[libre-riscv-dev] [Bug 110] RISC-V FP Reciprocal (inverse) square root ISA extension needed

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=110

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
FRSQRT.S would need to be funct7=0b011100
FRSQRT.D would need to be funct7=0b011101
FRSQRT.Q would need to be funct7=0b011111
FRSQRT.H would need to be funct7=0b011110 

lower 2 bits of funct7 select the bitwidth.  upper 5 bits set the function.

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