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d51f93d34b
A common way to implement nearbyint is by fiddling with the floating point environment and calling rint. This is used at least by the BSD libm and musl. As such, canonicalizing the latter to the former will create infinite loops for libm and generally pessimize performance, at least when the generic C versions are used. This change preserves the rint in the libcall translation and also handles the domain truncation logic, so that rint with float argument will be reduced to rintf etc. llvm-svn: 299247
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