Berry fix compiler bug in complex compound assignments

lib/libesp32/Berry/src/be_parser.c

@@ -900,10 +900,12 @@ static void suffix_expr(bparser *parser, bexpdesc *e)
 static void suffix_alloc_reg(bparser *parser, bexpdesc *l)
 {
     bfuncinfo *finfo = parser->finfo;
-    bbool suffix = l->type == ETINDEX || l->type == ETMEMBER;
+    bbool is_suffix = l->type == ETINDEX || l->type == ETMEMBER;   /* is suffix */
+    bbool is_suffix_reg = l->v.ss.tt == ETREG || l->v.ss.tt == ETLOCAL || l->v.ss.tt == ETGLOBAL || l->v.ss.tt == ETNGLOBAL;   /* if suffix, does it need a register */
+    bbool is_global = l->type == ETGLOBAL || l->type == ETNGLOBAL;
     /* in the suffix expression, if the object is a temporary
      * variable (l->v.ss.tt == ETREG), it needs to be cached. */
-    if (suffix && l->v.ss.tt == ETREG) {
+    if (is_global || (is_suffix && is_suffix_reg)) {
         be_code_allocregs(finfo, 1);
     }
 }

lib/libesp32/Berry/tests/compound.be

@@ -0,0 +1,19 @@
+# test bug in compound statements
+
+a = 0
+assert(a == 0)
+a += 1
+assert(a == 1)
+a += 10/2
+assert(a == 6)
+
+class A var a def init() self.a = 1 end def f(x) self.a+=x/2 end def g(x) self.a = self.a + x/2 end end
+
+a = A()
+assert(a.a == 1)
+a.f(10)
+assert(a.a == 6)
+b=A()
+assert(b.a == 1)
+b.g(10)
+assert(b.a == 6)