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

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=188

            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:
https://lists.freedesktop.org/archives/mesa-dev/2020-February/224144.html

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

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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