diff --git a/src/backend/executor/execGrouping.c b/src/backend/executor/execGrouping.c
index af6e9c42d8..5da4b37530 100644
--- a/src/backend/executor/execGrouping.c
+++ b/src/backend/executor/execGrouping.c
@@ -459,8 +459,8 @@ TupleHashTableHash_internal(struct tuplehash_hash *tb,
 		Datum		attr;
 		bool		isNull;
 
-		/* rotate hashkey left 1 bit at each step */
-		hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
+		/* combine successive hashkeys by rotating */
+		hashkey = pg_rotate_left32(hashkey, 1);
 
 		attr = slot_getattr(slot, att, &isNull);
 
diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c
index 4d68a8b97b..3510a4247c 100644
--- a/src/backend/executor/nodeHash.c
+++ b/src/backend/executor/nodeHash.c
@@ -1840,8 +1840,8 @@ ExecHashGetHashValue(HashJoinTable hashtable,
 		Datum		keyval;
 		bool		isNull;
 
-		/* rotate hashkey left 1 bit at each step */
-		hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
+		/* combine successive hashkeys by rotating */
+		hashkey = pg_rotate_left32(hashkey, 1);
 
 		/*
 		 * Get the join attribute value of the tuple
diff --git a/src/backend/executor/nodeMemoize.c b/src/backend/executor/nodeMemoize.c
index 55cdd5c4d9..23441e33ca 100644
--- a/src/backend/executor/nodeMemoize.c
+++ b/src/backend/executor/nodeMemoize.c
@@ -166,8 +166,8 @@ MemoizeHash_hash(struct memoize_hash *tb, const MemoizeKey *key)
 	{
 		for (int i = 0; i < numkeys; i++)
 		{
-			/* rotate hashkey left 1 bit at each step */
-			hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
+			/* combine successive hashkeys by rotating */
+			hashkey = pg_rotate_left32(hashkey, 1);
 
 			if (!pslot->tts_isnull[i])	/* treat nulls as having hash key 0 */
 			{
@@ -189,8 +189,8 @@ MemoizeHash_hash(struct memoize_hash *tb, const MemoizeKey *key)
 
 		for (int i = 0; i < numkeys; i++)
 		{
-			/* rotate hashkey left 1 bit at each step */
-			hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
+			/* combine successive hashkeys by rotating */
+			hashkey = pg_rotate_left32(hashkey, 1);
 
 			if (!pslot->tts_isnull[i])	/* treat nulls as having hash key 0 */
 			{
diff --git a/src/backend/utils/adt/jsonb_util.c b/src/backend/utils/adt/jsonb_util.c
index 291fb722e2..60442758b3 100644
--- a/src/backend/utils/adt/jsonb_util.c
+++ b/src/backend/utils/adt/jsonb_util.c
@@ -18,6 +18,7 @@
 #include "common/hashfn.h"
 #include "common/jsonapi.h"
 #include "miscadmin.h"
+#include "port/pg_bitutils.h"
 #include "utils/builtins.h"
 #include "utils/datetime.h"
 #include "utils/json.h"
@@ -1342,7 +1343,7 @@ JsonbHashScalarValue(const JsonbValue *scalarVal, uint32 *hash)
 	 * the previous value left 1 bit, then XOR'ing in the new
 	 * key/value/element's hash value.
 	 */
-	*hash = (*hash << 1) | (*hash >> 31);
+	*hash = pg_rotate_left32(*hash, 1);
 	*hash ^= tmp;
 }
 
diff --git a/src/backend/utils/adt/multirangetypes.c b/src/backend/utils/adt/multirangetypes.c
index 7b86421465..c474b24431 100644
--- a/src/backend/utils/adt/multirangetypes.c
+++ b/src/backend/utils/adt/multirangetypes.c
@@ -38,6 +38,7 @@
 #include "lib/stringinfo.h"
 #include "libpq/pqformat.h"
 #include "miscadmin.h"
+#include "port/pg_bitutils.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
 #include "utils/rangetypes.h"
@@ -2772,7 +2773,7 @@ hash_multirange(PG_FUNCTION_ARGS)
 		/* Merge hashes of flags and bounds */
 		range_hash = hash_uint32((uint32) flags);
 		range_hash ^= lower_hash;
-		range_hash = (range_hash << 1) | (range_hash >> 31);
+		range_hash = pg_rotate_left32(range_hash, 1);
 		range_hash ^= upper_hash;
 
 		/*
diff --git a/src/backend/utils/adt/rangetypes.c b/src/backend/utils/adt/rangetypes.c
index c3e6c721e6..cbff4e93d5 100644
--- a/src/backend/utils/adt/rangetypes.c
+++ b/src/backend/utils/adt/rangetypes.c
@@ -35,6 +35,7 @@
 #include "lib/stringinfo.h"
 #include "libpq/pqformat.h"
 #include "miscadmin.h"
+#include "port/pg_bitutils.h"
 #include "utils/builtins.h"
 #include "utils/date.h"
 #include "utils/lsyscache.h"
@@ -1363,7 +1364,7 @@ hash_range(PG_FUNCTION_ARGS)
 	/* Merge hashes of flags and bounds */
 	result = hash_uint32((uint32) flags);
 	result ^= lower_hash;
-	result = (result << 1) | (result >> 31);
+	result = pg_rotate_left32(result, 1);
 	result ^= upper_hash;
 
 	PG_RETURN_INT32(result);
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index eb83088089..ec073e1ed0 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -26,6 +26,7 @@
 #include "catalog/pg_type.h"
 #include "common/hashfn.h"
 #include "miscadmin.h"
+#include "port/pg_bitutils.h"
 #ifdef CATCACHE_STATS
 #include "storage/ipc.h"		/* for on_proc_exit */
 #endif
@@ -281,25 +282,18 @@ CatalogCacheComputeHashValue(CatCache *cache, int nkeys,
 	{
 		case 4:
 			oneHash = (cc_hashfunc[3]) (v4);
-
-			hashValue ^= oneHash << 24;
-			hashValue ^= oneHash >> 8;
+			hashValue ^= pg_rotate_left32(oneHash, 24);
 			/* FALLTHROUGH */
 		case 3:
 			oneHash = (cc_hashfunc[2]) (v3);
-
-			hashValue ^= oneHash << 16;
-			hashValue ^= oneHash >> 16;
+			hashValue ^= pg_rotate_left32(oneHash, 16);
 			/* FALLTHROUGH */
 		case 2:
 			oneHash = (cc_hashfunc[1]) (v2);
-
-			hashValue ^= oneHash << 8;
-			hashValue ^= oneHash >> 24;
+			hashValue ^= pg_rotate_left32(oneHash, 8);
 			/* FALLTHROUGH */
 		case 1:
 			oneHash = (cc_hashfunc[0]) (v1);
-
 			hashValue ^= oneHash;
 			break;
 		default:
diff --git a/src/common/hashfn.c b/src/common/hashfn.c
index b7a322073d..8779575b99 100644
--- a/src/common/hashfn.c
+++ b/src/common/hashfn.c
@@ -24,6 +24,7 @@
 #include "postgres.h"
 
 #include "common/hashfn.h"
+#include "port/pg_bitutils.h"
 
 
 /*
@@ -44,8 +45,7 @@
 /* Get a bit mask of the bits set in non-uint32 aligned addresses */
 #define UINT32_ALIGN_MASK (sizeof(uint32) - 1)
 
-/* Rotate a uint32 value left by k bits - note multiple evaluation! */
-#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
+#define rot(x,k) pg_rotate_left32(x, k)
 
 /*----------
  * mix -- mix 3 32-bit values reversibly.
diff --git a/src/include/port/pg_bitutils.h b/src/include/port/pg_bitutils.h
index 44c74fb974..04e58cd1c4 100644
--- a/src/include/port/pg_bitutils.h
+++ b/src/include/port/pg_bitutils.h
@@ -285,12 +285,18 @@ extern int	pg_popcount64(uint64 word);
 extern uint64 pg_popcount(const char *buf, int bytes);
 
 /*
- * Rotate the bits of "word" to the right by n bits.
+ * Rotate the bits of "word" to the right/left by n bits.
  */
 static inline uint32
 pg_rotate_right32(uint32 word, int n)
 {
-	return (word >> n) | (word << (sizeof(word) * BITS_PER_BYTE - n));
+	return (word >> n) | (word << (32 - n));
+}
+
+static inline uint32
+pg_rotate_left32(uint32 word, int n)
+{
+	return (word << n) | (word >> (32 - n));
 }
 
 #endif							/* PG_BITUTILS_H */