which is better (both are corect)

test-cmp-i.nqp

#!/usr/bin/env nqp-m

my int $i := 0;
sub foo (int $x) {
    if (nqp::cmp_i($x, 50) > 0) {
       nqp::say("$x: OH HAI");
    } else {
       nqp::say("$x: OH NOES");
    }
}

while $i < 100 {
      $i := $i + 1;
      foo($i);
      foo(100 - $i);
}

which-is-better.diff

diff --git a/3rdparty/dynasm b/3rdparty/dynasm
--- a/3rdparty/dynasm
+++ b/3rdparty/dynasm
@@ -1 +1 @@
-Subproject commit 12ace5e3a50238f69a3616e65b3e9ca188c41ac5
+Subproject commit 12ace5e3a50238f69a3616e65b3e9ca188c41ac5-dirty
diff --git a/src/jit/emit_x64.dasc b/src/jit/emit_x64.dasc
index 7afbb12..eb596ac 100644
--- a/src/jit/emit_x64.dasc
+++ b/src/jit/emit_x64.dasc
@@ -807,11 +807,10 @@ void MVM_jit_emit_primitive(MVMThreadContext *tc, MVMJitGraph *jg,
         /* copy the right comparison bit to the lower byte of the rax
            register */
         | setg TMP2b;
-        | movzx TMP2, TMP2b;
         | setl TMP3b;
-        | movzx TMP3, TMP3b;
-        | sub TMP2, TMP3;
-        | mov WORK[reg_a], TMP2;
+        | sub TMP2b, TMP3b;
+        | movsx TMP2, TMP2b;
+        | mov qword WORK[reg_a], TMP2;
         break;
     }
     case MVM_OP_not_i: {