Removing/deprecating -fvia-c

Johan Tibell johan.tibell at
Sun Feb 14 14:25:31 EST 2010

On Sun, Feb 14, 2010 at 5:51 PM, Ian Lynagh <igloo at> wrote:

> Hi all,
> We are planning to remove the -fvia-c way of compiling code
> (unregisterised compilers will continue to compile via C only, but
> registerised compilers will only use the native code generator).
> We'll probably deprecate -fvia-c in the 6.14 branch, and remove it in
> 6.16.
> Simon Marlow has recently fixed FP performance for modern x86 chips in
> the native code generator in the HEAD. That was the last reason we know
> of to prefer via-C to the native code generators. But before we start
> the removal process, does anyone know of any other problems with the
> native code generators that need to be fixed first?
What about loop unrolling? I remember seeing some discussion about that
quite a while ago. Do we have any feature requests (i.e. performance bugs)
related to that?

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