Fix #2299 by handling very large value cases correctly

src/big_int.cpp

@@ -561,6 +561,28 @@ gb_internal String big_int_to_string(gbAllocator allocator, BigInt const *x, u64
 	Array<char> buf = {};
 	array_init(&buf, allocator, 0, 32);
 
+	if (x->used >= 498) { // 2^498 ~ 10^150
+		mp_int val = {};
+		mp_abs(x, &val);
+		int exp = 0;
+		mp_err err = mp_log_n(&val, 10, &exp);
+		GB_ASSERT(err == MP_OKAY);
+		GB_ASSERT(exp >= 100);
+
+		mp_int thousand_below = {};
+		mp_int thousand_above = {};
+		mp_init_i32(&thousand_below, 10);
+
+		mp_expt_n(&thousand_below, exp-3, &thousand_below);
+		mp_div(&val, &thousand_below, &thousand_above, nullptr);
+
+		double mant = 1.0e-3 * mp_get_double(&thousand_above);
+
+		char val_buf[256] = {};
+		isize n = gb_snprintf(val_buf, gb_size_of(val_buf)-1, "~ %s%.fe%u", (x->sign ? "-" : ""), mant, exp);
+
+		array_add_elems(&buf, val_buf, n-1);
+	} else {
 		BigInt v = {};
 		mp_init_copy(&v, x);
 
@@ -596,5 +618,6 @@ gb_internal String big_int_to_string(gbAllocator allocator, BigInt const *x, u64
 			buf[j] = tmp;
 		}
 
+	}
 	return make_string(cast(u8 *)buf.data, buf.count);
 }

src/llvm_backend_stmt.cpp

@@ -2321,7 +2321,7 @@ gb_internal void lb_emit_defer_stmts(lbProcedure *p, lbDeferExitKind kind, lbBlo
 
 		if (kind == lbDeferExit_Default) {
 			if (p->scope_index == d.scope_index &&
-			    d.scope_index > 0) { // TODO(bill): Which is correct: > 0 or > 1?
+			    d.scope_index > 0) {
 				lb_build_defer_stmt(p, d);
 				array_pop(&p->defer_stmts);
 				continue;