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slightly faster lexical variable assignment

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Fabrice Bellard
2025-12-22 15:03:43 +01:00
parent c73a435f36
commit 31ef02b907
2 changed files with 15 additions and 1 deletions
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1
quickjs-opcode.h
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@@ -168,6 +168,7 @@ DEF( set_var_ref, 3, 1, 1, var_ref) /* must come after put_var_ref */
DEF(set_loc_uninitialized, 3, 0, 0, loc)
DEF( get_loc_check, 3, 0, 1, loc)
DEF( put_loc_check, 3, 1, 0, loc) /* must come after get_loc_check */
DEF( set_loc_check, 3, 1, 1, loc) /* must come after put_loc_check */
DEF( put_loc_check_init, 3, 1, 0, loc)
DEF(get_loc_checkthis, 3, 0, 1, loc)
DEF(get_var_ref_check, 3, 0, 1, var_ref)

15
quickjs.c
View File

@@ -18346,6 +18346,18 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
sp--;
}
BREAK;
CASE(OP_set_loc_check):
{
int idx;
idx = get_u16(pc);
pc += 2;
if (unlikely(JS_IsUninitialized(var_buf[idx]))) {
JS_ThrowReferenceErrorUninitialized2(ctx, b, idx, FALSE);
goto exception;
}
set_value(ctx, &var_buf[idx], JS_DupValue(ctx, sp[-1]));
}
BREAK;
CASE(OP_put_loc_check_init):
{
int idx;
@@ -34757,7 +34769,7 @@ static __exception int resolve_labels(JSContext *ctx, JSFunctionDef *s)
/* Transformation: dup put_x(n) drop -> put_x(n) */
int op1, line2 = -1;
/* Transformation: dup put_x(n) -> set_x(n) */
if (code_match(&cc, pos_next, M3(OP_put_loc, OP_put_arg, OP_put_var_ref), -1, -1)) {
if (code_match(&cc, pos_next, M4(OP_put_loc, OP_put_loc_check, OP_put_arg, OP_put_var_ref), -1, -1)) {
if (cc.line_num >= 0) line_num = cc.line_num;
op1 = cc.op + 1; /* put_x -> set_x */
pos_next = cc.pos;
@@ -34865,6 +34877,7 @@ static __exception int resolve_labels(JSContext *ctx, JSFunctionDef *s)
goto no_change;
#endif
case OP_put_loc:
case OP_put_loc_check:
case OP_put_arg:
case OP_put_var_ref:
if (OPTIMIZE) {