Don't create code for a subtraction of zero

git-svn-id: svn://svn.cc65.org/cc65/trunk@267 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/src/cc65/codegen.c b/src/cc65/codegen.c
index 7fcb122f1fe98f50d37c24a8f9e58dbad216b1d4..4a041b4e85bfdcd6ae5c5bfc860d03c0fdb62ba5 100644 (file)
--- a/src/cc65/codegen.c
+++ b/src/cc65/codegen.c
@@ -3191,6 +3191,11 @@ void g_inc (unsigned flags, unsigned long val)
 void g_dec (unsigned flags, unsigned long val)
 /* Decrement the primary register by a given number */
 {
+    /* Don't dec by zero */
+    if (val == 0) {
+       return;
+    }
+
     /* Generate code for the supported types */
     flags &= ~CF_CONST;
     switch (flags & CF_TYPE) {