shithub: scc

ref: da3fdf4fee4a266d3e69ea569659cb0268cb7d28
dir: /cc2.old/cast.patch/

diff --git a/cc2/cgen.c b/cc2/cgen.c
index be4ff41..8839505 100644
--- a/cc2/cgen.c
+++ b/cc2/cgen.c
@@ -449,16 +449,50 @@ cast(Node *np)
 {
 	Node *lp = np->left;
 	uint8_t reg;
+	int8_t delta;
 
-	if (lp->type.size != np->type.size)
+	swtich (lp->type.size) {
+	case 1:
+		switch (np->type.size) {
+		case 1:
+			break;
+		case 2:
+			if (lp->op != REG)
+				move(lp, np);
+			np->reg = reg = lp->reg;
+			if (lp->sign && np->sign) {
+				code(BIT, lp, imm(7));
+				code(JRZ, .., ..);
+				code(LDI, regs[upper[reg]], imm(-1));
+				code(JR, ..., ...);
+			}
+			reguse[pair[reg]] = reguse[reg] = np;
+			code(LDI, regs[lower[reg]], imm(0));
+			break;
+		default:
+			abort();
+		}
+		break;
+	case 2:
+		switch (np->type.size) {
+		case 1:
+			if (lp->op == REG) {
+				reguse[upper[reg]] = NULL;
+				reg = lower[reg];
+				np->reg = reg;
+				reguse[pair[reg]] = reguse[reg] = np;
+			}
+			break;
+		case 2:
+			break;
+		default:
+			abort();
+		}
+	default:
 		abort();
+	}
 	lp->used = 1;
 	np->sym = lp->sym;
-	if ((np->op = lp->op) == REG) {
-		reg = lp->reg;
-		np->reg = reg;
-		reguse[pair[reg]] = reguse[reg] = np;
-	}
 }
 
 static void (*opnodes[])(Node *) = {