diff --git a/lib/util/math.c b/lib/util/math.c

index f2f77f7..f13b553 100644

--- a/lib/util/math.c

+++ b/lib/util/math.c

@@ -10,7 +10,7 @@

 /* The following will automatically generate several version of

  * this function, targeted at different architectures. This

  * is only supported by GCC 6 or newer. */

-#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \

+#if 0 && defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \

 	&& (defined(__i386__) || defined(__x86_64__)) \

 	&& defined(__ELF__)

 __attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))

@@ -29,7 +29,7 @@ spdk_u32log2(uint32_t x)

 /* The following will automatically generate several version of

  * this function, targeted at different architectures. This

  * is only supported by GCC 6 or newer. */

-#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \

+#if 0 && defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \

 	&& (defined(__i386__) || defined(__x86_64__)) \

 	&& defined(__ELF__)

 __attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))