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gl_shader_decompiler: Implement VMAD

This commit is contained in:
ReinUsesLisp 2018-10-11 03:56:14 -03:00
parent 6d82c4adf9
commit 17290a4416
2 changed files with 118 additions and 0 deletions
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36
src/video_core/engines/shader_bytecode.h
View File

@ -214,6 +214,18 @@ enum class IMinMaxExchange : u64 {
XHi = 3,
};
enum class VmadType : u64 {
Size16_Low = 0,
Size16_High = 1,
Size32 = 2,
Invalid = 3,
};
enum class VmadShr : u64 {
Shr7 = 1,
Shr15 = 2,
};
enum class XmadMode : u64 {
None = 0,
CLo = 1,
@ -452,6 +464,7 @@ union Instruction {
BitField<48, 16, u64> opcode;
union {
BitField<20, 16, u64> imm20_16;
BitField<20, 19, u64> imm20_19;
BitField<20, 32, s64> imm20_32;
BitField<45, 1, u64> negate_b;
@ -493,6 +506,10 @@ union Instruction {
}
} lop3;
u16 GetImm20_16() const {
return static_cast<u16>(imm20_16);
}
u32 GetImm20_19() const {
u32 imm{static_cast<u32>(imm20_19)};
imm <<= 12;
@ -1016,6 +1033,23 @@ union Instruction {
BitField<47, 2, IsberdShift> shift;
} isberd;
union {
BitField<48, 1, u64> signed_a;
BitField<38, 1, u64> is_byte_chunk_a;
BitField<36, 2, VmadType> type_a;
BitField<36, 2, u64> byte_height_a;
BitField<49, 1, u64> signed_b;
BitField<50, 1, u64> use_register_b;
BitField<30, 1, u64> is_byte_chunk_b;
BitField<28, 2, VmadType> type_b;
BitField<28, 2, u64> byte_height_b;
BitField<51, 2, VmadShr> shr;
BitField<55, 1, u64> saturate; // Saturates the result (a * b + c)
BitField<47, 1, u64> cc;
} vmad;
union {
BitField<20, 16, u64> imm20_16;
BitField<36, 1, u64> product_shift_left;
@ -1083,6 +1117,7 @@ public:
IPA,
OUT_R, // Emit vertex/primitive
ISBERD,
VMAD,
FFMA_IMM, // Fused Multiply and Add
FFMA_CR,
FFMA_RC,
@ -1320,6 +1355,7 @@ private:
INST("11100000--------", Id::IPA, Type::Trivial, "IPA"),
INST("1111101111100---", Id::OUT_R, Type::Trivial, "OUT_R"),
INST("1110111111010---", Id::ISBERD, Type::Trivial, "ISBERD"),
INST("01011111--------", Id::VMAD, Type::Trivial, "VMAD"),
INST("0011001-1-------", Id::FFMA_IMM, Type::Ffma, "FFMA_IMM"),
INST("010010011-------", Id::FFMA_CR, Type::Ffma, "FFMA_CR"),
INST("010100011-------", Id::FFMA_RC, Type::Ffma, "FFMA_RC"),

82
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View File

@ -2953,6 +2953,88 @@ private:
LOG_WARNING(HW_GPU, "DEPBAR instruction is stubbed");
break;
}
case OpCode::Id::VMAD: {
const bool signed_a = instr.vmad.signed_a == 1;
const bool signed_b = instr.vmad.signed_b == 1;
const bool result_signed = signed_a || signed_b;
boost::optional<std::string> forced_result;
auto Unpack = [&](const std::string& op, bool is_chunk, bool is_signed,
Tegra::Shader::VmadType type, u64 byte_height) {
const std::string value = [&]() {
if (!is_chunk) {
const auto offset = static_cast<u32>(byte_height * 8);
return "((" + op + " >> " + std::to_string(offset) + ") & 0xff)";
}
const std::string zero = "0";
switch (type) {
case Tegra::Shader::VmadType::Size16_Low:
return '(' + op + " & 0xffff)";
case Tegra::Shader::VmadType::Size16_High:
return '(' + op + " >> 16)";
case Tegra::Shader::VmadType::Size32:
// TODO(Rodrigo): From my hardware tests it becomes a bit "mad" when
// this type is used (1 * 1 + 0 == 0x5b800000). Until a better
// explanation is found: assert.
UNREACHABLE_MSG("Unimplemented");
return zero;
case Tegra::Shader::VmadType::Invalid:
// Note(Rodrigo): This flag is invalid according to nvdisasm. From my
// testing (even though it's invalid) this makes the whole instruction
// assign zero to target register.
forced_result = boost::make_optional(zero);
return zero;
default:
UNREACHABLE();
return zero;
}
}();
if (is_signed) {
return "int(" + value + ')';
}
return value;
};
const std::string op_a = Unpack(regs.GetRegisterAsInteger(instr.gpr8, 0, false),
instr.vmad.is_byte_chunk_a != 0, signed_a,
instr.vmad.type_a, instr.vmad.byte_height_a);
std::string op_b;
if (instr.vmad.use_register_b) {
op_b = Unpack(regs.GetRegisterAsInteger(instr.gpr20, 0, false),
instr.vmad.is_byte_chunk_b != 0, signed_b, instr.vmad.type_b,
instr.vmad.byte_height_b);
} else {
op_b = '(' +
std::to_string(signed_b ? static_cast<s16>(instr.alu.GetImm20_16())
: instr.alu.GetImm20_16()) +
')';
}
const std::string op_c = regs.GetRegisterAsInteger(instr.gpr39, 0, result_signed);
std::string result;
if (forced_result) {
result = *forced_result;
} else {
result = '(' + op_a + " * " + op_b + " + " + op_c + ')';
switch (instr.vmad.shr) {
case Tegra::Shader::VmadShr::Shr7:
result = '(' + result + " >> 7)";
break;
case Tegra::Shader::VmadShr::Shr15:
result = '(' + result + " >> 15)";
break;
}
}
regs.SetRegisterToInteger(instr.gpr0, result_signed, 1, result, 1, 1,
instr.vmad.saturate == 1, 0, Register::Size::Word,
instr.vmad.cc);
break;
}
default: {
LOG_CRITICAL(HW_GPU, "Unhandled instruction: {}", opcode->GetName());
UNREACHABLE();