Re: [Qemu-devel] [PATCH v3 2/5] target-tricore: Added MADD.F and MSUB.F instructions

[Richard Henderson <rth@twiddle.net>]

On 11/11/2016 03:20 PM, Bastian Koppelmann wrote:
> +        if (muladd_negate_c) {
> +            cSign ^= 1;
> +        }
> +        if (((aExp == 0xff) || (bExp == 0xff)) && (cExp == 0xff)) {
> +            if (aSign ^ bSign ^ cSign) {

If you're going to make muladd_negate_c a bool, you might as well just fold 
that in here:

   if (aSign ^ bSign ^ cSign ^ muladd_negate_c)

And, come to think of it,

> +            arg1 = float32_squash_input_denormal(arg1, &env->fp_status);
> +            arg2 = float32_squash_input_denormal(arg2, &env->fp_status);
> +            arg3 = float32_squash_input_denormal(arg3, &env->fp_status);

can be folded into f_maddsub_nan_result as

     } else if (float32_is_infinity(arg1)
                && float32_is_zero(float32_squash_input_denormal
                   (arg2, &env->fp_status))) {
         return MUL_NAN;
     } else if (float32_is_infinity(arg2)
                && float32_is_zero(float32_squash_input_denormal
                   (arg1, &env->fp_status))) {
         return MUL_NAN;

which makes it less likely that the squash will actually be called.

Otherwise,

Reviewed-by: Richard Henderson <rth@twiddle.net>


r~