Re: [Qemu-devel] [PATCH 13/19] Add VSX ISA2.06 Multiply Add Instructions

[Richard Henderson]

On 10/25/2013 10:20 AM, Peter Maydell wrote:
> Are you sure that doing the arithmetic with the softfloat 128 bit
> float operations doesn't set the inexact flag anywhere it
> shouldn't? (ie where the intermediate product is not exact in
> 128 bit format but the final result is exact in 64 or 32 bits).

The 128 bit multiply cannot given an inexact, and I believe that if the 128 bit
addition gives inexact then the 64-bit fma result would also have inexact.


r~