1 files changed, 8 insertions, 0 deletions

diff --git a/log2.s b/log2.s
new file mode 100644
index 0000000..63499e6
--- /dev/null
+++ b/log2.s
@@ -0,0 +1,8 @@
+    .section    .text
+    .global     log2lzcnt
+    .type       log2lzcnt, @function
+log2lzcnt:
+    lzcnt   %rdi, %rdi
+    movq    $63,  %rax
+    sub     %rdi, %rax
+    ret