/usr/include/clc/math/round.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 5 6 7 8 9 | #undef round
#define round __clc_round
#define __CLC_FUNCTION __clc_round
#define __CLC_INTRINSIC "llvm.round"
#include <clc/math/unary_intrin.inc>
#undef __CLC_FUNCTION
#undef __CLC_INTRINSIC
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