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https://github.com/yuzu-emu/yuzu-android
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Implement intrinsics CountTrailingZeroes and test it.
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@ -59,22 +59,43 @@ inline u64 CountLeadingZeroes64(u64 value) {
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}
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#endif
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#ifdef _MSC_VER
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inline u32 CountTrailingZeroes32(u32 value) {
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u32 count = 0;
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while (((value >> count) & 0xf) == 0 && count < 32)
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count += 4;
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while (((value >> count) & 1) == 0 && count < 32)
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count++;
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return count;
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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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inline u64 CountTrailingZeroes64(u64 value) {
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u64 count = 0;
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while (((value >> count) & 0xf) == 0 && count < 64)
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count += 4;
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while (((value >> count) & 1) == 0 && count < 64)
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count++;
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return count;
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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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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 __builtin_ctz(value);
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}
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inline u64 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 __builtin_ctzll(value);
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}
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#endif
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} // namespace Common
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@ -1,5 +1,6 @@
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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/param_package.cpp
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common/ring_buffer.cpp
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core/arm/arm_test_common.cpp
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42
src/tests/common/bit_utils.cpp
Normal file
42
src/tests/common/bit_utils.cpp
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@ -0,0 +1,42 @@
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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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inline u32 CTZ32(u32 value) {
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u32 count = 0;
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while (((value >> count) & 0xf) == 0 && count < 32)
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count += 4;
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while (((value >> count) & 1) == 0 && count < 32)
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count++;
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return count;
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}
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inline u64 CTZ64(u64 value) {
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u64 count = 0;
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while (((value >> count) & 0xf) == 0 && count < 64)
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count += 4;
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while (((value >> count) & 1) == 0 && count < 64)
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count++;
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return count;
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}
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TEST_CASE("BitUtils", "[common]") {
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REQUIRE(Common::CountTrailingZeroes32(0) == CTZ32(0));
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REQUIRE(Common::CountTrailingZeroes64(0) == CTZ64(0));
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REQUIRE(Common::CountTrailingZeroes32(9) == CTZ32(9));
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REQUIRE(Common::CountTrailingZeroes32(8) == CTZ32(8));
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REQUIRE(Common::CountTrailingZeroes32(0x801000) == CTZ32(0x801000));
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REQUIRE(Common::CountTrailingZeroes64(9) == CTZ64(9));
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REQUIRE(Common::CountTrailingZeroes64(8) == CTZ64(8));
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REQUIRE(Common::CountTrailingZeroes64(0x801000) == CTZ64(0x801000));
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REQUIRE(Common::CountTrailingZeroes64(0x801000000000UL) == CTZ64(0x801000000000UL));
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}
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} // namespace Common
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