some micro-optimizations
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8197197ced
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@ -615,13 +615,13 @@ static value_t assoc(value_t item, value_t v)
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is that a vararg lambda often needs to recur by applying itself to the
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tail of its argument list, so copying the list would be unacceptable.
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*/
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static void list(value_t *pv, int nargs, value_t *plastcdr)
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static void list(value_t *pv, uint32_t nargs, value_t *plastcdr)
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{
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cons_t *c;
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int i;
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uint32_t i;
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*pv = cons_reserve(nargs);
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c = (cons_t*)ptr(*pv);
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for(i=SP-nargs; i < (int)SP; i++) {
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for(i=SP-nargs; i < SP; i++) {
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c->car = Stack[i];
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c->cdr = tagptr(c+1, TAG_CONS);
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c++;
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@ -683,8 +683,8 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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value_t f, v, *pv, *argsyms, *body;
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cons_t *c;
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symbol_t *sym;
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uint32_t saveSP, envsz, lenv;
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int i, nargs=0, noeval=0;
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uint32_t saveSP, envsz, lenv, nargs;
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int i, noeval=0;
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fixnum_t s, lo, hi;
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cvalue_t *cv;
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int64_t accum;
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@ -700,8 +700,10 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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if (car_(v)==e) return *pv;
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v = cdr_(v); pv++;
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}
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if (v == e) return *pv; // dotted list
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if (v != NIL) pv++;
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if (v != NIL) {
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if (v == e) return *pv; // dotted list
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pv++;
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}
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if (*pv == NIL) break;
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pv = &vector_elt(*pv, 0);
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}
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@ -758,12 +760,14 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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}
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f = cdr_(f); pv++;
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}
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if (f == e) {
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*pv = v;
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SP = saveSP;
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return v;
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if (f != NIL) {
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if (f == e) {
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*pv = v;
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SP = saveSP;
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return v;
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}
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pv++;
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}
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if (f != NIL) pv++;
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if (*pv == NIL) break;
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pv = &vector_elt(*pv, 0);
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}
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@ -792,19 +796,29 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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PUSH(Stack[penv+1]); // env has already been captured; share
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}
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c = (cons_t*)ptr(v=cons_reserve(3));
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e = Stack[saveSP];
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if (!iscons(e)) goto notpair;
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c->car = LAMBDA;
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c->cdr = tagptr(c+1, TAG_CONS); c++;
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c->car = car(Stack[saveSP]); //argsyms
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c->car = car_(e); //argsyms
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c->cdr = tagptr(c+1, TAG_CONS); c++;
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c->car = car(cdr_(Stack[saveSP])); //body
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c->cdr = Stack[SP-1]; //env
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if (!iscons(e=cdr_(e))) goto notpair;
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c->car = car_(e); //body
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c->cdr = Stack[SP-1]; //env
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break;
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case F_IF:
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v = car(Stack[saveSP]);
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if (eval(v) != NIL)
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v = car(cdr_(Stack[saveSP]));
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else
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v = car(cdr(cdr_(Stack[saveSP])));
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if (!iscons(Stack[saveSP])) goto notpair;
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v = car_(Stack[saveSP]);
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if (eval(v) != NIL) {
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v = cdr_(Stack[saveSP]);
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if (!iscons(v)) goto notpair;
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v = car_(v);
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}
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else {
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v = cdr_(Stack[saveSP]);
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if (!iscons(v) || !iscons(v=cdr_(v))) goto notpair;
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v = car_(v);
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}
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tail_eval(v);
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break;
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case F_COND:
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@ -913,11 +927,15 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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break;
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case F_CAR:
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argcount("car", nargs, 1);
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v = car(Stack[SP-1]);
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v = Stack[SP-1];
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if (!iscons(v)) goto notpair;
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v = car_(v);
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break;
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case F_CDR:
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argcount("cdr", nargs, 1);
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v = cdr(Stack[SP-1]);
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v = Stack[SP-1];
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if (!iscons(v)) goto notpair;
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v = cdr_(v);
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break;
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case F_RPLACA:
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argcount("rplaca", nargs, 2);
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@ -1250,7 +1268,8 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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// apply lambda expression
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f = cdr_(f);
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PUSH(f);
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PUSH(car(f)); // arglist
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if (!iscons(f)) goto notpair;
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PUSH(car_(f)); // arglist
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argsyms = &Stack[SP-1];
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// build a calling environment for the lambda
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// the environment is the argument binds on top of the captured
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@ -1303,7 +1322,8 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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lerror(ArgError, "apply: too few arguments");
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}
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f = cdr_(Stack[saveSP+1]);
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e = car(f);
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if (!iscons(f)) goto notpair;
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e = car_(f);
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if (selfevaluating(e)) { SP=saveSP; return(e); }
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PUSH(cdr_(f)); // add closed environment
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*argsyms = car_(Stack[saveSP+1]); // put lambda list
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@ -1339,6 +1359,8 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
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// not reached
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}
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type_error("apply", "function", f);
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notpair:
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lerror(TypeError, "expected cons");
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return NIL;
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}
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@ -150,7 +150,7 @@ void raise(value_t e) __attribute__ ((__noreturn__));
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void type_error(char *fname, char *expected, value_t got) __attribute__ ((__noreturn__));
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void bounds_error(char *fname, value_t arr, value_t ind) __attribute__ ((__noreturn__));
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extern value_t ArgError, IOError, KeyError;
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static inline void argcount(char *fname, int nargs, int c)
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static inline void argcount(char *fname, uint32_t nargs, uint32_t c)
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{
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if (__unlikely(nargs != c))
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lerror(ArgError,"%s: too %s arguments", fname, nargs<c ? "few":"many");
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