[PATCH, FT32] initial support

[Paolo Bonzini]

On 03/02/2015 07:05, Andrew Pinski wrote:
> Likewise of:
> +(define_insn "abssi2"
> +  [(set (match_operand:SI 0 "register_operand" "=r")
> + (abs:SI (match_operand:SI 1 "register_operand" "r")))
> +   (clobber (match_scratch:SI 2 "=&r"))]
> +  ""
> +  "ashr.l\t%2,%1,31\;xor.l\t%0,%1,%2\;sub.l\t%0,%0,%2")
> 

optabs.c's expand_abs_nojump already knows this trick:

/* If this machine has expensive jumps, we can do integer absolute
   value of X as (((signed) x >> (W-1)) ^ x) - ((signed) x >> (W-1)),
   where W is the width of MODE. */

So if you define BRANCH_COST to be 2 or more there should be no need for
this pattern at all.

Paolo