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Code Issues Releases Activity

shader_decode: implement XMAD mode CSfu

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Nguyen Dac Nam 2020-03-13 19:01:49 +07:00 committed by GitHub
parent 00e9ba0603
commit a166217480
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 41 additions and 9 deletions
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50
src/video_core/shader/decode/xmad.cpp
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@ -12,6 +12,7 @@ namespace VideoCommon::Shader {
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::PredCondition;
u32 ShaderIR::DecodeXmad(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
@ -63,15 +64,18 @@ u32 ShaderIR::DecodeXmad(NodeBlock& bb, u32 pc) {
}
}();
op_a = BitfieldExtract(op_a, instr.xmad.high_a ? 16 : 0, 16);
op_a = SignedOperation(OperationCode::IBitfieldExtract, is_signed_a, std::move(op_a),
instr.xmad.high_a ? Immediate(16) : Immediate(0), Immediate(16));
const Node original_b = op_b;
op_b = BitfieldExtract(op_b, is_high_b ? 16 : 0, 16);
op_b = SignedOperation(OperationCode::IBitfieldExtract, is_signed_b, std::move(op_b),
is_high_b ? Immediate(16) : Immediate(0), Immediate(16));
// TODO(Rodrigo): Use an appropiate sign for this operation
Node product = Operation(OperationCode::IMul, NO_PRECISE, op_a, op_b);
// we already check sign_a and sign_b is difference or not before so just use one in here.
Node product = SignedOperation(OperationCode::IMul, is_signed_a, op_a, op_b);
if (is_psl) {
product = Operation(OperationCode::ILogicalShiftLeft, NO_PRECISE, product, Immediate(16));
product =
SignedOperation(OperationCode::ILogicalShiftLeft, is_signed_a, product, Immediate(16));
}
SetTemporary(bb, 0, product);
product = GetTemporary(0);
@ -88,12 +92,40 @@ u32 ShaderIR::DecodeXmad(NodeBlock& bb, u32 pc) {
return BitfieldExtract(original_c, 16, 16);
case Tegra::Shader::XmadMode::CBcc: {
const Node shifted_b = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed_b,
NO_PRECISE, original_b, Immediate(16));
return SignedOperation(OperationCode::IAdd, is_signed_c, NO_PRECISE, original_c,
shifted_b);
original_b, Immediate(16));
return SignedOperation(OperationCode::IAdd, is_signed_c, original_c, shifted_b);
}
case Tegra::Shader::XmadMode::CSfu: {
const Node comp_a = GetPredicateComparisonInteger(PredCondition::Equal, is_signed_a,
op_a, Immediate(0));
const Node comp_b = GetPredicateComparisonInteger(PredCondition::Equal, is_signed_b,
op_b, Immediate(0));
const Node comp =
Operation(OperationCode::LogicalOr, std::move(comp_a), std::move(comp_b));
const Node comp_minus_a = GetPredicateComparisonInteger(
PredCondition::NotEqual, is_signed_a,
SignedOperation(OperationCode::IBitwiseAnd, is_signed_a, op_a,
Immediate(0x80000000)),
Immediate(0));
const Node comp_minus_b = GetPredicateComparisonInteger(
PredCondition::NotEqual, is_signed_b,
SignedOperation(OperationCode::IBitwiseAnd, is_signed_b, op_b,
Immediate(0x80000000)),
Immediate(0));
Node new_c = Operation(
OperationCode::Select, comp_minus_a,
SignedOperation(OperationCode::IAdd, is_signed_c, original_c, Immediate(-65536)),
original_c);
new_c = Operation(
OperationCode::Select, comp_minus_b,
SignedOperation(OperationCode::IAdd, is_signed_c, new_c, Immediate(-65536)), new_c);
return Operation(OperationCode::Select, comp, original_c, new_c);
}
default:
UNIMPLEMENTED_MSG("Unhandled XMAD mode: {}", static_cast<u32>(instr.xmad.mode.Value()));
UNREACHABLE();
return Immediate(0);
}
}();