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--- a/src/chealpix.c
+++ b/src/chealpix.c
@@ -532,7 +532,6 @@
     return (long) res;
 }
 
-#ifndef __BMI2__
 static int64_t spread_bits64(int v) {
     return (int64_t) (utab[v & 0xff])
             | ((int64_t) (utab[(v >> 8) & 0xff]) << 16)
@@ -548,6 +547,7 @@
             | (ctab[(raw >> 40) & 0xff] << 20);
 }
 
+#ifndef __BMI2__
 static int64_t xyf2nest64(int64_t nside, int ix, int iy, int face_num) {
     return (face_num * nside * nside) + spread_bits64(ix)
             + (spread_bits64(iy) << 1);