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-rw-r--r--src/video_core/engines/shader_bytecode.h20
-rw-r--r--src/video_core/shader/decode/shift.cpp113
2 files changed, 122 insertions, 11 deletions
diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index 81b6d9eff..402869fde 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -624,6 +624,19 @@ enum class ShuffleOperation : u64 {
Bfly = 3, // shuffleXorNV
};
+enum class ShfType : u64 {
+ Bits32 = 0,
+ U64 = 2,
+ S64 = 3,
+};
+
+enum class ShfXmode : u64 {
+ None = 0,
+ HI = 1,
+ X = 2,
+ XHI = 3,
+};
+
union Instruction {
constexpr Instruction& operator=(const Instruction& instr) {
value = instr.value;
@@ -776,6 +789,13 @@ union Instruction {
} shr;
union {
+ BitField<37, 2, ShfType> type;
+ BitField<48, 2, ShfXmode> xmode;
+ BitField<50, 1, u64> wrap;
+ BitField<20, 6, u64> immediate;
+ } shf;
+
+ union {
BitField<39, 5, u64> shift_amount;
BitField<48, 1, u64> negate_b;
BitField<49, 1, u64> negate_a;
diff --git a/src/video_core/shader/decode/shift.cpp b/src/video_core/shader/decode/shift.cpp
index d419e9c45..3b391d3e6 100644
--- a/src/video_core/shader/decode/shift.cpp
+++ b/src/video_core/shader/decode/shift.cpp
@@ -10,8 +10,80 @@
namespace VideoCommon::Shader {
+using std::move;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
+using Tegra::Shader::ShfType;
+using Tegra::Shader::ShfXmode;
+
+namespace {
+
+Node IsFull(Node shift) {
+ return Operation(OperationCode::LogicalIEqual, move(shift), Immediate(32));
+}
+
+Node Shift(OperationCode opcode, Node value, Node shift) {
+ Node is_full = Operation(OperationCode::LogicalIEqual, shift, Immediate(32));
+ Node shifted = Operation(opcode, move(value), shift);
+ return Operation(OperationCode::Select, IsFull(move(shift)), Immediate(0), move(shifted));
+}
+
+Node ClampShift(Node shift, s32 size = 32) {
+ shift = Operation(OperationCode::IMax, move(shift), Immediate(0));
+ return Operation(OperationCode::IMin, move(shift), Immediate(size));
+}
+
+Node WrapShift(Node shift, s32 size = 32) {
+ return Operation(OperationCode::UBitwiseAnd, move(shift), Immediate(size - 1));
+}
+
+Node ShiftRight(Node low, Node high, Node shift, Node low_shift, ShfType type) {
+ // These values are used when the shift value is less than 32
+ Node less_low = Shift(OperationCode::ILogicalShiftRight, low, shift);
+ Node less_high = Shift(OperationCode::ILogicalShiftLeft, high, low_shift);
+ Node less = Operation(OperationCode::IBitwiseOr, move(less_high), move(less_low));
+
+ if (type == ShfType::Bits32) {
+ // On 32 bit shifts we are either full (shifting 32) or shifting less than 32 bits
+ return Operation(OperationCode::Select, IsFull(move(shift)), move(high), move(less));
+ }
+
+ // And these when it's larger than or 32
+ const bool is_signed = type == ShfType::S64;
+ const auto opcode = SignedToUnsignedCode(OperationCode::IArithmeticShiftRight, is_signed);
+ Node reduced = Operation(OperationCode::IAdd, shift, Immediate(-32));
+ Node greater = Shift(opcode, high, move(reduced));
+
+ Node is_less = Operation(OperationCode::LogicalILessThan, shift, Immediate(32));
+ Node is_zero = Operation(OperationCode::LogicalIEqual, move(shift), Immediate(0));
+
+ Node value = Operation(OperationCode::Select, move(is_less), move(less), move(greater));
+ return Operation(OperationCode::Select, move(is_zero), move(high), move(value));
+}
+
+Node ShiftLeft(Node low, Node high, Node shift, Node low_shift, ShfType type) {
+ // These values are used when the shift value is less than 32
+ Node less_low = Operation(OperationCode::ILogicalShiftRight, low, low_shift);
+ Node less_high = Operation(OperationCode::ILogicalShiftLeft, high, shift);
+ Node less = Operation(OperationCode::IBitwiseOr, move(less_low), move(less_high));
+
+ if (type == ShfType::Bits32) {
+ // On 32 bit shifts we are either full (shifting 32) or shifting less than 32 bits
+ return Operation(OperationCode::Select, IsFull(move(shift)), move(low), move(less));
+ }
+
+ // And these when it's larger than or 32
+ Node reduced = Operation(OperationCode::IAdd, shift, Immediate(-32));
+ Node greater = Shift(OperationCode::ILogicalShiftLeft, move(low), move(reduced));
+
+ Node is_less = Operation(OperationCode::LogicalILessThan, shift, Immediate(32));
+ Node is_zero = Operation(OperationCode::LogicalIEqual, move(shift), Immediate(0));
+
+ Node value = Operation(OperationCode::Select, move(is_less), move(less), move(greater));
+ return Operation(OperationCode::Select, move(is_zero), move(high), move(value));
+}
+
+} // Anonymous namespace
u32 ShaderIR::DecodeShift(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
@@ -28,29 +100,48 @@ u32 ShaderIR::DecodeShift(NodeBlock& bb, u32 pc) {
}
}();
- switch (opcode->get().GetId()) {
+ switch (const auto opid = opcode->get().GetId(); opid) {
case OpCode::Id::SHR_C:
case OpCode::Id::SHR_R:
case OpCode::Id::SHR_IMM: {
- if (instr.shr.wrap) {
- op_b = Operation(OperationCode::UBitwiseAnd, std::move(op_b), Immediate(0x1f));
- } else {
- op_b = Operation(OperationCode::IMax, std::move(op_b), Immediate(0));
- op_b = Operation(OperationCode::IMin, std::move(op_b), Immediate(31));
- }
+ op_b = instr.shr.wrap ? WrapShift(move(op_b)) : ClampShift(move(op_b));
Node value = SignedOperation(OperationCode::IArithmeticShiftRight, instr.shift.is_signed,
- std::move(op_a), std::move(op_b));
+ move(op_a), move(op_b));
SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
- SetRegister(bb, instr.gpr0, std::move(value));
+ SetRegister(bb, instr.gpr0, move(value));
break;
}
case OpCode::Id::SHL_C:
case OpCode::Id::SHL_R:
case OpCode::Id::SHL_IMM: {
- const Node value = Operation(OperationCode::ILogicalShiftLeft, op_a, op_b);
+ Node value = Operation(OperationCode::ILogicalShiftLeft, op_a, op_b);
SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
- SetRegister(bb, instr.gpr0, value);
+ SetRegister(bb, instr.gpr0, move(value));
+ break;
+ }
+ case OpCode::Id::SHF_RIGHT_R:
+ case OpCode::Id::SHF_RIGHT_IMM:
+ case OpCode::Id::SHF_LEFT_R:
+ case OpCode::Id::SHF_LEFT_IMM: {
+ UNIMPLEMENTED_IF(instr.generates_cc);
+ UNIMPLEMENTED_IF_MSG(instr.shf.xmode != ShfXmode::None, "xmode={}",
+ static_cast<int>(instr.shf.xmode.Value()));
+
+ if (instr.is_b_imm) {
+ op_b = Immediate(static_cast<u32>(instr.shf.immediate));
+ }
+ const s32 size = instr.shf.type == ShfType::Bits32 ? 32 : 64;
+ Node shift = instr.shf.wrap ? WrapShift(move(op_b), size) : ClampShift(move(op_b), size);
+
+ Node negated_shift = Operation(OperationCode::INegate, shift);
+ Node low_shift = Operation(OperationCode::IAdd, move(negated_shift), Immediate(32));
+
+ const bool is_right = opid == OpCode::Id::SHF_RIGHT_R || opid == OpCode::Id::SHF_RIGHT_IMM;
+ Node value = (is_right ? ShiftRight : ShiftLeft)(
+ move(op_a), GetRegister(instr.gpr39), move(shift), move(low_shift), instr.shf.type);
+
+ SetRegister(bb, instr.gpr0, move(value));
break;
}
default:
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 02:59:36 +0100