
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value -= (1U << (size - 1)) - 1;
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