On 12/30/2013 07:15 AM, Richard Henderson wrote:
> On 12/28/2013 01:49 PM, Peter Maydell wrote:
>> + /* These are fused multiply-add, and must be done as one
>> + * floating point operation with no rounding between the
>> + * multiplication and addition steps.
>> + * NB that doing the negations here as separate steps is
>> + * correct : an input NaN should come out with its sign bit
>> + * flipped if it is a negated-input.
>> + */
>> + if (o1 == true) {
>> + gen_helper_vfp_negs(tcg_op3, tcg_op3);
>> + }
>> +
>> + if (o0 != o1) {
>> + gen_helper_vfp_negs(tcg_op1, tcg_op1);
>> + }
>> +
>> + gen_helper_vfp_muladds(tcg_res, tcg_op1, tcg_op2, tcg_op3, fpst);
>
> Do you really get the wrong result passing the appropriate
> float_muladd_negate_* constant?
-ENOCOFFEE. You just told me right there in the comment. Duh.
Reviewed-by: Richard Henderson <rth@xxxxxxxxxxx>
r~
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