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Code Issues 1 Releases Wiki Activity

Fix optimization of do_get.

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When the target slot (register) is the same as the default
register, do not clobber it.
This commit is contained in:
Calvin Rose 2020-06-28 15:52:59 -05:00
parent 7209ced446
commit a1ea62a923
4 changed files with 17 additions and 4 deletions
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9
src/core/cfuns.c
View File

@ -145,9 +145,16 @@ static JanetSlot do_get(JanetFopts opts, JanetSlot *args) {
if (janet_v_count(args) == 3) {
JanetCompiler *c = opts.compiler;
JanetSlot t = janetc_gettarget(opts);
int target_is_default = janetc_sequal(t, args[2]);
JanetSlot dflt_slot = args[2];
if (target_is_default) {
dflt_slot = janetc_farslot(c);
janetc_copy(c, dflt_slot, t);
}
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]);
janetc_copy(c, t, dflt_slot);
if (target_is_default) janetc_freeslot(c, dflt_slot);
int32_t current = janet_v_count(c->buffer);
c->buffer[label] |= (current - label) << 16;
return t;

6
src/core/emit.c
View File

@ -37,7 +37,7 @@ int32_t janetc_allocfar(JanetCompiler *c) {
return reg;
}
/* Get a register less than 256 */
/* Get a register less than 256 for temporary use. */
int32_t janetc_allocnear(JanetCompiler *c, JanetcRegisterTemp tag) {
return janetc_regalloc_temp(&c->scope->ra, tag);
}
@ -205,7 +205,7 @@ static int32_t janetc_regnear(JanetCompiler *c, JanetSlot s, JanetcRegisterTemp
}
/* Check if two slots are equal */
static int janetc_sequal(JanetSlot lhs, JanetSlot rhs) {
int janetc_sequal(JanetSlot lhs, JanetSlot rhs) {
if ((lhs.flags & ~JANET_SLOTTYPE_ANY) == (rhs.flags & ~JANET_SLOTTYPE_ANY) &&
lhs.index == rhs.index &&
lhs.envindex == rhs.envindex) {
@ -245,8 +245,8 @@ void janetc_copy(
janetc_moveback(c, dest, nearreg);
/* Cleanup */
janetc_regalloc_freetemp(&c->scope->ra, nearreg, JANETC_REGTEMP_3);
}
/* Instruction templated emitters */
static int32_t emit1s(JanetCompiler *c, uint8_t op, JanetSlot s, int32_t rest, int wr) {

3
src/core/emit.h
View File

@ -42,6 +42,9 @@ int32_t janetc_emit_ssi(JanetCompiler *c, uint8_t op, JanetSlot s1, JanetSlot s2
int32_t janetc_emit_ssu(JanetCompiler *c, uint8_t op, JanetSlot s1, JanetSlot s2, uint8_t immediate, int wr);
int32_t janetc_emit_sss(JanetCompiler *c, uint8_t op, JanetSlot s1, JanetSlot s2, JanetSlot s3, int wr);
/* Check if two slots are equivalent */
int janetc_sequal(JanetSlot x, JanetSlot y);
/* Move value from one slot to another. Cannot copy to constant slots. */
void janetc_copy(JanetCompiler *c, JanetSlot dest, JanetSlot src);

3
test/suite8.janet
View File

@ -325,4 +325,7 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
(assert-no-error "issue 428 1" (loop [{:a x} :generate (fiber/new f)] (set result x)))
(assert (= result :ok) "issue 428 2")
# Inline 3 argument get
(assert (= 10 (do (var a 10) (set a (get '{} :a a)))) "inline get 1")
(end-suite)