use unsigned int's for smallhash, avoids using ABS when converting an

int from a key.

source/blender/blenlib/BLI_smallhash.h

@@ -49,9 +49,9 @@ typedef struct SmallHash {
 	SmallHashEntry _stacktable[SMSTACKSIZE];
 	SmallHashEntry _copytable[SMSTACKSIZE];
 	SmallHashEntry *stacktable, *copytable;
-	int used;
-	int curhash;
-	int size;
+	unsigned int used;
+	unsigned int curhash;
+	unsigned int size;
 } SmallHash;
 
 typedef struct {

source/blender/blenlib/intern/BLI_ghash.c

@@ -42,7 +42,7 @@
 #include "MEM_sys_types.h"  /* for intptr_t support */
 /***/
 
-unsigned int hashsizes[] = {
+const unsigned int hashsizes[] = {
 	5, 11, 17, 37, 67, 131, 257, 521, 1031, 2053, 4099, 8209, 
 	16411, 32771, 65537, 131101, 262147, 524309, 1048583, 2097169, 
 	4194319, 8388617, 16777259, 33554467, 67108879, 134217757, 

source/blender/blenlib/intern/edgehash.c

@@ -41,7 +41,7 @@
 #include "BLI_mempool.h"
 
 /**************inlined code************/
-static unsigned int _ehash_hashsizes[] = {
+static const unsigned int _ehash_hashsizes[] = {
 	1, 3, 5, 11, 17, 37, 67, 131, 257, 521, 1031, 2053, 4099, 8209,
 	16411, 32771, 65537, 131101, 262147, 524309, 1048583, 2097169,
 	4194319, 8388617, 16777259, 33554467, 67108879, 134217757,

source/blender/blenlib/intern/smallhash.c

@@ -45,23 +45,14 @@
 
 #ifdef __GNUC__
 #  pragma GCC diagnostic ignored "-Wstrict-overflow"
+#  pragma GCC diagnostic error "-Wsign-conversion"
 #endif
 
-BLI_INLINE int smhash_nonzero(const int n)
-{
-	return n + !n;
-}
-
-BLI_INLINE int smhash_abs_i(const int n)
-{
-	return (n > 0) ? n : -n;
-}
-
 /* typically this re-assigns 'h' */
 #define SMHASH_NEXT(h, hoff)  ( \
-	CHECK_TYPE_INLINE(&(h),    int), \
-	CHECK_TYPE_INLINE(&(hoff), int), \
-	smhash_abs_i((h) + (((hoff) = smhash_nonzero((hoff) * 2) + 1), (hoff))) \
+	CHECK_TYPE_INLINE(&(h),    unsigned int), \
+	CHECK_TYPE_INLINE(&(hoff), unsigned int), \
+	((h) + (((hoff) = ((hoff) * 2) + 1), (hoff))) \
 	)
 
 extern unsigned int hashsizes[];
@@ -94,10 +85,10 @@ void BLI_smallhash_release(SmallHash *hash)
 
 void BLI_smallhash_insert(SmallHash *hash, uintptr_t key, void *item)
 {
-	int h, hoff = 1;
+	unsigned int h, hoff = 1;
 
 	if (hash->size < hash->used * 3) {
-		int newsize = hashsizes[++hash->curhash];
+		unsigned int newsize = hashsizes[++hash->curhash];
 		SmallHashEntry *tmp;
 		int i = 0;
 
@@ -122,7 +113,7 @@ void BLI_smallhash_insert(SmallHash *hash, uintptr_t key, void *item)
 				continue;
 			}
 
-			h = ABS((int)(tmp[i].key));
+			h = (unsigned int)(tmp[i].key);
 			hoff = 1;
 			while (!ELEM(hash->table[h % newsize].val, SMHASH_CELL_UNUSED, SMHASH_CELL_FREE)) {
 				h = SMHASH_NEXT(h, hoff);
@@ -139,7 +130,7 @@ void BLI_smallhash_insert(SmallHash *hash, uintptr_t key, void *item)
 		}
 	}
 
-	h = ABS((int)key);
+	h = (unsigned int)(key);
 	hoff = 1;
 
 	while (!ELEM(hash->table[h % hash->size].val, SMHASH_CELL_UNUSED, SMHASH_CELL_FREE)) {
@@ -155,9 +146,9 @@ void BLI_smallhash_insert(SmallHash *hash, uintptr_t key, void *item)
 
 void BLI_smallhash_remove(SmallHash *hash, uintptr_t key)
 {
-	int h, hoff = 1;
+	unsigned int h, hoff = 1;
 
-	h = ABS((int)key);
+	h = (unsigned int)(key);
 
 	while ((hash->table[h % hash->size].key != key) ||
 	       (hash->table[h % hash->size].val == SMHASH_CELL_UNUSED))
@@ -176,10 +167,10 @@ void BLI_smallhash_remove(SmallHash *hash, uintptr_t key)
 
 void *BLI_smallhash_lookup(SmallHash *hash, uintptr_t key)
 {
-	int h, hoff = 1;
+	unsigned int h, hoff = 1;
 	void *v;
 
-	h = ABS((int)key);
+	h = (unsigned int)(key);
 
 	while ((hash->table[h % hash->size].key != key) ||
 	       (hash->table[h % hash->size].val == SMHASH_CELL_UNUSED))
@@ -202,8 +193,8 @@ void *BLI_smallhash_lookup(SmallHash *hash, uintptr_t key)
 
 int BLI_smallhash_haskey(SmallHash *hash, uintptr_t key)
 {
-	int h = ABS((int)key);
-	int hoff = 1;
+	unsigned int h = (unsigned int)(key);
+	unsigned int hoff = 1;
 
 	while ((hash->table[h % hash->size].key != key) ||
 	       (hash->table[h % hash->size].val == SMHASH_CELL_UNUSED))
@@ -220,7 +211,7 @@ int BLI_smallhash_haskey(SmallHash *hash, uintptr_t key)
 
 int BLI_smallhash_count(SmallHash *hash)
 {
-	return hash->used;
+	return (int)hash->used;
 }
 
 void *BLI_smallhash_iternext(SmallHashIter *iter, uintptr_t *key)