[libre-riscv-dev] [Bug 44] IEEE754 FPU inverse-sqrt

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=44

--- Comment #2 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #1)
> The "wtf" algorithm is not well suited for our needs, since Vulkan requires
> a much more accurate inv-sqrt operation than that algorithm provides
Vulkan requires an accuracy of 2 ULP (Units in the Last Place):
https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/chap40.html#spirvenv-precision-operation
search for inversesqrt

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