Catalin, we'd like to support the Thecus N2100 and other XScale IOP32x
with the -iop32x kernel flavour. The N2100 has a IOP 80219 which is
ARMv5TE and like you I think it lacks a FPU.
Debian uses -mfloat-abi=soft; I understand that using -mfloat-abi=softfp
creates binaries which are compatible with Debian's, but there's a
performance hit on systems which don't have a FPU as floating point
instructions generate a kernel trap to emulate them.
Matthias, what's the current setup?
I don't mind tuning for ARMv7 at all (probably makes little difference), but
the FPU question is harder: it's a big hit for systems without a FPU to meet fp
instructions, and it's probably a comparable big win for systems with a FPU to
use fp instructions instead of full soft emulation.
Would it be possible to have two libgccs with one doing full software
emulation, and another one using the FPU? This would probably allow us to use
-mfloat-abi=soft and still benefit from the FPU to some degree on systems
having one.
** Changed in: gcc-4.3 (Ubuntu Jaunty)
Status: Incomplete => Confirmed
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armel gcc default optimisations
https://bugs.launchpad.net/bugs/303232
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