>> usr/src/lib/libc/arch/sparc/gen/divrem.m4
> What I mean is, where can I see the code which detects whether to use
> the library code (e.g. usr/src/libc/arch/sparc/gen/divrem.m4) or
> whether do do it in hardware directly (e.g. with a udiv instruction)?

I suspect that you have to do that manually (eg, something like -mv8
when compiling).  Maybe one of the SPARC toolchain wizards can tell us?

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