Implemented reduce using "identity_value", with the following requirement from the caller:
binary_op(x, identity_value) == binary_op(identity_value, x) == x, for all x.
Authored by timshen on Jan 8 2018, 4:46 PM.
timshen added a parent revision: D41843: [libcxx] implement <experimental/simd> where expressions..Jan 8 2018, 4:47 PM
timshen added a child revision: D41845: [libcxx] clean up and complete <experimental/simd>.