On 02/11/2011 07:08 PM, bearophile wrote:
Jim:
I rarely need to go that low-level.
Two times I have had D1 code that was too much slow compared to equivalent C
code. After profiling and some changes I have understood that the cause was an
important missing inline. With a list of the inlined functions (as done by
CommonLisp some compilers, see the enhancement request in Bugzilla), this
search becomes quicker.
My hope is that the compiler will sort this out in the end. Give it some time,
or effort to have these optimizations implemented in the compiler.
The LLVM back-end of LDC is able to inline much more, but even here a list of
inlined/not inlined functions helps. D is almost a system language, so
sometimes you need to go lower level (or you just need a program that's not too
much slow).
To me the relevant aspect is not that much practical effect, but understanding
how/why/what is inlined by (hopefully good) compilers. Learning about that,
even if not much put in practice (I don't intend to write the next big
language's compiler ;-) can only improve coding skills and, say... help and
stop shooting in the dark.
Denis
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