Re: [Qemu-devel] [PATCH 17/22] target-arm: Ignore most exceptions from scalbn when doing fixpoint conversion

[Richard Henderson]

On 12/31/2013 05:35 AM, Peter Maydell wrote:
> The VFP fixed point conversion helpers first call float_scalbn and
> then convert the result to an integer. This scalbn operation may
> set floating point exception flags for:
>  * overflow & inexact (if it overflows to infinity)
>  * input denormal squashed to zero
>  * output denormal squashed to zero
> Of these, we only care about the input-denormal flag, since
> the output of the whole scale-and-convert operation will be
> an integer (so squashed-output-denormal and overflow don't
> apply). Suppress the others by saving the pre-scalb exception
> flags and only copying across a potential input-denormal flag.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  target-arm/helper.c | 9 +++++++++
>  1 file changed, 9 insertions(+)

Reviewed-by: Richard Henderson <address@hidden>


r~