RISC-V: Implement more machine-specific for libm

Kito Cheng <[email protected]>
Newsgroups gmane.comp.lib.newlib
Message-ID <[email protected]> 
This patch set has implement more machine-specific for libm with F/D extension, most can be done with one instruction, verified on rv32im, rv32imaf, rv32imafd+ilp32, rv32imafd+ilp32d, rv64im, rv64imaf, rv64gc+lp64 rv64gc+lp64d.
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