Fixed a bug

git-svn-id: svn://svn.cc65.org/cc65/trunk@1717 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/src/cc65/coptstop.c b/src/cc65/coptstop.c
index 2a479ed41dfe3185c9433e26bf08ac28ebc26091..5a512cb206c202348dae6d746da32fce0e384dda 100644 (file)
--- a/src/cc65/coptstop.c
+++ b/src/cc65/coptstop.c
@@ -711,8 +711,16 @@ unsigned OptStackOps (CodeSeg* S)
        /* Handling depends if we're inside a sequence or not */
        if (InSeq) {
 
-                   if (((E->Use & REG_SP) != 0 &&
-                (E->AM != AM65_ZP_INDY || RegValIsUnknown (E->RI->In.RegY)))) {
+            /* If we are using the stack, and we don't have "indirect Y"
+             * addressing mode, or the value of Y is unknown, or less than
+             * two, we cannot cope with this piece of code. Having an unknown
+             * value of Y means that we cannot correct the stack offset, while
+             * having an offset less than two means that the code works with
+             * the value on stack which is to be removed.
+             */
+                   if ((E->Use & REG_SP) != 0 &&
+               (E->AM != AM65_ZP_INDY || RegValIsUnknown (E->RI->In.RegY) ||
+                 E->RI->In.RegY < 2)) {
 
                /* All this stuff is not allowed in a sequence */
                InSeq = 0;