+ /* If we have regs and the regs structure has more elements than
+ were in the pattern, set the extra elements to -1. If we
+ (re)allocated the registers, this is the case, because we
+ always allocate enough to have at least one -1 at the end.
+
+ We do this even when no_sub is set because some applications
+ (XEmacs) reuse register structures which may contain stale
+ information, and permit attempts to access those registers.
+
+ It would be possible to require the caller to do this, but we'd
+ have to change the API for this function to reflect that, and
+ audit all callers. */
+ if (regs && regs->num_regs > 0)
+ for (mcnt = num_regs; mcnt < regs->num_regs; mcnt++)
+ regs->start[mcnt] = regs->end[mcnt] = -1;
+