[libre-riscv-dev] [Bug 188] New: consider adding old-hardware compatibility mode to FPU

bugzilla-daemon at libre-riscv.org bugzilla-daemon at libre-riscv.org
Mon Feb 24 23:29:38 GMT 2020


            Bug ID: 188
           Summary: consider adding old-hardware compatibility mode to FPU
           Product: Libre Shakti M-Class
           Version: unspecified
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Specification
          Assignee: lkcl at lkcl.net
          Reporter: programmerjake at gmail.com
                CC: libre-riscv-dev at lists.libre-riscv.org
   NLnet milestone: ---

See thread at:

This can be done by either having a mode CSR or by using different

One particular case is where IEEE specifies that 0.0 * Infinity == NaN, old
hardware calculates the result as 0.0 * Infinity == 0.0

Note that we would probably need a new Vulkan extension to support this, since
Vulkan specifies following IEEE here (from what I recall).

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