// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <smmintrin.h>
#include "common/x64/abi.h"
#include "common/x64/cpu_detect.h"
#include "common/x64/emitter.h"
#include "shader.h"
#include "shader_jit_x64.h"
namespace Pica {
namespace Shader {
using namespace Gen;
typedef void (JitCompiler::*JitFunction)(Instruction instr);
const JitFunction instr_table[64] = {
&JitCompiler::Compile_ADD, // add
&JitCompiler::Compile_DP3, // dp3
&JitCompiler::Compile_DP4, // dp4
nullptr, // dph
nullptr, // unknown
&JitCompiler::Compile_EX2, // ex2
&JitCompiler::Compile_LG2, // lg2
nullptr, // unknown
&JitCompiler::Compile_MUL, // mul
&JitCompiler::Compile_SGE, // sge
&JitCompiler::Compile_SLT, // slt
&JitCompiler::Compile_FLR, // flr
&JitCompiler::Compile_MAX, // max
&JitCompiler::Compile_MIN, // min
&JitCompiler::Compile_RCP, // rcp
&JitCompiler::Compile_RSQ, // rsq
nullptr, // unknown
nullptr, // unknown
&JitCompiler::Compile_MOVA, // mova
&JitCompiler::Compile_MOV, // mov
nullptr, // unknown
nullptr, // unknown
nullptr, // unknown
nullptr, // unknown
nullptr, // dphi
nullptr, // unknown
&JitCompiler::Compile_SGE, // sgei
&JitCompiler::Compile_SLT, // slti
nullptr, // unknown
nullptr, // unknown
nullptr, // unknown
nullptr, // unknown
nullptr, // unknown
&JitCompiler::Compile_NOP, // nop
&JitCompiler::Compile_END, // end
nullptr, // break
&JitCompiler::Compile_CALL, // call
&JitCompiler::Compile_CALLC, // callc
&JitCompiler::Compile_CALLU, // callu
&JitCompiler::Compile_IF, // ifu
&JitCompiler::Compile_IF, // ifc
&JitCompiler::Compile_LOOP, // loop
nullptr, // emit
nullptr, // sete
&JitCompiler::Compile_JMP, // jmpc
&JitCompiler::Compile_JMP, // jmpu
&JitCompiler::Compile_CMP, // cmp
&JitCompiler::Compile_CMP, // cmp
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // madi
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
&JitCompiler::Compile_MAD, // mad
};
// The following is used to alias some commonly used registers. Generally, RAX-RDX and XMM0-XMM3 can
// be used as scratch registers within a compiler function. The other registers have designated
// purposes, as documented below:
/// Pointer to the uniform memory
static const X64Reg UNIFORMS = R9;
/// The two 32-bit VS address offset registers set by the MOVA instruction
static const X64Reg ADDROFFS_REG_0 = R10;
static const X64Reg ADDROFFS_REG_1 = R11;
/// VS loop count register
static const X64Reg LOOPCOUNT_REG = R12;
/// Current VS loop iteration number (we could probably use LOOPCOUNT_REG, but this quicker)
static const X64Reg LOOPCOUNT = RSI;
/// Number to increment LOOPCOUNT_REG by on each loop iteration
static const X64Reg LOOPINC = RDI;
/// Result of the previous CMP instruction for the X-component comparison
static const X64Reg COND0 = R13;
/// Result of the previous CMP instruction for the Y-component comparison
static const X64Reg COND1 = R14;
/// Pointer to the UnitState instance for the current VS unit
static const X64Reg REGISTERS = R15;
/// SIMD scratch register
static const X64Reg SCRATCH = XMM0;
/// Loaded with the first swizzled source register, otherwise can be used as a scratch register
static const X64Reg SRC1 = XMM1;
/// Loaded with the second swizzled source register, otherwise can be used as a scratch register
static const X64Reg SRC2 = XMM2;
/// Loaded with the third swizzled source register, otherwise can be used as a scratch register
static const X64Reg SRC3 = XMM3;
/// Constant vector of [1.0f, 1.0f, 1.0f, 1.0f], used to efficiently set a vector to one
static const X64Reg ONE = XMM14;
/// Constant vector of [-0.f, -0.f, -0.f, -0.f], used to efficiently negate a vector with XOR
static const X64Reg NEGBIT = XMM15;
/// Raw constant for the source register selector that indicates no swizzling is performed
static const u8 NO_SRC_REG_SWIZZLE = 0x1b;
/// Raw constant for the destination register enable mask that indicates all components are enabled
static const u8 NO_DEST_REG_MASK = 0xf;
/**
* Loads and swizzles a source register into the specified XMM register.
* @param instr VS instruction, used for determining how to load the source register
* @param src_num Number indicating which source register to load (1 = src1, 2 = src2, 3 = src3)
* @param src_reg SourceRegister object corresponding to the source register to load
* @param dest Destination XMM register to store the loaded, swizzled source register
*/
void JitCompiler::Compile_SwizzleSrc(Instruction instr, unsigned src_num, SourceRegister src_reg, X64Reg dest) {
X64Reg src_ptr;
int src_offset;
if (src_reg.GetRegisterType() == RegisterType::FloatUniform) {
src_ptr = UNIFORMS;
src_offset = src_reg.GetIndex() * sizeof(float24) * 4;
} else {
src_ptr = REGISTERS;
src_offset = UnitState<false>::InputOffset(src_reg);
}
unsigned operand_desc_id;
if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MAD ||
instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI) {
// The MAD and MADI instructions do not use the address offset registers, so loading the
// source is a bit simpler here
operand_desc_id = instr.mad.operand_desc_id;
// Load the source
MOVAPS(dest, MDisp(src_ptr, src_offset));
} else {
operand_desc_id = instr.common.operand_desc_id;
const bool is_inverted = (0 != (instr.opcode.Value().GetInfo().subtype & OpCode::Info::SrcInversed));
unsigned offset_src = is_inverted ? 2 : 1;
if (src_num == offset_src && instr.common.address_register_index != 0) {
switch (instr.common.address_register_index) {
case 1: // address offset 1
MOVAPS(dest, MComplex(src_ptr, ADDROFFS_REG_0, 1, src_offset));
break;
case 2: // address offset 2
MOVAPS(dest, MComplex(src_ptr, ADDROFFS_REG_1, 1, src_offset));
break;
case 3: // adddress offet 3
MOVAPS(dest, MComplex(src_ptr, LOOPCOUNT_REG, 1, src_offset));
break;
default:
UNREACHABLE();
break;
}
} else {
// Load the source
MOVAPS(dest, MDisp(src_ptr, src_offset));
}
}
SwizzlePattern swiz = { g_state.vs.swizzle_data[operand_desc_id] };
// Generate instructions for source register swizzling as needed
u8 sel = swiz.GetRawSelector(src_num);
if (sel != NO_SRC_REG_SWIZZLE) {
// Selector component order needs to be reversed for the SHUFPS instruction
sel = ((sel & 0xc0) >> 6) | ((sel & 3) << 6) | ((sel & 0xc) << 2) | ((sel & 0x30) >> 2);
// Shuffle inputs for swizzle
SHUFPS(dest, R(dest), sel);
}
// If the source register should be negated, flip the negative bit using XOR
const bool negate[] = { swiz.negate_src1, swiz.negate_src2, swiz.negate_src3 };
if (negate[src_num - 1]) {
XORPS(dest, R(NEGBIT));
}
}
void JitCompiler::Compile_DestEnable(Instruction instr,X64Reg src) {
DestRegister dest;
unsigned operand_desc_id;
if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MAD ||
instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI) {
operand_desc_id = instr.mad.operand_desc_id;
dest = instr.mad.dest.Value();
} else {
operand_desc_id = instr.common.operand_desc_id;
dest = instr.common.dest.Value();
}
SwizzlePattern swiz = { g_state.vs.swizzle_data[operand_desc_id] };
// If all components are enabled, write the result to the destination register
if (swiz.dest_mask == NO_DEST_REG_MASK) {
// Store dest back to memory
MOVAPS(MDisp(REGISTERS, UnitState<false>::OutputOffset(dest)), src);
} else {
// Not all components are enabled, so mask the result when storing to the destination register...
MOVAPS(SCRATCH, MDisp(REGISTERS, UnitState<false>::OutputOffset(dest)));
if (Common::GetCPUCaps().sse4_1) {
u8 mask = ((swiz.dest_mask & 1) << 3) | ((swiz.dest_mask & 8) >> 3) | ((swiz.dest_mask & 2) << 1) | ((swiz.dest_mask & 4) >> 1);
BLENDPS(SCRATCH, R(src), mask);
} else {
MOVAPS(XMM4, R(src));
UNPCKHPS(XMM4, R(SCRATCH)); // Unpack X/Y components of source and destination
UNPCKLPS(SCRATCH, R(src)); // Unpack Z/W components of source and destination
// Compute selector to selectively copy source components to destination for SHUFPS instruction
u8 sel = ((swiz.DestComponentEnabled(0) ? 1 : 0) << 0) |
((swiz.DestComponentEnabled(1) ? 3 : 2) << 2) |
((swiz.DestComponentEnabled(2) ? 0 : 1) << 4) |
((swiz.DestComponentEnabled(3) ? 2 : 3) << 6);
SHUFPS(SCRATCH, R(XMM4), sel);
}
// Store dest back to memory
MOVAPS(MDisp(REGISTERS, UnitState<false>::OutputOffset(dest)), SCRATCH);
}
}
void JitCompiler::Compile_EvaluateCondition(Instruction instr) {
// Note: NXOR is used below to check for equality
switch (instr.flow_control.op) {
case Instruction::FlowControlType::Or:
MOV(32, R(RAX), R(COND0));
MOV(32, R(RBX), R(COND1));
XOR(32, R(RAX), Imm32(instr.flow_control.refx.Value() ^ 1));
XOR(32, R(RBX), Imm32(instr.flow_control.refy.Value() ^ 1));
OR(32, R(RAX), R(RBX));
break;
case Instruction::FlowControlType::And:
MOV(32, R(RAX), R(COND0));
MOV(32, R(RBX), R(COND1));
XOR(32, R(RAX), Imm32(instr.flow_control.refx.Value() ^ 1));
XOR(32, R(RBX), Imm32(instr.flow_control.refy.Value() ^ 1));
AND(32, R(RAX), R(RBX));
break;
case Instruction::FlowControlType::JustX:
MOV(32, R(RAX), R(COND0));
XOR(32, R(RAX), Imm32(instr.flow_control.refx.Value() ^ 1));
break;
case Instruction::FlowControlType::JustY:
MOV(32, R(RAX), R(COND1));
XOR(32, R(RAX), Imm32(instr.flow_control.refy.Value() ^ 1));
break;
}
}
void JitCompiler::Compile_UniformCondition(Instruction instr) {
int offset = offsetof(decltype(g_state.vs.uniforms), b) + (instr.flow_control.bool_uniform_id * sizeof(bool));
CMP(sizeof(bool) * 8, MDisp(UNIFORMS, offset), Imm8(0));
}
void JitCompiler::Compile_PushCallerSavedXMM() {
#ifndef _WIN32
SUB(64, R(RSP), Imm8(2 * 16));
MOVUPS(MDisp(RSP, 16), ONE);
MOVUPS(MDisp(RSP, 0), NEGBIT);
#endif
}
void JitCompiler::Compile_PopCallerSavedXMM() {
#ifndef _WIN32
MOVUPS(NEGBIT, MDisp(RSP, 0));
MOVUPS(ONE, MDisp(RSP, 16));
ADD(64, R(RSP), Imm8(2 * 16));
#endif
}
void JitCompiler::Compile_ADD(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
ADDPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_DP3(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
if (Common::GetCPUCaps().sse4_1) {
DPPS(SRC1, R(SRC2), 0x7f);
} else {
MULPS(SRC1, R(SRC2));
MOVAPS(SRC2, R(SRC1));
SHUFPS(SRC2, R(SRC2), _MM_SHUFFLE(1, 1, 1, 1));
MOVAPS(SRC3, R(SRC1));
SHUFPS(SRC3, R(SRC3), _MM_SHUFFLE(2, 2, 2, 2));
SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 0, 0, 0));
ADDPS(SRC1, R(SRC2));
ADDPS(SRC1, R(SRC3));
}
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_DP4(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
if (Common::GetCPUCaps().sse4_1) {
DPPS(SRC1, R(SRC2), 0xff);
} else {
MULPS(SRC1, R(SRC2));
MOVAPS(SRC2, R(SRC1));
SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(2, 3, 0, 1)); // XYZW -> ZWXY
ADDPS(SRC1, R(SRC2));
MOVAPS(SRC2, R(SRC1));
SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 1, 2, 3)); // XYZW -> WZYX
ADDPS(SRC1, R(SRC2));
}
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_EX2(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
MOVSS(XMM0, R(SRC1));
// The following will actually break the stack alignment
ABI_PushAllCallerSavedRegsAndAdjustStack();
Compile_PushCallerSavedXMM();
ABI_CallFunction(reinterpret_cast<const void*>(exp2f));
Compile_PopCallerSavedXMM();
ABI_PopAllCallerSavedRegsAndAdjustStack();
SHUFPS(XMM0, R(XMM0), _MM_SHUFFLE(0, 0, 0, 0));
MOVAPS(SRC1, R(XMM0));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_LG2(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
MOVSS(XMM0, R(SRC1));
// The following will actually break the stack alignment
ABI_PushAllCallerSavedRegsAndAdjustStack();
Compile_PushCallerSavedXMM();
ABI_CallFunction(reinterpret_cast<const void*>(log2f));
Compile_PopCallerSavedXMM();
ABI_PopAllCallerSavedRegsAndAdjustStack();
SHUFPS(XMM0, R(XMM0), _MM_SHUFFLE(0, 0, 0, 0));
MOVAPS(SRC1, R(XMM0));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_MUL(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
MULPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_SGE(Instruction instr) {
if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::SGEI) {
Compile_SwizzleSrc(instr, 1, instr.common.src1i, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2i, SRC2);
} else {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
}
CMPPS(SRC1, R(SRC2), CMP_NLT);
ANDPS(SRC1, R(ONE));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_SLT(Instruction instr) {
if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::SLTI) {
Compile_SwizzleSrc(instr, 1, instr.common.src1i, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2i, SRC2);
} else {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
}
CMPPS(SRC1, R(SRC2), CMP_LT);
ANDPS(SRC1, R(ONE));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_FLR(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
if (Common::GetCPUCaps().sse4_1) {
ROUNDFLOORPS(SRC1, R(SRC1));
} else {
CVTPS2DQ(SRC1, R(SRC1));
CVTDQ2PS(SRC1, R(SRC1));
}
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_MAX(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
MAXPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_MIN(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
MINPS(SRC1, R(SRC2));
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_MOVA(Instruction instr) {
SwizzlePattern swiz = { g_state.vs.swizzle_data[instr.common.operand_desc_id] };
if (!swiz.DestComponentEnabled(0) && !swiz.DestComponentEnabled(1)) {
return; // NoOp
}
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
// Convert floats to integers (only care about X and Y components)
CVTPS2DQ(SRC1, R(SRC1));
// Get result
MOVQ_xmm(R(RAX), SRC1);
// Handle destination enable
if (swiz.DestComponentEnabled(0) && swiz.DestComponentEnabled(1)) {
// Move and sign-extend low 32 bits
MOVSX(64, 32, ADDROFFS_REG_0, R(RAX));
// Move and sign-extend high 32 bits
SHR(64, R(RAX), Imm8(32));
MOVSX(64, 32, ADDROFFS_REG_1, R(RAX));
// Multiply by 16 to be used as an offset later
SHL(64, R(ADDROFFS_REG_0), Imm8(4));
SHL(64, R(ADDROFFS_REG_1), Imm8(4));
} else {
if (swiz.DestComponentEnabled(0)) {
// Move and sign-extend low 32 bits
MOVSX(64, 32, ADDROFFS_REG_0, R(RAX));
// Multiply by 16 to be used as an offset later
SHL(64, R(ADDROFFS_REG_0), Imm8(4));
} else if (swiz.DestComponentEnabled(1)) {
// Move and sign-extend high 32 bits
SHR(64, R(RAX), Imm8(32));
MOVSX(64, 32, ADDROFFS_REG_1, R(RAX));
// Multiply by 16 to be used as an offset later
SHL(64, R(ADDROFFS_REG_1), Imm8(4));
}
}
}
void JitCompiler::Compile_MOV(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_RCP(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
// TODO(bunnei): RCPSS is a pretty rough approximation, this might cause problems if Pica
// performs this operation more accurately. This should be checked on hardware.
RCPSS(SRC1, R(SRC1));
SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 0, 0, 0)); // XYWZ -> XXXX
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_RSQ(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
// TODO(bunnei): RSQRTSS is a pretty rough approximation, this might cause problems if Pica
// performs this operation more accurately. This should be checked on hardware.
RSQRTSS(SRC1, R(SRC1));
SHUFPS(SRC1, R(SRC1), _MM_SHUFFLE(0, 0, 0, 0)); // XYWZ -> XXXX
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_NOP(Instruction instr) {
}
void JitCompiler::Compile_END(Instruction instr) {
ABI_PopAllCalleeSavedRegsAndAdjustStack();
RET();
}
void JitCompiler::Compile_CALL(Instruction instr) {
unsigned offset = instr.flow_control.dest_offset;
while (offset < (instr.flow_control.dest_offset + instr.flow_control.num_instructions)) {
Compile_NextInstr(&offset);
}
}
void JitCompiler::Compile_CALLC(Instruction instr) {
Compile_EvaluateCondition(instr);
FixupBranch b = J_CC(CC_Z, true);
Compile_CALL(instr);
SetJumpTarget(b);
}
void JitCompiler::Compile_CALLU(Instruction instr) {
Compile_UniformCondition(instr);
FixupBranch b = J_CC(CC_Z, true);
Compile_CALL(instr);
SetJumpTarget(b);
}
void JitCompiler::Compile_CMP(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.common.src1, SRC1);
Compile_SwizzleSrc(instr, 2, instr.common.src2, SRC2);
static const u8 cmp[] = { CMP_EQ, CMP_NEQ, CMP_LT, CMP_LE, CMP_NLE, CMP_NLT };
if (instr.common.compare_op.x == instr.common.compare_op.y) {
// Compare X-component and Y-component together
CMPPS(SRC1, R(SRC2), cmp[instr.common.compare_op.x]);
MOVQ_xmm(R(COND0), SRC1);
MOV(64, R(COND1), R(COND0));
} else {
// Compare X-component
MOVAPS(SCRATCH, R(SRC1));
CMPSS(SCRATCH, R(SRC2), cmp[instr.common.compare_op.x]);
// Compare Y-component
CMPPS(SRC1, R(SRC2), cmp[instr.common.compare_op.y]);
MOVQ_xmm(R(COND0), SCRATCH);
MOVQ_xmm(R(COND1), SRC1);
}
SHR(32, R(COND0), Imm8(31));
SHR(64, R(COND1), Imm8(63));
}
void JitCompiler::Compile_MAD(Instruction instr) {
Compile_SwizzleSrc(instr, 1, instr.mad.src1, SRC1);
if (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI) {
Compile_SwizzleSrc(instr, 2, instr.mad.src2i, SRC2);
Compile_SwizzleSrc(instr, 3, instr.mad.src3i, SRC3);
} else {
Compile_SwizzleSrc(instr, 2, instr.mad.src2, SRC2);
Compile_SwizzleSrc(instr, 3, instr.mad.src3, SRC3);
}
if (Common::GetCPUCaps().fma) {
VFMADD213PS(SRC1, SRC2, R(SRC3));
} else {
MULPS(SRC1, R(SRC2));
ADDPS(SRC1, R(SRC3));
}
Compile_DestEnable(instr, SRC1);
}
void JitCompiler::Compile_IF(Instruction instr) {
ASSERT_MSG(instr.flow_control.dest_offset > *offset_ptr, "Backwards if-statements not supported");
// Evaluate the "IF" condition
if (instr.opcode.Value() == OpCode::Id::IFU) {
Compile_UniformCondition(instr);
} else if (instr.opcode.Value() == OpCode::Id::IFC) {
Compile_EvaluateCondition(instr);
}
FixupBranch b = J_CC(CC_Z, true);
// Compile the code that corresponds to the condition evaluating as true
Compile_Block(instr.flow_control.dest_offset - 1);
// If there isn't an "ELSE" condition, we are done here
if (instr.flow_control.num_instructions == 0) {
SetJumpTarget(b);
return;
}
FixupBranch b2 = J(true);
SetJumpTarget(b);
// This code corresponds to the "ELSE" condition
// Comple the code that corresponds to the condition evaluating as false
Compile_Block(instr.flow_control.dest_offset + instr.flow_control.num_instructions - 1);
SetJumpTarget(b2);
}
void JitCompiler::Compile_LOOP(Instruction instr) {
ASSERT_MSG(instr.flow_control.dest_offset > *offset_ptr, "Backwards loops not supported");
ASSERT_MSG(!looping, "Nested loops not supported");
looping = true;
int offset = offsetof(decltype(g_state.vs.uniforms), i) + (instr.flow_control.int_uniform_id * sizeof(Math::Vec4<u8>));
MOV(32, R(LOOPCOUNT), MDisp(UNIFORMS, offset));
MOV(32, R(LOOPCOUNT_REG), R(LOOPCOUNT));
SHR(32, R(LOOPCOUNT_REG), Imm8(8));
AND(32, R(LOOPCOUNT_REG), Imm32(0xff)); // Y-component is the start
MOV(32, R(LOOPINC), R(LOOPCOUNT));
SHR(32, R(LOOPINC), Imm8(16));
MOVZX(32, 8, LOOPINC, R(LOOPINC)); // Z-component is the incrementer
MOVZX(32, 8, LOOPCOUNT, R(LOOPCOUNT)); // X-component is iteration count
ADD(32, R(LOOPCOUNT), Imm8(1)); // Iteration count is X-component + 1
auto loop_start = GetCodePtr();
Compile_Block(instr.flow_control.dest_offset);
ADD(32, R(LOOPCOUNT_REG), R(LOOPINC)); // Increment LOOPCOUNT_REG by Z-component
SUB(32, R(LOOPCOUNT), Imm8(1)); // Increment loop count by 1
J_CC(CC_NZ, loop_start); // Loop if not equal
looping = false;
}
void JitCompiler::Compile_JMP(Instruction instr) {
ASSERT_MSG(instr.flow_control.dest_offset > *offset_ptr, "Backwards jumps not supported");
if (instr.opcode.Value() == OpCode::Id::JMPC)
Compile_EvaluateCondition(instr);
else if (instr.opcode.Value() == OpCode::Id::JMPU)
Compile_UniformCondition(instr);
else
UNREACHABLE();
FixupBranch b = J_CC(CC_NZ, true);
Compile_Block(instr.flow_control.dest_offset);
SetJumpTarget(b);
}
void JitCompiler::Compile_Block(unsigned stop) {
// Save current offset pointer
unsigned* prev_offset_ptr = offset_ptr;
unsigned offset = *prev_offset_ptr;
while (offset <= stop)
Compile_NextInstr(&offset);
// Restore current offset pointer
offset_ptr = prev_offset_ptr;
*offset_ptr = offset;
}
void JitCompiler::Compile_NextInstr(unsigned* offset) {
offset_ptr = offset;
Instruction instr = *(Instruction*)&g_state.vs.program_code[(*offset_ptr)++];
OpCode::Id opcode = instr.opcode.Value();
auto instr_func = instr_table[static_cast<unsigned>(opcode)];
if (instr_func) {
// JIT the instruction!
((*this).*instr_func)(instr);
} else {
// Unhandled instruction
LOG_CRITICAL(HW_GPU, "Unhandled instruction: 0x%02x (0x%08x)", instr.opcode.Value(), instr.hex);
}
}
CompiledShader* JitCompiler::Compile() {
const u8* start = GetCodePtr();
const auto& code = g_state.vs.program_code;
unsigned offset = g_state.regs.vs.main_offset;
ABI_PushAllCalleeSavedRegsAndAdjustStack();
MOV(PTRBITS, R(REGISTERS), R(ABI_PARAM1));
MOV(PTRBITS, R(UNIFORMS), ImmPtr(&g_state.vs.uniforms));
// Zero address/loop registers
XOR(64, R(ADDROFFS_REG_0), R(ADDROFFS_REG_0));
XOR(64, R(ADDROFFS_REG_1), R(ADDROFFS_REG_1));
XOR(64, R(LOOPCOUNT_REG), R(LOOPCOUNT_REG));
// Used to set a register to one
static const __m128 one = { 1.f, 1.f, 1.f, 1.f };
MOV(PTRBITS, R(RAX), ImmPtr(&one));
MOVAPS(ONE, MDisp(RAX, 0));
// Used to negate registers
static const __m128 neg = { -0.f, -0.f, -0.f, -0.f };
MOV(PTRBITS, R(RAX), ImmPtr(&neg));
MOVAPS(NEGBIT, MDisp(RAX, 0));
looping = false;
while (offset < g_state.vs.program_code.size()) {
Compile_NextInstr(&offset);
}
return (CompiledShader*)start;
}
JitCompiler::JitCompiler() {
AllocCodeSpace(1024 * 1024 * 4);
}
void JitCompiler::Clear() {
ClearCodeSpace();
}
} // namespace Shader
} // namespace Pica