[hackers] [scc] [cc2-qbe] Jump at the end in switches || Roberto E. Vargas Caballero

[git]

commit 95ac9724aaa7e8aecbfc0b354ab30a096c08ebbd
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Wed Sep 28 11:49:57 2016 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Wed Sep 28 11:49:57 2016 +0200

    [cc2-qbe] Jump at the end in switches
    
    When we arrive to the end of a switch if-else-if chain
    we have to jump to the default label. If we do not have
    default case it means that we have to jump to the end of
    the switch, but we always have to jump.

diff --git a/cc2/arch/qbe/cgen.c b/cc2/arch/qbe/cgen.c
index 1c7b8fb..39ee9ec 100644
--- a/cc2/arch/qbe/cgen.c
+++ b/cc2/arch/qbe/cgen.c
@@ -428,12 +428,12 @@ swtch_if(Node *idx)
 
                switch (np->op) {
                case OESWITCH:
-                       if (deflabel) {
-                               aux1.op = OJMP;
-                               aux1.label = NULL;
-                               aux1.u.sym = deflabel;
-                               cgen(&aux1);
-                       }
+                       if (!deflabel)
+                               deflabel = np->u.sym;
+                       aux1.op = OJMP;
+                       aux1.label = NULL;
+                       aux1.u.sym = deflabel;
+                       cgen(&aux1);
                        return;
                case OCASE:
                        aux1 = *np;