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Added tail-call optimization

This commit is contained in:
Devine Lu Linvega 2022-05-26 20:26:21 -07:00
parent e00e74b9d0
commit 5a0e0c56aa
1 changed files with 18 additions and 1 deletions
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19
src/uxnasm.c
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@ -45,6 +45,7 @@ typedef struct {
Program p; Program p;
static int litlast = 0; static int litlast = 0;
static int jsrlast = 0;
/* clang-format off */ /* clang-format off */
@ -199,9 +200,25 @@ writebyte(Uint8 b)
p.data[p.ptr++] = b; p.data[p.ptr++] = b;
p.length = p.ptr; p.length = p.ptr;
litlast = 0; litlast = 0;
jsrlast = 0;
return 1; return 1;
} }
static int
writeopcode(char *w)
{
Uint8 res;
if(jsrlast && scmp(w, "JMP2r", 5)) { /* combine JSR2 JMP2r */
p.data[p.ptr - 1] = findopcode("JMP2");
jsrlast = 0;
return 1;
}
res = writebyte(findopcode(w));
if(scmp(w, "JSR2", 4))
jsrlast = 1;
return res;
}
static int static int
writeshort(Uint16 s, int lit) writeshort(Uint16 s, int lit)
{ {
@ -329,7 +346,7 @@ parse(char *w, FILE *f)
default: default:
/* opcode */ /* opcode */
if(findopcode(w) || scmp(w, "BRK", 4)) { if(findopcode(w) || scmp(w, "BRK", 4)) {
if(!writebyte(findopcode(w))) return 0; if(!writeopcode(w)) return 0;
} }
/* raw byte */ /* raw byte */
else if(sihx(w) && slen(w) == 2) { else if(sihx(w) && slen(w) == 2) {