152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2021 MerryMage
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* SPDX-License-Identifier: 0BSD
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*/
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#include <catch2/benchmark/catch_benchmark.hpp>
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#include <catch2/catch_test_macros.hpp>
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#include <fmt/printf.h>
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#include <mcl/stdint.hpp>
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#include "dynarmic/common/fp/fpcr.h"
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#include "dynarmic/common/fp/fpsr.h"
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#include "dynarmic/common/fp/op/FPRSqrtEstimate.h"
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extern "C" u32 rsqrt_inaccurate(u32);
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extern "C" u32 rsqrt_full(u32);
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extern "C" u32 rsqrt_full_gpr(u32);
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extern "C" u32 rsqrt_full_nb(u32);
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extern "C" u32 rsqrt_full_nb2(u32);
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extern "C" u32 rsqrt_full_nb_gpr(u32);
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extern "C" u32 rsqrt_newton(u32);
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extern "C" u32 rsqrt_hack(u32);
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using namespace Dynarmic;
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extern "C" u32 rsqrt_fallback(u32 value) {
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FP::FPCR fpcr;
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FP::FPSR fpsr;
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return FP::FPRSqrtEstimate(value, fpcr, fpsr);
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}
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extern "C" u32 _rsqrt_fallback(u32 value) {
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return rsqrt_fallback(value);
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}
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void Test(u32 value) {
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FP::FPCR fpcr;
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FP::FPSR fpsr;
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const u32 expect = FP::FPRSqrtEstimate(value, fpcr, fpsr);
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const u32 full = rsqrt_full(value);
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const u32 full_gpr = rsqrt_full_gpr(value);
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const u32 newton = rsqrt_newton(value);
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const u32 hack = rsqrt_hack(value);
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if (expect != full || expect != full_gpr || expect != newton || expect != hack) {
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fmt::print("{:08x} = {:08x} : {:08x} : {:08x} : {:08x} : {:08x}\n", value, expect, full, full_gpr, newton, hack);
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REQUIRE(expect == full);
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REQUIRE(expect == full_gpr);
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REQUIRE(expect == newton);
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REQUIRE(expect == hack);
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}
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}
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TEST_CASE("RSqrt Tests", "[fp][.]") {
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Test(0x00000000);
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Test(0x80000000);
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Test(0x7f8b7201);
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Test(0x7f800000);
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Test(0x7fc00000);
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Test(0xff800000);
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Test(0xffc00000);
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Test(0xff800001);
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for (u64 i = 0; i < 0x1'0000'0000; i++) {
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const u32 value = static_cast<u32>(i);
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Test(value);
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}
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}
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TEST_CASE("Benchmark RSqrt", "[fp][.]") {
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BENCHMARK("Inaccurate") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_inaccurate(value);
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}
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return total;
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};
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BENCHMARK("Full divss") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_full(value);
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}
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return total;
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};
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BENCHMARK("Full divss (GPR)") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_full_gpr(value);
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}
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return total;
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};
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BENCHMARK("Full divss (NB)") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_full_nb(value);
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}
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return total;
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};
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BENCHMARK("Full divss (NB2)") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_full_nb2(value);
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}
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return total;
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};
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BENCHMARK("Full divss (NB + GPR)") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_full_nb_gpr(value);
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}
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return total;
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};
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BENCHMARK("One Newton iteration") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_newton(value);
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}
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return total;
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};
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BENCHMARK("Ugly Hack") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_hack(value);
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}
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return total;
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};
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BENCHMARK("Softfloat") {
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u64 total = 0;
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for (u64 i = 0; i < 0x1'0000'0000; i += 0x1234) {
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const u32 value = static_cast<u32>(i);
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total += rsqrt_fallback(value);
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}
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return total;
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};
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}
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