On 2011-05-19, Peter Moylan <[email protected]> wrote:
> In the microcontroller world, the big performance hits come from the
> fact that the only available compilers are for C and sometimes C++.
> (And nobody uses assembly language except for the very little jobs.)
> The nature of the C language prevents compilers from doing optimisations
> that are standard in compilers for high-level languages. Most C
> compilers will, for example, always pass parameters on the stack,
> despite the generous supply of registers available in newer hardware.
I've been doing microcontroller stuff for 25+ years, almost all in C,
and I don't think I've never seen such a compiler. Even on the
register-starved 6800 architecture, the first parameter was passed in
a register. On architectures with more registers (H8, MSP430, ARM,
etc.) It's usually the first 3 or so parameters that are found in
registers.
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