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a5dcccfdd2
I made a request on the Xbyak issue tracker to allow some constructors to be constexpr in order to avoid static constructors from needing to execute for some of our register constants. This request was implemented, so this updates Xbyak so that we can make use of it.
229 lines
6.4 KiB
C++
229 lines
6.4 KiB
C++
// Copyright 2016 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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#pragma once
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#include <bitset>
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#include <initializer_list>
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#include <xbyak.h>
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#include "common/assert.h"
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namespace Common::X64 {
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constexpr std::size_t RegToIndex(const Xbyak::Reg& reg) {
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using Kind = Xbyak::Reg::Kind;
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ASSERT_MSG((reg.getKind() & (Kind::REG | Kind::XMM)) != 0,
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"RegSet only support GPRs and XMM registers.");
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ASSERT_MSG(reg.getIdx() < 16, "RegSet only supports XXM0-15.");
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return reg.getIdx() + (reg.getKind() == Kind::REG ? 0 : 16);
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}
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constexpr Xbyak::Reg64 IndexToReg64(std::size_t reg_index) {
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ASSERT(reg_index < 16);
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return Xbyak::Reg64(static_cast<int>(reg_index));
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}
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constexpr Xbyak::Xmm IndexToXmm(std::size_t reg_index) {
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ASSERT(reg_index >= 16 && reg_index < 32);
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return Xbyak::Xmm(static_cast<int>(reg_index - 16));
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}
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constexpr Xbyak::Reg IndexToReg(std::size_t reg_index) {
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if (reg_index < 16) {
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return IndexToReg64(reg_index);
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} else {
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return IndexToXmm(reg_index);
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}
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}
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inline std::bitset<32> BuildRegSet(std::initializer_list<Xbyak::Reg> regs) {
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std::bitset<32> bits;
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for (const Xbyak::Reg& reg : regs) {
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bits[RegToIndex(reg)] = true;
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}
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return bits;
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}
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constexpr inline std::bitset<32> ABI_ALL_GPRS(0x0000FFFF);
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constexpr inline std::bitset<32> ABI_ALL_XMMS(0xFFFF0000);
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#ifdef _WIN32
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// Microsoft x64 ABI
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constexpr inline Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
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constexpr inline Xbyak::Reg ABI_PARAM1 = Xbyak::util::rcx;
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constexpr inline Xbyak::Reg ABI_PARAM2 = Xbyak::util::rdx;
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constexpr inline Xbyak::Reg ABI_PARAM3 = Xbyak::util::r8;
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constexpr inline Xbyak::Reg ABI_PARAM4 = Xbyak::util::r9;
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const std::bitset<32> ABI_ALL_CALLER_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rcx,
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Xbyak::util::rdx,
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Xbyak::util::r8,
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Xbyak::util::r9,
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Xbyak::util::r10,
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Xbyak::util::r11,
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// XMMs
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Xbyak::util::xmm0,
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Xbyak::util::xmm1,
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Xbyak::util::xmm2,
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Xbyak::util::xmm3,
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Xbyak::util::xmm4,
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Xbyak::util::xmm5,
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});
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const std::bitset<32> ABI_ALL_CALLEE_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rbx,
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Xbyak::util::rsi,
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Xbyak::util::rdi,
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Xbyak::util::rbp,
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Xbyak::util::r12,
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Xbyak::util::r13,
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Xbyak::util::r14,
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Xbyak::util::r15,
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// XMMs
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Xbyak::util::xmm6,
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Xbyak::util::xmm7,
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Xbyak::util::xmm8,
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Xbyak::util::xmm9,
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Xbyak::util::xmm10,
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Xbyak::util::xmm11,
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Xbyak::util::xmm12,
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Xbyak::util::xmm13,
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Xbyak::util::xmm14,
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Xbyak::util::xmm15,
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});
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constexpr size_t ABI_SHADOW_SPACE = 0x20;
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#else
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// System V x86-64 ABI
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constexpr inline Xbyak::Reg ABI_RETURN = Xbyak::util::rax;
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constexpr inline Xbyak::Reg ABI_PARAM1 = Xbyak::util::rdi;
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constexpr inline Xbyak::Reg ABI_PARAM2 = Xbyak::util::rsi;
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constexpr inline Xbyak::Reg ABI_PARAM3 = Xbyak::util::rdx;
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constexpr inline Xbyak::Reg ABI_PARAM4 = Xbyak::util::rcx;
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const std::bitset<32> ABI_ALL_CALLER_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rcx,
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Xbyak::util::rdx,
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Xbyak::util::rdi,
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Xbyak::util::rsi,
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Xbyak::util::r8,
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Xbyak::util::r9,
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Xbyak::util::r10,
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Xbyak::util::r11,
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// XMMs
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Xbyak::util::xmm0,
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Xbyak::util::xmm1,
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Xbyak::util::xmm2,
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Xbyak::util::xmm3,
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Xbyak::util::xmm4,
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Xbyak::util::xmm5,
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Xbyak::util::xmm6,
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Xbyak::util::xmm7,
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Xbyak::util::xmm8,
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Xbyak::util::xmm9,
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Xbyak::util::xmm10,
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Xbyak::util::xmm11,
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Xbyak::util::xmm12,
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Xbyak::util::xmm13,
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Xbyak::util::xmm14,
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Xbyak::util::xmm15,
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});
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const std::bitset<32> ABI_ALL_CALLEE_SAVED = BuildRegSet({
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// GPRs
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Xbyak::util::rbx,
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Xbyak::util::rbp,
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Xbyak::util::r12,
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Xbyak::util::r13,
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Xbyak::util::r14,
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Xbyak::util::r15,
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});
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constexpr size_t ABI_SHADOW_SPACE = 0;
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#endif
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struct ABIFrameInfo {
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s32 subtraction;
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s32 xmm_offset;
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};
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inline ABIFrameInfo ABI_CalculateFrameSize(std::bitset<32> regs, size_t rsp_alignment,
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size_t needed_frame_size) {
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const auto count = (regs & ABI_ALL_GPRS).count();
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rsp_alignment -= count * 8;
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size_t subtraction = 0;
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const auto xmm_count = (regs & ABI_ALL_XMMS).count();
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if (xmm_count) {
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// If we have any XMMs to save, we must align the stack here.
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subtraction = rsp_alignment & 0xF;
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}
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subtraction += 0x10 * xmm_count;
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size_t xmm_base_subtraction = subtraction;
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subtraction += needed_frame_size;
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subtraction += ABI_SHADOW_SPACE;
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// Final alignment.
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rsp_alignment -= subtraction;
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subtraction += rsp_alignment & 0xF;
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return ABIFrameInfo{static_cast<s32>(subtraction),
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static_cast<s32>(subtraction - xmm_base_subtraction)};
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}
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inline size_t ABI_PushRegistersAndAdjustStack(Xbyak::CodeGenerator& code, std::bitset<32> regs,
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size_t rsp_alignment, size_t needed_frame_size = 0) {
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auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
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for (std::size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_GPRS[i]) {
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code.push(IndexToReg64(i));
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}
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}
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if (frame_info.subtraction != 0) {
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code.sub(code.rsp, frame_info.subtraction);
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}
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for (std::size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_XMMS[i]) {
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code.movaps(code.xword[code.rsp + frame_info.xmm_offset], IndexToXmm(i));
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frame_info.xmm_offset += 0x10;
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}
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}
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return ABI_SHADOW_SPACE;
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}
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inline void ABI_PopRegistersAndAdjustStack(Xbyak::CodeGenerator& code, std::bitset<32> regs,
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size_t rsp_alignment, size_t needed_frame_size = 0) {
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auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
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for (std::size_t i = 0; i < regs.size(); ++i) {
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if (regs[i] && ABI_ALL_XMMS[i]) {
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code.movaps(IndexToXmm(i), code.xword[code.rsp + frame_info.xmm_offset]);
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frame_info.xmm_offset += 0x10;
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}
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}
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if (frame_info.subtraction != 0) {
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code.add(code.rsp, frame_info.subtraction);
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}
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// GPRs need to be popped in reverse order
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for (std::size_t j = 0; j < regs.size(); ++j) {
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const std::size_t i = regs.size() - j - 1;
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if (regs[i] && ABI_ALL_GPRS[i]) {
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code.pop(IndexToReg64(i));
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}
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}
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}
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} // namespace Common::X64
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