mirror of
https://github.com/RPCSX/rpcsx.git
synced 2025-12-06 07:12:14 +01:00
b42fae0989
Fix utils::rol32/64 functions. Fix immediate clamping in splat instructions. Other fixes.
424 lines
8.5 KiB
C++
424 lines
8.5 KiB
C++
#pragma once
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#include "util/types.hpp"
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#include "util/tsc.hpp"
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#include <functional>
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extern bool g_use_rtm;
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extern u64 g_rtm_tx_limit1;
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#ifdef _M_X64
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extern "C"
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{
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u32 _xbegin();
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void _xend();
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void _mm_pause();
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void _mm_prefetch(const char*, int);
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void _m_prefetchw(const volatile void*);
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uchar _rotl8(uchar, uchar);
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ushort _rotl16(ushort, uchar);
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uint _rotl(uint, int);
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u64 _rotl64(u64, int);
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u64 __popcnt64(u64);
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s64 __mulh(s64, s64);
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u64 __umulh(u64, u64);
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s64 _div128(s64, s64, s64, s64*);
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u64 _udiv128(u64, u64, u64, u64*);
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void __debugbreak();
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}
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#endif
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namespace utils
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{
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// Transaction helper (result = pair of success and op result, or just bool)
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template <typename F, typename R = std::invoke_result_t<F>>
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inline auto tx_start(F op)
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{
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#if defined(ARCH_X64)
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uint status = -1;
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for (auto stamp0 = get_tsc(), stamp1 = stamp0; g_use_rtm && stamp1 - stamp0 <= g_rtm_tx_limit1; stamp1 = get_tsc())
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{
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#ifndef _MSC_VER
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__asm__ goto ("xbegin %l[retry];" ::: "memory" : retry);
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#else
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status = _xbegin();
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if (status != umax) [[unlikely]]
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{
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goto retry;
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}
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#endif
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if constexpr (std::is_void_v<R>)
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{
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std::invoke(op);
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#ifndef _MSC_VER
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__asm__ volatile ("xend;" ::: "memory");
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#else
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_xend();
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#endif
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return true;
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}
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else
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{
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auto result = std::invoke(op);
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#ifndef _MSC_VER
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__asm__ volatile ("xend;" ::: "memory");
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#else
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_xend();
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#endif
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return std::make_pair(true, std::move(result));
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}
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retry:
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#ifndef _MSC_VER
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__asm__ volatile ("movl %%eax, %0;" : "=r" (status) :: "memory");
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#endif
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if (!status) [[unlikely]]
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{
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break;
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}
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}
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#else
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static_cast<void>(op);
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#endif
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if constexpr (std::is_void_v<R>)
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{
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return false;
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}
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else
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{
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return std::make_pair(false, R());
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}
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};
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// Try to prefetch to Level 2 cache since it's not split to data/code on most processors
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template <typename T>
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constexpr void prefetch_exec(T func)
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{
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if (std::is_constant_evaluated())
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{
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return;
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}
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const u64 value = reinterpret_cast<u64>(func);
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const void* ptr = reinterpret_cast<const void*>(value);
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#ifdef _M_X64
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return _mm_prefetch(static_cast<const char*>(ptr), 2);
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#else
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return __builtin_prefetch(ptr, 0, 2);
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#endif
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}
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// Try to prefetch to Level 1 cache
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constexpr void prefetch_read(const void* ptr)
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{
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if (std::is_constant_evaluated())
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{
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return;
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}
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#ifdef _M_X64
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return _mm_prefetch(static_cast<const char*>(ptr), 3);
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#else
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return __builtin_prefetch(ptr, 0, 3);
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#endif
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}
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constexpr void prefetch_write(void* ptr)
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{
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if (std::is_constant_evaluated())
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{
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return;
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}
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#ifdef _M_X64
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return _m_prefetchw(ptr);
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#else
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return __builtin_prefetch(ptr, 1, 0);
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#endif
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}
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constexpr u8 rol8(u8 x, u8 n)
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{
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if (std::is_constant_evaluated())
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{
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return (x << (n & 7)) | (x >> ((-n & 7)));
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}
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#ifdef _MSC_VER
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return _rotl8(x, n);
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#elif defined(__clang__)
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return __builtin_rotateleft8(x, n);
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#elif defined(ARCH_X64)
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return __builtin_ia32_rolqi(x, n);
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#else
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return (x << (n & 7)) | (x >> ((-n & 7)));
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#endif
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}
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constexpr u16 rol16(u16 x, u16 n)
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{
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if (std::is_constant_evaluated())
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{
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return (x << (n & 15)) | (x >> ((-n & 15)));
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}
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#ifdef _MSC_VER
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return _rotl16(x, static_cast<uchar>(n));
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#elif defined(__clang__)
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return __builtin_rotateleft16(x, n);
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#elif defined(ARCH_X64)
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return __builtin_ia32_rolhi(x, n);
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#else
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return (x << (n & 15)) | (x >> ((-n & 15)));
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#endif
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}
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constexpr u32 rol32(u32 x, u32 n)
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{
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if (std::is_constant_evaluated())
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{
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return (x << (n & 31)) | (x >> (((0 - n) & 31)));
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}
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#ifdef _MSC_VER
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return _rotl(x, n);
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#elif defined(__clang__)
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return __builtin_rotateleft32(x, n);
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#else
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return (x << (n & 31)) | (x >> (((0 - n) & 31)));
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#endif
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}
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constexpr u64 rol64(u64 x, u64 n)
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{
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if (std::is_constant_evaluated())
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{
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return (x << (n & 63)) | (x >> (((0 - n) & 63)));
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}
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#ifdef _MSC_VER
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return _rotl64(x, static_cast<int>(n));
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#elif defined(__clang__)
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return __builtin_rotateleft64(x, n);
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#else
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return (x << (n & 63)) | (x >> (((0 - n) & 63)));
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#endif
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}
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constexpr u32 popcnt64(u64 v)
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{
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#if !defined(_MSC_VER) || defined(__SSE4_2__)
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if (std::is_constant_evaluated())
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#endif
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{
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v = (v & 0xaaaaaaaaaaaaaaaa) / 2 + (v & 0x5555555555555555);
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v = (v & 0xcccccccccccccccc) / 4 + (v & 0x3333333333333333);
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v = (v & 0xf0f0f0f0f0f0f0f0) / 16 + (v & 0x0f0f0f0f0f0f0f0f);
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v = (v & 0xff00ff00ff00ff00) / 256 + (v & 0x00ff00ff00ff00ff);
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v = ((v & 0xffff0000ffff0000) >> 16) + (v & 0x0000ffff0000ffff);
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return static_cast<u32>((v >> 32) + v);
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}
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#if !defined(_MSC_VER) || defined(__SSE4_2__)
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#ifdef _MSC_VER
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return static_cast<u32>(__popcnt64(v));
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#else
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return __builtin_popcountll(v);
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#endif
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#endif
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}
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constexpr u32 popcnt128(const u128& v)
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{
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#ifdef _MSC_VER
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return popcnt64(v.lo) + popcnt64(v.hi);
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#else
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return popcnt64(v) + popcnt64(v >> 64);
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#endif
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}
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constexpr u64 umulh64(u64 x, u64 y)
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{
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#ifdef _MSC_VER
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if (std::is_constant_evaluated())
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#endif
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{
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return static_cast<u64>((u128{x} * u128{y}) >> 64);
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}
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#ifdef _MSC_VER
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return __umulh(x, y);
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#endif
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}
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inline s64 mulh64(s64 x, s64 y)
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{
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#ifdef _MSC_VER
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return __mulh(x, y);
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#else
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return (s128{x} * s128{y}) >> 64;
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#endif
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}
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inline s64 div128(s64 high, s64 low, s64 divisor, s64* remainder = nullptr)
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{
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#ifdef _MSC_VER
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s64 rem = 0;
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s64 r = _div128(high, low, divisor, &rem);
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if (remainder)
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{
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*remainder = rem;
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}
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#else
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const s128 x = (u128{static_cast<u64>(high)} << 64) | u64(low);
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const s128 r = x / divisor;
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if (remainder)
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{
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*remainder = x % divisor;
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}
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#endif
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return r;
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}
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inline u64 udiv128(u64 high, u64 low, u64 divisor, u64* remainder = nullptr)
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{
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#ifdef _MSC_VER
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u64 rem = 0;
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u64 r = _udiv128(high, low, divisor, &rem);
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if (remainder)
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{
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*remainder = rem;
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}
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#else
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const u128 x = (u128{high} << 64) | low;
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const u128 r = x / divisor;
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if (remainder)
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{
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*remainder = x % divisor;
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}
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#endif
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return r;
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}
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constexpr u32 ctz128(u128 arg)
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{
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#ifdef _MSC_VER
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if (!arg.lo)
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return std::countr_zero(arg.hi) + 64u;
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else
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return std::countr_zero(arg.lo);
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#else
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if (u64 lo = static_cast<u64>(arg))
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return std::countr_zero<u64>(lo);
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else
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return std::countr_zero<u64>(arg >> 64) + 64;
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#endif
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}
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constexpr u32 clz128(u128 arg)
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{
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#ifdef _MSC_VER
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if (arg.hi)
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return std::countl_zero(arg.hi);
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else
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return std::countl_zero(arg.lo) + 64;
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#else
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if (u64 hi = static_cast<u64>(arg >> 64))
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return std::countl_zero<u64>(hi);
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else
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return std::countl_zero<u64>(arg) + 64;
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#endif
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}
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inline void pause()
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{
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#if defined(ARCH_ARM64)
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__asm__ volatile("yield");
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#elif defined(_M_X64)
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_mm_pause();
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#elif defined(ARCH_X64)
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__builtin_ia32_pause();
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#else
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#error "Missing utils::pause() implementation"
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#endif
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}
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// Synchronization helper (cache-friendly busy waiting)
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inline void busy_wait(usz cycles = 3000)
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{
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const u64 start = get_tsc();
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do pause();
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while (get_tsc() - start < cycles);
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}
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// Align to power of 2
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template <typename T, typename = std::enable_if_t<std::is_unsigned_v<T>>>
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constexpr T align(T value, std::type_identity_t<T> align)
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{
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return static_cast<T>((value + (align - 1)) & (T{0} - align));
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}
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// General purpose aligned division, the result is rounded up not truncated
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template <typename T, typename = std::enable_if_t<std::is_unsigned_v<T>>>
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constexpr T aligned_div(T value, std::type_identity_t<T> align)
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{
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return static_cast<T>(value / align + T{!!(value % align)});
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}
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// General purpose aligned division, the result is rounded to nearest
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template <typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
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constexpr T rounded_div(T value, std::type_identity_t<T> align)
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{
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if constexpr (std::is_unsigned_v<T>)
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{
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return static_cast<T>(value / align + T{(value % align) > (align / 2)});
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}
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return static_cast<T>(value / align + (value > 0 ? T{(value % align) > (align / 2)} : 0 - T{(value % align) < (align / 2)}));
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}
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// Hack. Pointer cast util to workaround UB. Use with extreme care.
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template <typename T, typename U>
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[[nodiscard]] T* bless(U* ptr)
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{
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#ifdef _MSC_VER
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return (T*)ptr;
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#elif defined(ARCH_X64)
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T* result;
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__asm__("movq %1, %0;" : "=r" (result) : "r" (ptr) : "memory");
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return result;
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#elif defined(ARCH_ARM64)
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T* result;
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__asm__("mov %0, %1" : "=r" (result) : "r" (ptr) : "memory");
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return result;
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#endif
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}
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inline void trap()
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{
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#ifdef _M_X64
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__debugbreak();
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#elif defined(ARCH_X64)
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__asm__ volatile("int3");
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#elif defined(ARCH_ARM64)
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__asm__ volatile("brk 0x42");
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#else
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#error "Missing utils::trap() implementation"
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#endif
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}
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} // namespace utils
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using utils::busy_wait;
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