[Libre-soc-isa] [Bug 923] we missed some important fp ops

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu Sep 8 08:58:40 BST 2022


--- Comment #1 from Jacob Lifshay <programmerjake at gmail.com> ---
technically there's also x86's maxss operations, they implement the C function:
float f(float a, float b) {
    return a < b ? a : b;
specifically if either input is a NaN or if both inputs are equal or if both
inputs are zero of either sign they always return b. They never convert a
signalling NaN to a quiet Nan.

If we also add that, it would fill out the min/max/minmag/maxmag variants to 8,
fitting nicely in a 3-bit mode field. or if we decide we don't want
minmag/maxmag, it would fill out the variants to 4, fitting in a 2-bit mode

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