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Code Issues Releases Activity

decode/register_set_predicate: Implement CC

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P2R CC takes the state of condition codes and puts them into a register.
We already have this implemented for PR (predicates). This commit
implements CC over that.
This commit is contained in:
ReinUsesLisp 2020-04-25 19:05:34 -03:00
parent d523734266
commit ffc5ec6fa8
1 changed files with 14 additions and 9 deletions
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23
src/video_core/shader/decode/register_set_predicate.cpp
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@ -17,15 +17,14 @@ using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
namespace {
constexpr u64 NUM_PROGRAMMABLE_PREDICATES = 7;
}
constexpr u64 NUM_CONDITION_CODES = 4;
constexpr u64 NUM_PREDICATES = 7;
} // namespace
u32 ShaderIR::DecodeRegisterSetPredicate(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
UNIMPLEMENTED_IF(instr.p2r_r2p.mode != Tegra::Shader::R2pMode::Pr);
Node apply_mask = [this, opcode, instr] {
switch (opcode->get().GetId()) {
case OpCode::Id::R2P_IMM:
@ -39,12 +38,18 @@ u32 ShaderIR::DecodeRegisterSetPredicate(NodeBlock& bb, u32 pc) {
const u32 offset = static_cast<u32>(instr.p2r_r2p.byte) * 8;
const bool cc = instr.p2r_r2p.mode == Tegra::Shader::R2pMode::Cc;
const u64 num_entries = cc ? NUM_CONDITION_CODES : NUM_PREDICATES;
const auto get_entry = [this, cc](u64 entry) {
return cc ? GetInternalFlag(static_cast<InternalFlag>(entry)) : GetPredicate(entry);
};
switch (opcode->get().GetId()) {
case OpCode::Id::R2P_IMM: {
Node mask = GetRegister(instr.gpr8);
for (u64 pred = 0; pred < NUM_PROGRAMMABLE_PREDICATES; ++pred) {
const u32 shift = static_cast<u32>(pred);
for (u64 entry = 0; entry < num_entries; ++entry) {
const u32 shift = static_cast<u32>(entry);
Node apply = BitfieldExtract(apply_mask, shift, 1);
Node condition = Operation(OperationCode::LogicalUNotEqual, apply, Immediate(0));
@ -52,15 +57,15 @@ u32 ShaderIR::DecodeRegisterSetPredicate(NodeBlock& bb, u32 pc) {
Node compare = BitfieldExtract(mask, offset + shift, 1);
Node value = Operation(OperationCode::LogicalUNotEqual, move(compare), Immediate(0));
Node code = Operation(OperationCode::LogicalAssign, GetPredicate(pred), move(value));
Node code = Operation(OperationCode::LogicalAssign, get_entry(entry), move(value));
bb.push_back(Conditional(condition, {move(code)}));
}
break;
}
case OpCode::Id::P2R_IMM: {
Node value = Immediate(0);
for (u64 pred = 0; pred < NUM_PROGRAMMABLE_PREDICATES; ++pred) {
Node bit = Operation(OperationCode::Select, GetPredicate(pred), Immediate(1U << pred),
for (u64 entry = 0; entry < num_entries; ++entry) {
Node bit = Operation(OperationCode::Select, get_entry(entry), Immediate(1U << entry),
Immediate(0));
value = Operation(OperationCode::UBitwiseOr, move(value), move(bit));
}