On 28/09/2024 10:26, Martin Frb via fpc-devel wrote:
In addition, now googled, on wikipedia there is only one format for
80bits? (unless I missed something). But it's in a paragraph referring
to x86...
https://en.wikipedia.org/wiki/Extended_precision#x86_extended_precision_format
From that any debugger on any platform seems to be able to read such a
float. So I presumed that for a given length there is a standard how the
number should be represented in memory?
I haven't tested if e.g. gdb would on a big endian be able to read an
80bit float. Or if it would just say that is an invalid size for the
platform.
Some ABIs require aligning and padding the value in memory to 16 bytes
(maybe some also to 12 bytes).
On trunk, it could be solved with packing + an align directive, although
then you'd still have to hard-code the alignment per platform using
ifdefs (or add an "alignof" intrinsic).
Jonas
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