diff --git a/basis/cpu/x86/features/features.factor b/basis/cpu/x86/features/features.factor
index 7913489178..c202b7c998 100644
--- a/basis/cpu/x86/features/features.factor
+++ b/basis/cpu/x86/features/features.factor
@@ -22,23 +22,23 @@ IN: cpu.x86.features
 
         CPUID
 
-        ECX HEX: 100000 TEST
-        "sse-42" get JNE
+        ECX 20 BT
+        "sse-42" get JB
 
-        ECX HEX: 80000 TEST
-        "sse-41" get JNE
+        ECX 19 BT
+        "sse-41" get JB
 
-        ECX HEX: 200 TEST
-        "ssse-3" get JNE
+        ECX  9 BT
+        "ssse-3" get JB
 
-        ECX HEX: 1 TEST
-        "sse-3" get JNE
+        ECX  0 BT
+        "sse-3" get JB
 
-        EDX HEX: 4000000 TEST
-        "sse-2" get JNE
+        EDX 26 BT
+        "sse-2" get JB
 
-        EDX HEX: 2000000 TEST
-        "sse-1" get JNE
+        EDX 25 BT
+        "sse-1" get JB
 
         int-regs return-reg 0 MOV
         "end" get JMP
@@ -69,6 +69,15 @@ IN: cpu.x86.features
         "end" resolve-label
     ] alien-assembly ;
 
+: (popcnt?) ( -- n )
+    int { } cdecl [
+        int-regs return-reg 1 MOV
+        CPUID
+        ECX 23 BT
+        int-regs return-reg dup XOR
+        int-regs return-reg SETB
+    ] alien-assembly ;
+
 PRIVATE>
 
 MEMO: sse-version ( -- n )
@@ -83,6 +92,8 @@ MEMO: sse-version ( -- n )
 : sse4.1? ( -- ? ) sse-version 41 >= ;
 : sse4.2? ( -- ? ) sse-version 42 >= ;
 
+: popcnt? ( -- ? ) (popcnt?) c-bool> ;
+
 : sse-string ( version -- string )
     {
         { 00 [ "no SSE" ] }