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gh-104584: Move super-instruction special-casing to generator (#106500)

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Instead of special-casing specific instructions,
we add a few more special values to the 'size' field of expansions,
so in the future we can automatically handle
additional super-instructions in the generator.
This commit is contained in:
Guido van Rossum 2023-07-07 10:42:10 -07:00 • committed by GitHub
parent 363f4f99c5
commit 11038c56ad
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 84 additions and 39 deletions
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53
Python/optimizer.c
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@ -411,44 +411,15 @@ translate_bytecode_to_trace(
for (;;) {
ADD_TO_TRACE(SAVE_IP, (int)(instr - (_Py_CODEUNIT *)code->co_code_adaptive));
int opcode = instr->op.code;
uint64_t operand = instr->op.arg;
int oparg = instr->op.arg;
int extras = 0;
while (opcode == EXTENDED_ARG) {
instr++;
extras += 1;
opcode = instr->op.code;
operand = (operand << 8) | instr->op.arg;
oparg = (oparg << 8) | instr->op.arg;
}
switch (opcode) {
case LOAD_FAST_LOAD_FAST:
case STORE_FAST_LOAD_FAST:
case STORE_FAST_STORE_FAST:
{
// Reserve space for two uops (+ SAVE_IP + EXIT_TRACE)
if (trace_length + 4 > max_length) {
DPRINTF(1, "Ran out of space for LOAD_FAST_LOAD_FAST\n");
goto done;
}
uint64_t oparg1 = operand >> 4;
uint64_t oparg2 = operand & 15;
switch (opcode) {
case LOAD_FAST_LOAD_FAST:
ADD_TO_TRACE(LOAD_FAST, oparg1);
ADD_TO_TRACE(LOAD_FAST, oparg2);
break;
case STORE_FAST_LOAD_FAST:
ADD_TO_TRACE(STORE_FAST, oparg1);
ADD_TO_TRACE(LOAD_FAST, oparg2);
break;
case STORE_FAST_STORE_FAST:
ADD_TO_TRACE(STORE_FAST, oparg1);
ADD_TO_TRACE(STORE_FAST, oparg2);
break;
default:
Py_FatalError("Missing case");
}
break;
}
default:
{
const struct opcode_macro_expansion *expansion = &_PyOpcode_macro_expansion[opcode];
@ -462,9 +433,11 @@ translate_bytecode_to_trace(
goto done;
}
for (int i = 0; i < nuops; i++) {
uint64_t operand;
int offset = expansion->uops[i].offset;
switch (expansion->uops[i].size) {
case 0:
case OPARG_FULL:
operand = oparg;
if (extras && OPCODE_HAS_JUMP(opcode)) {
if (opcode == JUMP_BACKWARD_NO_INTERRUPT) {
operand -= extras;
@ -475,19 +448,25 @@ translate_bytecode_to_trace(
}
}
break;
case 1:
case OPARG_CACHE_1:
operand = read_u16(&instr[offset].cache);
break;
case 2:
case OPARG_CACHE_2:
operand = read_u32(&instr[offset].cache);
break;
case 4:
case OPARG_CACHE_4:
operand = read_u64(&instr[offset].cache);
break;
case OPARG_TOP: // First half of super-instr
operand = oparg >> 4;
break;
case OPARG_BOTTOM: // Second half of super-instr
operand = oparg & 0xF;
break;
default:
fprintf(stderr,
"opcode=%d, operand=%" PRIu64 "; nuops=%d, i=%d; size=%d, offset=%d\n",
opcode, operand, nuops, i,
"opcode=%d, oparg=%d; nuops=%d, i=%d; size=%d, offset=%d\n",
opcode, oparg, nuops, i,
expansion->uops[i].size,
expansion->uops[i].offset);
Py_FatalError("garbled expansion");