[Qemu-devel] Re: [PATCH 3/3] target-ppc: fix sNaN propagation

[Alexander Graf]

On 02.01.2011, at 15:39, Aurelien Jarno wrote:

> The current FPU code returns 0.0 if one of the operand is a
> signaling NaN and the VXSNAN exception is disabled.
> 
> fload_invalid_op_excp() doesn't return a qNaN in case of a VXSNAN
> exception as the operand should be propagated instead of a new
> qNaN to be generated. Fix that by calling fload_invalid_op_excp()
> only for the exception generation (if enabled), and use the softfloat
> code to correctly compute the result.

Reading through this I'm afraid I understand too little of the matter. Anyone 
else who's more proficient in FP feels like taking up the review?


Alex