On 1/2/13 11:37 AM, Poul-Henning Kamp wrote:
Actually, the OS is not important, floating point support is.
floating point support in the sense that the compiler supports it and
generates appropriate code to use software FP or hardware FP as available?
Or you need HW floating point for performance.
(after all, I ran floating point FORTRAN code on a 4 MHz Z80 with 48k
back in the late 70s... not speedy, but it works)
We just went through an exercise to enable the use of HW FP on our SPARC
processors for flight use. The original gcc tool chain & RTEMS setup
used software FP, even though the hardware has an FPU. But to implement
the GPS receiver, we needed HW FP, so we had to work through all those
issues. I don't recall precisely what the issues were (probably
something about saving/restoring FPU registers or, at least, not
tampering with their contents through an interrupt or library call).
The problem wasn't that GCC couldn't generate the right object code, it
was something more high level than that.
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