Hi, On Monday, 2021-10-04 13:03:27 -0400, Matthew Miller wrote:
> But beyond that: What other things might be limits? Are there key bits of > the distro which don't build yet? Fwiw, I learned just yesterday that apparently to stay on the cheap side they underspecified RISC-V FPU to omit some IEEE 754 optional behaviour that would preserve and propagate a quiet NaN's payload in floating point calculations. It may or may not (optionally) be supported on a given RISC-V architecture. That is a feature LibreOffice Calc makes heavy use of to transport error information in doubles, where without those payload details it would result in just a general NaN error for illegal FP operation. Some other software may also use NaN payloads (R is mentioned in the IEEE 754 .pdf on NaNs https://grouper.ieee.org/groups/msc/ANSI_IEEE-Std-754-2019/background/nan-propagation.pdf ("Known and possible uses of NaN payloads"), and JavaScript NaN-boxing for type of data). Further pointers in https://bugs.documentfoundation.org/show_bug.cgi?id=152943 Eike -- GPG key 0x6A6CD5B765632D3A - 2265 D7F3 A7B0 95CC 3918 630B 6A6C D5B7 6563 2D3A
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