--- src/blister.c.orig	2022-12-17 19:18:59.000000000 -0700
+++ src/blister.c	2023-08-10 20:07:09.650671153 -0600
@@ -840,6 +840,28 @@ void ConvBlist (
 **
 *F  COUNT_TRUES_BLOCK( <block> ) . . . . . . . . . . .  count number of trues
 */
+#ifdef __x86_64__
+static UInt __attribute__((target ("popcnt"))) fast_COUNT_TRUES_BLOCK(UInt block)
+{
+    return __builtin_popcountl(block);
+}
+
+static UInt slow_COUNT_TRUES_BLOCK(UInt block)
+{
+    return __builtin_popcountl(block);
+}
+
+static UInt (*resolve_COUNT_TRUES_BLOCK(void))(UInt block)
+{
+    __builtin_cpu_init();
+    return __builtin_cpu_supports("popcnt")
+        ? &fast_COUNT_TRUES_BLOCK
+        : &slow_COUNT_TRUES_BLOCK;
+}
+
+UInt __attribute__((ifunc ("resolve_COUNT_TRUES_BLOCK")))
+COUNT_TRUES_BLOCK(UInt block);
+#else
 UInt COUNT_TRUES_BLOCK(UInt block)
 {
 #if USE_POPCNT && defined(HAVE___BUILTIN_POPCOUNTL)
@@ -864,6 +886,7 @@ UInt COUNT_TRUES_BLOCK(UInt block)
     return block;
 #endif
 }
+#endif
 
 /****************************************************************************
 **