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/usr/include/clc/math/log2.h is in libclc-dev 0~git20140101-5.

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#undef log2
#define log2 __clc_log2

#define __CLC_FUNCTION __clc_log2
#define __CLC_INTRINSIC "llvm.log2"
#include <clc/math/unary_intrin.inc>