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dropping needless drops

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This commit is contained in:
Alex Shinn 2011-07-04 23:07:19 +09:00
parent 463400fc7e
commit 0de463a7c4
1 changed files with 23 additions and 22 deletions
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45
vm.c
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@ -104,7 +104,13 @@ static void generate_seq (sexp ctx, sexp name, sexp loc, sexp lam, sexp app) {
for ( ; sexp_pairp(tail); head=tail, tail=sexp_cdr(tail))
if (sexp_pointerp(sexp_car(head)) && (! sexp_litp(sexp_car(head)))) {
generate(ctx, name, loc, lam, sexp_car(head));
emit(ctx, SEXP_OP_DROP);
if ((sexp_pairp(sexp_car(head)) && sexp_opcodep(sexp_caar(head))
&& sexp_opcode_return_type(sexp_caar(head)) == SEXP_VOID
&& sexp_opcode_class(sexp_caar(head)) != SEXP_OPC_FOREIGN)
|| sexp_setp(sexp_car(head)))
sexp_context_pos(ctx) -= 1 + sizeof(sexp);
else
emit(ctx, SEXP_OP_DROP);
sexp_context_depth(ctx)--;
}
sexp_context_tailp(ctx) = tailp;
@ -195,6 +201,7 @@ static void generate_set (sexp ctx, sexp set) {
emit_word(ctx, sexp_param_index(lambda, sexp_ref_name(ref)));
}
}
emit_push(ctx, SEXP_VOID);
sexp_context_depth(ctx)--;
}
@ -322,6 +329,7 @@ static void generate_opcode_app (sexp ctx, sexp app) {
emit_push(ctx, sexp_opcode_data(op));
#endif
emit(ctx, ((num_args == 0) ? SEXP_OP_CDR : SEXP_OP_SET_CDR));
if (num_args > 0) emit_push(ctx, SEXP_VOID);
break;
default:
emit(ctx, sexp_opcode_code(op));
@ -333,6 +341,10 @@ static void generate_opcode_app (sexp ctx, sexp app) {
sexp_lit_value(sexp_car(ls)) :
sexp_car(ls)));
if (sexp_opcodep(op) && sexp_opcode_return_type(op) == SEXP_VOID
&& sexp_opcode_class(op) != SEXP_OPC_FOREIGN)
emit_push(ctx, SEXP_VOID);
sexp_context_depth(ctx) -= (num_args-1);
sexp_gc_release1(ctx);
}
@ -380,7 +392,6 @@ static void generate_tail_jump (sexp ctx, sexp name, sexp loc, sexp lam, sexp ap
for (ls1=ls3; sexp_pairp(ls1); ls1=sexp_cdr(ls1)) {
emit(ctx, SEXP_OP_LOCAL_SET);
emit_word(ctx, sexp_param_index(lam, sexp_car(ls1)));
emit(ctx, SEXP_OP_DROP);
}
/* jump */
@ -432,7 +443,6 @@ static void generate_lambda (sexp ctx, sexp name, sexp loc, sexp lam, sexp lambd
emit(ctx2, SEXP_OP_CONS);
emit(ctx2, SEXP_OP_LOCAL_SET);
emit_word(ctx2, k);
emit(ctx2, SEXP_OP_DROP);
}
}
sexp_context_tailp(ctx2) = 1;
@ -465,7 +475,6 @@ static void generate_lambda (sexp ctx, sexp name, sexp loc, sexp lam, sexp lambd
emit(ctx, SEXP_OP_STACK_REF);
emit_word(ctx, 3);
emit(ctx, SEXP_OP_VECTOR_SET);
emit(ctx, SEXP_OP_DROP);
sexp_context_depth(ctx)--;
}
/* push the additional procedure info and make the closure */
@ -597,6 +606,7 @@ static sexp sexp_restore_stack (sexp ctx, sexp saved) {
#define _ARG5 stack[top-5]
#define _ARG6 stack[top-6]
#define _PUSH(x) (stack[top++]=(x))
#define _POP() (stack[--top])
#if SEXP_USE_ALIGNED_BYTECODE
#define _ALIGN_IP() ip = (unsigned char *)sexp_word_align((sexp_uint_t)ip)
@ -1012,8 +1022,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
break;
case SEXP_OP_LOCAL_SET:
_ALIGN_IP();
stack[fp - 1 - _SWORD0] = _ARG1;
_ARG1 = SEXP_VOID;
stack[fp - 1 - _SWORD0] = _POP();
ip += sizeof(sexp);
break;
case SEXP_OP_CLOSURE_REF:
@ -1043,8 +1052,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
if ((i < 0) || (i >= sexp_vector_length(_ARG1)))
sexp_raise("vector-set!: index out of range", sexp_list2(ctx, _ARG1, _ARG2));
sexp_vector_set(_ARG1, _ARG2, _ARG3);
_ARG3 = SEXP_VOID;
top-=2;
top-=3;
break;
case SEXP_OP_VECTOR_LENGTH:
if (! sexp_vectorp(_ARG1))
@ -1097,8 +1105,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
#else
sexp_string_set(_ARG1, _ARG2, _ARG3);
#endif
_ARG3 = SEXP_VOID;
top-=2;
top-=3;
break;
#if SEXP_USE_UTF8_STRINGS
case SEXP_OP_STRING_CURSOR_NEXT:
@ -1204,9 +1211,8 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else if (sexp_immutablep(_ARG1))
sexp_raise("slot-set!: immutable object", sexp_list1(ctx, _ARG1));
sexp_slot_set(_ARG1, _UWORD1, _ARG2);
_ARG2 = SEXP_VOID;
ip += sizeof(sexp)*2;
top--;
top-=2;
break;
case SEXP_OP_SLOTN_REF:
if (! sexp_typep(_ARG1))
@ -1228,8 +1234,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else if (! sexp_fixnump(_ARG3))
sexp_raise("slot-set!: not an integer", sexp_list1(ctx, _ARG3));
sexp_slot_set(_ARG2, sexp_unbox_fixnum(_ARG3), _ARG4);
_ARG4 = SEXP_VOID;
top-=3;
top-=4;
break;
case SEXP_OP_CAR:
if (! sexp_pairp(_ARG1))
@ -1245,8 +1250,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else if (sexp_immutablep(_ARG1))
sexp_raise("set-car!: immutable pair", sexp_list1(ctx, _ARG1));
sexp_car(_ARG1) = _ARG2;
_ARG2 = SEXP_VOID;
top--;
top-=2;
break;
case SEXP_OP_SET_CDR:
if (! sexp_pairp(_ARG1))
@ -1254,8 +1258,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else if (sexp_immutablep(_ARG1))
sexp_raise("set-cdr!: immutable pair", sexp_list1(ctx, _ARG1));
sexp_cdr(_ARG1) = _ARG2;
_ARG2 = SEXP_VOID;
top--;
top-=2;
break;
case SEXP_OP_CONS:
sexp_context_top(ctx) = top;
@ -1560,15 +1563,14 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else
#endif
sexp_write_char(ctx, sexp_unbox_character(_ARG1), _ARG2);
_ARG2 = SEXP_VOID;
top--;
top-=2;
break;
case SEXP_OP_NEWLINE:
if (! sexp_oportp(_ARG1))
sexp_raise("newline: not an output-port", sexp_list1(ctx, _ARG1));
sexp_context_top(ctx) = top;
sexp_newline(ctx, _ARG1);
_ARG1 = SEXP_VOID;
top--;
break;
case SEXP_OP_READ_CHAR:
if (! sexp_iportp(_ARG1))
@ -1618,7 +1620,6 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
#if SEXP_USE_GREEN_THREADS
fuel = 0;
#endif
_PUSH(SEXP_VOID);
break;
case SEXP_OP_FORCE:
#if SEXP_USE_AUTO_FORCE