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[avr-gcc-list] FW: [PATCH 4.5 0/N]: Integrate GCC with the complex math
From: |
Weddington, Eric |
Subject: |
[avr-gcc-list] FW: [PATCH 4.5 0/N]: Integrate GCC with the complex math library MPC |
Date: |
Sun, 15 Mar 2009 10:21:13 -0600 |
To all AVR GCC maintainers and distribution builders,
The post below just came across the gcc-patches mailing list. AFAIK, these
patches will be going into gcc future 4.5. The MPC package that it refers to
will probably become a required prerequisite package some time in the future,
like GMP and MPFR.
Also, how can AVR GCC take advantage of this in the future?
Eric Weddington
> -----Original Message-----
> From: Kaveh R. GHAZI [mailto:address@hidden
> Sent: Sunday, March 15, 2009 10:10 AM
> To: address@hidden
> Subject: [PATCH 4.5 0/N]: Integrate GCC with the complex math
> library MPC
>
> This series of patches integrates GCC with the complex math
> library MPC.
> MPC is the complex analogue to MPFR. It is written by some
> of the same
> folks with the same accuracy and precision principles. MPC
> is licensed
> under the LGPL. See: http://www.multiprecision.org/mpc/
>
> Among the potential benefits of using MPC are:
>
> 1. Folding of complex builtins with constant arguments in the
> middle-end, e.g. csin(a + bI) -> c + dI. Of course complex
> builtins may not start out with a constant argument, but various
> optimizations may infer what the argument is and allow the folding
> to occur.
>
> 2. Folding of fortran intrinsics. (These optimizations don't go
> through the middle-end and so right now have duplicate
> functionality).
>
> 3. Addressing complex folding bugs like PR30789 that can be tricky
> to fix (even with MPFR).
>
>
> MPC is currently under 0.x version development and is not entirely
> complete with respect to c99 complex builtins yet (but their
> plan is to do
> all of the c99 math functions with c99 semantics for the
> special cases.)
> Also as far as I'm aware, MPC is not yet included with
> distros or binary
> sites like MPFR is.
>
> Because of these issues, I have written the patch to make MPC's use
> *optional* for now. So GCC developers without MPC should not notice
> anything. And I have only implemented item #1 above for middle-end
> builtins all conditionalized on configure finding the library
> and ensuring
> the necessary bits are available. We can obviously revisit
> this decision
> and hard require MPC when it's more mature.
>
> Although not all C99 functions are complete in the latest
> MPC, I'd like to
> get the bulk infrastructure installed now. As new complex
> functions are
> added to MPC I will update the middle-end and testcases
> accordingly. The
> patches that follow are split up by maintenance domain to
> make reviewing
> easier.
>
> Thanks,
> --Kaveh
>
> --
> Kaveh R. Ghazi address@hidden
>
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