8
* regclass.c (reg_scan_mark_refs): Return immediately if passed a
NULL_RTX as an argument.
From-SVN: r22741
int note_flag;
int min_regno;
{
- register enum rtx_code code = GET_CODE (x);
+ register enum rtx_code code;
register rtx dest;
register rtx note;
+ /* This can happen when scanning insns referenced by certain notes.
+
+ It is unclear if we should be scanning such insns; until someone can
+ say for sure this seems like the safest fix. */
+ if (x == NULL_RTX)
+ return;
+
+ code = GET_CODE (x);
switch (code)
{
case CONST_INT: