7c: don't emit SXTW for non-register source operand

diff --git a/sys/src/cmd/7c/txt.c b/sys/src/cmd/7c/txt.c
index 96a9eaf86776d754c685bb76417b01ffac2e8e9d..8aa7d1630d8d60ad36e4077f1a202505189f2694 100644 (file)
--- a/sys/src/cmd/7c/txt.c
+++ b/sys/src/cmd/7c/txt.c
@@ -764,7 +764,7 @@ gmove(Node *f, Node *t)
                        if(typeu[ft])
                                a = AMOVWU;
                        else
-                               a = ASXTW;
+                               a = (f->op == OREGISTER) ? ASXTW : AMOVW;
                        break;
                }
                break;