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backend: add double version of rsqrt

Graphics / Beignet - rander [intel.com] - 17 April 2017 04:08 EDT

do it by 1/sqrt. need to be refined for performance

877ab2a backend: add double version of rsqrt
backend/src/libocl/tmpl/ocl_math_common.tmpl.cl | 5 +++++
backend/src/libocl/tmpl/ocl_math_common.tmpl.h | 1 +
2 files changed, 6 insertions(+)

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