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/usr/include/clc/math/round.h is in libclc-dev 0.2.0+git20180312-1.

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#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