* lib/bbitset.h (BITSET_WINDEX_MAX): Redefine so that it cannot be

[bison.git] / lib / bbitset.h

diff --git a/lib/bbitset.h b/lib/bbitset.h
index 878f91a46da60fec82947a1d3f97c49ca2000843..455fbbcb56a127d4a31d25923157a15c92057411 100644 (file)
--- a/lib/bbitset.h
+++ b/lib/bbitset.h
@@ -63,7 +63,10 @@ typedef size_t bitset_windex;
 /* Maximum values for commonly-used unsigned types.  BITSET_SIZE_MAX
    always equals SIZE_MAX, but some older systems lack SIZE_MAX.  */
 #define BITSET_BINDEX_MAX ((bitset_bindex) -1)
-#define BITSET_WINDEX_MAX ((bitset_windex) -1)
+
+/* Limit max word index to the maximum value of a signed integer
+   to simplify cache disabling.  */
+#define BITSET_WINDEX_MAX (((bitset_windex) -1) >> 1)
 #define BITSET_SIZE_MAX ((size_t) -1)
 
 #define BITSET_MSB ((bitset_word) 1 << (BITSET_WORD_BITS - 1))