[PATCH][1/2] Move mult synthesis definitions into a separate file

[Kyrill Tkachov]

Hi all,

There are other places besides expand where we might want to synthesize an integer
multiplication by a constant.  Thankfully the algorithm selection code in expmed.c
is already quite well separated from the RTL implementation, so if we can just factor
out the prototype of choose_mult_variant and some enums and structs that it needs into
a separate header file we can reuse them from other parts of the compiler.

I need this for patch 2/2 which hooks up the vectorizer to synthesize vector
multiplications using sequences of shifts and other arithmetic ops when appropriate.

The new header is called mult-synthesis.h. Should I add it to some makefile?
grepping around for a bit I'm not sure what to do about it.

Bootstrapped and tested on arm, aarch64, x86_64.

Thanks,
Kyrill

2016-06-13  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * mult-synthesis.h: New file.  Add choose_mult_variant prototype.
     * expmed.h: Include mult-synthesis.h
     (enum alg_code): Move to mult-synthesis.h
     (struct mult_cost): Likewise.
     (struct algorithm): Likewise.
     * expmed.c (enum mult_variant): Move to mult-synthesis.h
     (choose_mult_variant): Delete prototype.  Remove static qualifier.
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