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[TableGen] Slim down the data structures in xxxGenInstrInfo.inc, step 1

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This commit is contained in:
Paul C. Anagnostopoulos 2020-12-11 16:19:52 -05:00
parent 0fedcd35f9
commit 0f58806903
1 changed files with 14 additions and 4 deletions
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18
utils/TableGen/InstrInfoEmitter.cpp
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@ -371,7 +371,7 @@ void InstrInfoEmitter::emitOperandTypeMappings(
OS << "namespace " << Namespace << " {\n";
OS << "LLVM_READONLY\n";
OS << "static int getOperandType(uint16_t Opcode, uint16_t OpIdx) {\n";
// TODO: Factor out instructions with same operands to compress the tables.
// TODO: Factor out duplicate operand lists to compress the tables.
if (!NumberedInstructions.empty()) {
std::vector<int> OperandOffsets;
std::vector<Record *> OperandRecords;
@ -393,16 +393,26 @@ void InstrInfoEmitter::emitOperandTypeMappings(
}
}
// Emit the table of offsets for the opcode lookup.
OS << " const int Offsets[] = {\n";
// Emit the table of offsets (indexes) into the operand type table.
// Size the unsigned integer offset to save space.
assert(OperandRecords.size() <= UINT32_MAX &&
"Too many operands for offset table");
OS << ((OperandRecords.size() <= UINT16_MAX) ? " const uint16_t"
: " const uint32_t");
OS << " Offsets[] = {\n";
for (int I = 0, E = OperandOffsets.size(); I != E; ++I)
OS << " " << OperandOffsets[I] << ",\n";
OS << " };\n";
// Add an entry for the end so that we don't need to special case it below.
OperandOffsets.push_back(OperandRecords.size());
// Emit the actual operand types in a flat table.
OS << " const int OpcodeOperandTypes[] = {\n ";
// Size the signed integer operand type to save space.
assert(EnumVal <= INT16_MAX &&
"Too many operand types for operand types table");
OS << ((EnumVal <= INT8_MAX) ? " const int8_t" : " const int16_t");
OS << " OpcodeOperandTypes[] = {\n ";
for (int I = 0, E = OperandRecords.size(), CurOffset = 1; I != E; ++I) {
// We print each Opcode's operands in its own row.
if (I == OperandOffsets[CurOffset]) {