mirror of
https://github.com/janet-lang/janet
synced 2024-12-25 07:50:27 +00:00
Add recursion to the pruning optimization.
This commit is contained in:
Calvin Rose
parent
4782a76bca
commit
fcca9bbab3
@ -177,18 +177,22 @@ void janet_bytecode_remove_noops(JanetFuncDef *def) {
|
||||
* noops. Input is assumed valid bytecode. */
|
||||
void janet_bytecode_movopt(JanetFuncDef *def) {
|
||||
JanetcRegisterAllocator ra;
|
||||
janetc_regalloc_init(&ra);
|
||||
int recur = 1;
|
||||
|
||||
/* Look for slots that have writes but no reads (and aren't in the closure bitset). */
|
||||
if (def->closure_bitset != NULL) {
|
||||
for (int32_t i = 0; i < def->slotcount; i++) {
|
||||
int32_t index = i >> 5;
|
||||
uint32_t mask = 1U << (((uint32_t) i) & 31);
|
||||
if (def->closure_bitset[index] & mask) {
|
||||
janetc_regalloc_touch(&ra, i);
|
||||
/* Iterate this until no more instructions can be removed. */
|
||||
while (recur) {
|
||||
janetc_regalloc_init(&ra);
|
||||
|
||||
/* Look for slots that have writes but no reads (and aren't in the closure bitset). */
|
||||
if (def->closure_bitset != NULL) {
|
||||
for (int32_t i = 0; i < def->slotcount; i++) {
|
||||
int32_t index = i >> 5;
|
||||
uint32_t mask = 1U << (((uint32_t) i) & 31);
|
||||
if (def->closure_bitset[index] & mask) {
|
||||
janetc_regalloc_touch(&ra, i);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define AA ((instr >> 8) & 0xFF)
|
||||
#define BB ((instr >> 16) & 0xFF)
|
||||
@ -196,188 +200,193 @@ void janet_bytecode_movopt(JanetFuncDef *def) {
|
||||
#define DD (instr >> 8)
|
||||
#define EE (instr >> 16)
|
||||
|
||||
/* Check reads and writes */
|
||||
for (int32_t i = 0; i < def->bytecode_length; i++) {
|
||||
uint32_t instr = def->bytecode[i];
|
||||
switch (instr & 0x7F) {
|
||||
/* Check reads and writes */
|
||||
for (int32_t i = 0; i < def->bytecode_length; i++) {
|
||||
uint32_t instr = def->bytecode[i];
|
||||
switch (instr & 0x7F) {
|
||||
|
||||
/* Group instructions my how they read from slots */
|
||||
/* Group instructions my how they read from slots */
|
||||
|
||||
/* No reads or writes */
|
||||
default:
|
||||
janet_assert(0, "unhandled instruction");
|
||||
case JOP_JUMP:
|
||||
case JOP_NOOP:
|
||||
case JOP_RETURN_NIL:
|
||||
/* Write A */
|
||||
case JOP_LOAD_INTEGER:
|
||||
case JOP_LOAD_CONSTANT:
|
||||
case JOP_LOAD_UPVALUE:
|
||||
case JOP_CLOSURE:
|
||||
/* Write D */
|
||||
case JOP_LOAD_NIL:
|
||||
case JOP_LOAD_TRUE:
|
||||
case JOP_LOAD_FALSE:
|
||||
case JOP_LOAD_SELF:
|
||||
case JOP_MAKE_ARRAY:
|
||||
case JOP_MAKE_BUFFER:
|
||||
case JOP_MAKE_STRING:
|
||||
case JOP_MAKE_STRUCT:
|
||||
case JOP_MAKE_TABLE:
|
||||
case JOP_MAKE_TUPLE:
|
||||
case JOP_MAKE_BRACKET_TUPLE:
|
||||
break;
|
||||
/* No reads or writes */
|
||||
default:
|
||||
janet_assert(0, "unhandled instruction");
|
||||
case JOP_JUMP:
|
||||
case JOP_NOOP:
|
||||
case JOP_RETURN_NIL:
|
||||
/* Write A */
|
||||
case JOP_LOAD_INTEGER:
|
||||
case JOP_LOAD_CONSTANT:
|
||||
case JOP_LOAD_UPVALUE:
|
||||
case JOP_CLOSURE:
|
||||
/* Write D */
|
||||
case JOP_LOAD_NIL:
|
||||
case JOP_LOAD_TRUE:
|
||||
case JOP_LOAD_FALSE:
|
||||
case JOP_LOAD_SELF:
|
||||
case JOP_MAKE_ARRAY:
|
||||
case JOP_MAKE_BUFFER:
|
||||
case JOP_MAKE_STRING:
|
||||
case JOP_MAKE_STRUCT:
|
||||
case JOP_MAKE_TABLE:
|
||||
case JOP_MAKE_TUPLE:
|
||||
case JOP_MAKE_BRACKET_TUPLE:
|
||||
break;
|
||||
|
||||
/* Read A */
|
||||
case JOP_ERROR:
|
||||
case JOP_TYPECHECK:
|
||||
case JOP_JUMP_IF:
|
||||
case JOP_JUMP_IF_NOT:
|
||||
case JOP_JUMP_IF_NIL:
|
||||
case JOP_JUMP_IF_NOT_NIL:
|
||||
case JOP_SET_UPVALUE:
|
||||
/* Write E, Read A */
|
||||
case JOP_MOVE_FAR:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
break;
|
||||
/* Read A */
|
||||
case JOP_ERROR:
|
||||
case JOP_TYPECHECK:
|
||||
case JOP_JUMP_IF:
|
||||
case JOP_JUMP_IF_NOT:
|
||||
case JOP_JUMP_IF_NIL:
|
||||
case JOP_JUMP_IF_NOT_NIL:
|
||||
case JOP_SET_UPVALUE:
|
||||
/* Write E, Read A */
|
||||
case JOP_MOVE_FAR:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
break;
|
||||
|
||||
/* Read B */
|
||||
case JOP_SIGNAL:
|
||||
/* Write A, Read B */
|
||||
case JOP_ADD_IMMEDIATE:
|
||||
case JOP_MULTIPLY_IMMEDIATE:
|
||||
case JOP_DIVIDE_IMMEDIATE:
|
||||
case JOP_SHIFT_LEFT_IMMEDIATE:
|
||||
case JOP_SHIFT_RIGHT_IMMEDIATE:
|
||||
case JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE:
|
||||
case JOP_GREATER_THAN_IMMEDIATE:
|
||||
case JOP_LESS_THAN_IMMEDIATE:
|
||||
case JOP_EQUALS_IMMEDIATE:
|
||||
case JOP_NOT_EQUALS_IMMEDIATE:
|
||||
case JOP_GET_INDEX:
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
break;
|
||||
/* Read B */
|
||||
case JOP_SIGNAL:
|
||||
/* Write A, Read B */
|
||||
case JOP_ADD_IMMEDIATE:
|
||||
case JOP_MULTIPLY_IMMEDIATE:
|
||||
case JOP_DIVIDE_IMMEDIATE:
|
||||
case JOP_SHIFT_LEFT_IMMEDIATE:
|
||||
case JOP_SHIFT_RIGHT_IMMEDIATE:
|
||||
case JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE:
|
||||
case JOP_GREATER_THAN_IMMEDIATE:
|
||||
case JOP_LESS_THAN_IMMEDIATE:
|
||||
case JOP_EQUALS_IMMEDIATE:
|
||||
case JOP_NOT_EQUALS_IMMEDIATE:
|
||||
case JOP_GET_INDEX:
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
break;
|
||||
|
||||
/* Read D */
|
||||
case JOP_RETURN:
|
||||
case JOP_PUSH:
|
||||
case JOP_PUSH_ARRAY:
|
||||
case JOP_TAILCALL:
|
||||
janetc_regalloc_touch(&ra, DD);
|
||||
break;
|
||||
/* Read D */
|
||||
case JOP_RETURN:
|
||||
case JOP_PUSH:
|
||||
case JOP_PUSH_ARRAY:
|
||||
case JOP_TAILCALL:
|
||||
janetc_regalloc_touch(&ra, DD);
|
||||
break;
|
||||
|
||||
/* Write A, Read E */
|
||||
case JOP_MOVE_NEAR:
|
||||
case JOP_LENGTH:
|
||||
case JOP_BNOT:
|
||||
case JOP_CALL:
|
||||
janetc_regalloc_touch(&ra, EE);
|
||||
break;
|
||||
/* Write A, Read E */
|
||||
case JOP_MOVE_NEAR:
|
||||
case JOP_LENGTH:
|
||||
case JOP_BNOT:
|
||||
case JOP_CALL:
|
||||
janetc_regalloc_touch(&ra, EE);
|
||||
break;
|
||||
|
||||
/* Read A, B */
|
||||
case JOP_PUT_INDEX:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
break;
|
||||
/* Read A, B */
|
||||
case JOP_PUT_INDEX:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
break;
|
||||
|
||||
/* Read A, E */
|
||||
case JOP_PUSH_2:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, EE);
|
||||
break;
|
||||
/* Read A, E */
|
||||
case JOP_PUSH_2:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, EE);
|
||||
break;
|
||||
|
||||
/* Read B, C */
|
||||
case JOP_PROPAGATE:
|
||||
/* Write A, Read B and C */
|
||||
case JOP_BAND:
|
||||
case JOP_BOR:
|
||||
case JOP_BXOR:
|
||||
case JOP_ADD:
|
||||
case JOP_SUBTRACT:
|
||||
case JOP_MULTIPLY:
|
||||
case JOP_DIVIDE:
|
||||
case JOP_MODULO:
|
||||
case JOP_REMAINDER:
|
||||
case JOP_SHIFT_LEFT:
|
||||
case JOP_SHIFT_RIGHT:
|
||||
case JOP_SHIFT_RIGHT_UNSIGNED:
|
||||
case JOP_GREATER_THAN:
|
||||
case JOP_LESS_THAN:
|
||||
case JOP_EQUALS:
|
||||
case JOP_COMPARE:
|
||||
case JOP_IN:
|
||||
case JOP_GET:
|
||||
case JOP_GREATER_THAN_EQUAL:
|
||||
case JOP_LESS_THAN_EQUAL:
|
||||
case JOP_NOT_EQUALS:
|
||||
case JOP_CANCEL:
|
||||
case JOP_RESUME:
|
||||
case JOP_NEXT:
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
janetc_regalloc_touch(&ra, CC);
|
||||
break;
|
||||
/* Read B, C */
|
||||
case JOP_PROPAGATE:
|
||||
/* Write A, Read B and C */
|
||||
case JOP_BAND:
|
||||
case JOP_BOR:
|
||||
case JOP_BXOR:
|
||||
case JOP_ADD:
|
||||
case JOP_SUBTRACT:
|
||||
case JOP_MULTIPLY:
|
||||
case JOP_DIVIDE:
|
||||
case JOP_MODULO:
|
||||
case JOP_REMAINDER:
|
||||
case JOP_SHIFT_LEFT:
|
||||
case JOP_SHIFT_RIGHT:
|
||||
case JOP_SHIFT_RIGHT_UNSIGNED:
|
||||
case JOP_GREATER_THAN:
|
||||
case JOP_LESS_THAN:
|
||||
case JOP_EQUALS:
|
||||
case JOP_COMPARE:
|
||||
case JOP_IN:
|
||||
case JOP_GET:
|
||||
case JOP_GREATER_THAN_EQUAL:
|
||||
case JOP_LESS_THAN_EQUAL:
|
||||
case JOP_NOT_EQUALS:
|
||||
case JOP_CANCEL:
|
||||
case JOP_RESUME:
|
||||
case JOP_NEXT:
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
janetc_regalloc_touch(&ra, CC);
|
||||
break;
|
||||
|
||||
/* Read A, B, C */
|
||||
case JOP_PUT:
|
||||
case JOP_PUSH_3:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
janetc_regalloc_touch(&ra, CC);
|
||||
break;
|
||||
/* Read A, B, C */
|
||||
case JOP_PUT:
|
||||
case JOP_PUSH_3:
|
||||
janetc_regalloc_touch(&ra, AA);
|
||||
janetc_regalloc_touch(&ra, BB);
|
||||
janetc_regalloc_touch(&ra, CC);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Iterate and set noops on instructions that make writes that no one ever reads.
|
||||
* Only set noops for instructions with no side effects - moves, loads, etc. that can't
|
||||
* raise errors (outside of systemic errors like oom or stack overflow). */
|
||||
for (int32_t i = 0; i < def->bytecode_length; i++) {
|
||||
uint32_t instr = def->bytecode[i];
|
||||
switch (instr & 0x7F) {
|
||||
default:
|
||||
/* Iterate and set noops on instructions that make writes that no one ever reads.
|
||||
* Only set noops for instructions with no side effects - moves, loads, etc. that can't
|
||||
* raise errors (outside of systemic errors like oom or stack overflow). */
|
||||
recur = 0;
|
||||
for (int32_t i = 0; i < def->bytecode_length; i++) {
|
||||
uint32_t instr = def->bytecode[i];
|
||||
switch (instr & 0x7F) {
|
||||
default:
|
||||
break;
|
||||
/* Write D */
|
||||
case JOP_LOAD_NIL:
|
||||
case JOP_LOAD_TRUE:
|
||||
case JOP_LOAD_FALSE:
|
||||
case JOP_LOAD_SELF:
|
||||
case JOP_MAKE_ARRAY:
|
||||
case JOP_MAKE_TUPLE:
|
||||
case JOP_MAKE_BRACKET_TUPLE: {
|
||||
if (!janetc_regalloc_check(&ra, DD)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
recur = 1;
|
||||
}
|
||||
}
|
||||
break;
|
||||
/* Write D */
|
||||
case JOP_LOAD_NIL:
|
||||
case JOP_LOAD_TRUE:
|
||||
case JOP_LOAD_FALSE:
|
||||
case JOP_LOAD_SELF:
|
||||
case JOP_MAKE_ARRAY:
|
||||
case JOP_MAKE_TUPLE:
|
||||
case JOP_MAKE_BRACKET_TUPLE: {
|
||||
if (!janetc_regalloc_check(&ra, DD)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
/* Write E, Read A */
|
||||
case JOP_MOVE_FAR: {
|
||||
if (!janetc_regalloc_check(&ra, EE)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
recur = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
/* Write E, Read A */
|
||||
case JOP_MOVE_FAR: {
|
||||
if (!janetc_regalloc_check(&ra, EE)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
break;
|
||||
/* Write A, Read E */
|
||||
case JOP_MOVE_NEAR:
|
||||
/* Write A, Read B */
|
||||
case JOP_GET_INDEX:
|
||||
/* Write A */
|
||||
case JOP_LOAD_INTEGER:
|
||||
case JOP_LOAD_CONSTANT:
|
||||
case JOP_LOAD_UPVALUE:
|
||||
case JOP_CLOSURE: {
|
||||
if (!janetc_regalloc_check(&ra, AA)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
recur = 1;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
break;
|
||||
/* Write A, Read E */
|
||||
case JOP_MOVE_NEAR:
|
||||
/* Write A, Read B */
|
||||
case JOP_GET_INDEX:
|
||||
/* Write A */
|
||||
case JOP_LOAD_INTEGER:
|
||||
case JOP_LOAD_CONSTANT:
|
||||
case JOP_LOAD_UPVALUE:
|
||||
case JOP_CLOSURE: {
|
||||
if (!janetc_regalloc_check(&ra, AA)) {
|
||||
def->bytecode[i] = JOP_NOOP;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
janetc_regalloc_deinit(&ra);
|
||||
janetc_regalloc_deinit(&ra);
|
||||
#undef AA
|
||||
#undef BB
|
||||
#undef CC
|
||||
#undef DD
|
||||
#undef EE
|
||||
}
|
||||
}
|
||||
|
||||
/* Verify some bytecode */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user