# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1434425193 21600
# Node ID 362f8fb0695bfb68196ca8961236caa8bb89d93b
# Parent  c6d2a1f54e0c182f94e6472d455d5160b0207eff
Make psh/pul error out if no registers given

While the generated object code was technically correct for bare pshs, puls,
pshu, and pulu, it was not helpful. Throw a bad operand error if no
registers are given as an operand to such instructions.

Thanks to Erik G <erik@6809.org> for reporting the problem.

diff -r c6d2a1f54e0c -r 362f8fb0695b lwasm/insn_rlist.c
--- a/lwasm/insn_rlist.c	Mon Jun 15 21:21:58 2015 -0600
+++ b/lwasm/insn_rlist.c	Mon Jun 15 21:26:33 2015 -0600
@@ -55,6 +55,8 @@
 			rn = 1 << rn;
 		rb |= rn;
 	}
+	if (rb == 0)
+		lwasm_register_error(as, l, "Bad operand");
 	l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
 	l -> pb = rb;
 }