Problem with 64 bit FP under ARM
Tue Aug 26 13:21:35 CEST 2003
On Tue, 26 Aug 2003, Bjorn Gustavsson wrote:
> Martin Sandiford <ms@REDACTED> writes:
> > 1> <<1.0:64/float>>.
> > <<63,240,0,0,0,0,0,0>>
> > (Pretty much as expected for a little endian machine)
> This is the expected result on ANY machine.
Sorry, misspoke myself. Should be "..as expected for the beam VM"?
> It would be interesting if you could post the result of:
Eshell V5.3 (abort with ^G)
I've since found out (by reading the manuals!) that there is a
bug/feature in the ARM core < v5 in that it always stores floats in
big endian quad order. SA1110 is little endian and v4 core, so this
is where the problem is occurring.
I have a fix for erts/emulator/beam/erl_bits.c that swaps the quads
in erts_bs_(put|get)_float(), but I'm wondering if there are any other
interfaces to the outside world that might need attention?
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