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Code Issues 1 Releases Wiki Activity

Add specialization for 3 argument get.

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This can be inlined with jmpnn instruction (jump if not nil) to
skip over the default value.

(get a b c)

can be exanded statically to

asm start:
    (get $0 $1 $2)
    (jmpnn $0 :label)
    ... Instructions to load default value to $0 - often a load.
    :label
asm end.
This commit is contained in:
Calvin Rose 2020-06-28 15:03:01 -05:00
parent 95c633914f
commit db63d352a2
1 changed files with 18 additions and 2 deletions
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20
src/core/cfuns.c
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@ -33,6 +33,11 @@ static int arity1or2(JanetFopts opts, JanetSlot *args) {
int32_t arity = janet_v_count(args);
return arity == 1 || arity == 2;
}
static int arity2or3(JanetFopts opts, JanetSlot *args) {
(void) opts;
int32_t arity = janet_v_count(args);
return arity == 2 || arity == 3;
}
static int fixarity1(JanetFopts opts, JanetSlot *args) {
(void) opts;
return janet_v_count(args) == 1;
@ -137,7 +142,18 @@ static JanetSlot do_in(JanetFopts opts, JanetSlot *args) {
return opreduce(opts, args, JOP_IN, janet_wrap_nil());
}
static JanetSlot do_get(JanetFopts opts, JanetSlot *args) {
return opreduce(opts, args, JOP_GET, janet_wrap_nil());
if (janet_v_count(args) == 3) {
JanetCompiler *c = opts.compiler;
JanetSlot t = janetc_gettarget(opts);
janetc_emit_sss(c, JOP_GET, t, args[0], args[1], 1);
int32_t label = janetc_emit_si(c, JOP_JUMP_IF_NOT_NIL, t, 0, 0);
janetc_copy(c, t, args[2]);
int32_t current = janet_v_count(c->buffer);
c->buffer[label] |= (current - label) << 16;
return t;
} else {
return opreduce(opts, args, JOP_GET, janet_wrap_nil());
}
}
static JanetSlot do_next(JanetFopts opts, JanetSlot *args) {
return opfunction(opts, args, JOP_NEXT, janet_wrap_nil());
@ -322,7 +338,7 @@ static const JanetFunOptimizer optimizers[] = {
{NULL, do_eq},
{NULL, do_neq},
{fixarity2, do_propagate},
{fixarity2, do_get},
{arity2or3, do_get},
{arity1or2, do_next},
{fixarity2, do_modulo},
{fixarity2, do_remainder},