Hi all,

This patch allows us to handle the *combine_vcvtf2i pattern in rtx costs by properly identifying it
as a toint coversion. Before this I saw a pattern like:
(set (reg/i:SI 0 r0)
     (fix:SI (fix:SF (mult:SF (reg:SF 16 s0 [ a ])
                 (const_double:SF 3.2e+1 [0x0.8p+6])))))

being assigned a cost of 40 because the costs blindly recursed into the operands.
With this patch for -mcpu=cortex-a57 I see it being assigned a cost of 4.

Bootstrapped and tested on arm-none-linux-gnueabihf.

Ok for trunk?

Thanks,
Kyrill

2015-10-27  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/arm/arm.c (arm_new_rtx_costs, FIX case): Handle
     combine_vcvtf2i pattern.