GRC3_MAXHISTORY
if (history >= (grc->history + GRC3_MAXHISTORY * 2)) \
history -= GRC3_MAXHISTORY; \
history[0] = history[-GRC3_MAXHISTORY] = (*src); \
if (history >= (grc->history + GRC3_MAXHISTORY * 2)) \
history -= GRC3_MAXHISTORY; \
history[0] = history[-GRC3_MAXHISTORY] = \
grc->historyptr = grc->history + GRC3_MAXHISTORY;
for (t = 0; t < GRC3_MAXHISTORY * 2; t++)
int32_t history[GRC3_MAXHISTORY * 2 + 1];