/usr/include/clc/math/exp.h is in libclc-dev 0~git20140101-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #undef exp
// exp(x) = exp2(x * log2(e)
#define exp(val) (__clc_exp2((val) * 1.44269504f))
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