Re: [PATCH 6/7] target/ppc: use existing VsrD() macro to eliminate HI_IDX and LO_IDX from dfp_helper.c

[Richard Henderson <richard.henderson@linaro.org>]

On 9/24/19 8:35 AM, Mark Cave-Ayland wrote:
> Switch over all accesses to the decimal numbers held in struct PPC_DFP from
> using HI_IDX and LO_IDX to using the VsrD() macro instead. Not only does this
> allow the compiler to ensure that the various dfp_* functions are being passed
> a ppc_vsr_t rather than an arbitrary uint64_t pointer, but also allows the
> host endian-specific HI_IDX and LO_IDX to be completely removed from
> dfp_helper.c.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  target/ppc/dfp_helper.c | 70 ++++++++++++++++++-----------------------
>  1 file changed, 31 insertions(+), 39 deletions(-)

Ho hum, vs patch 5 that was me not realizing how many different places really
want to manipulate a 128-bit value.  Do go ahead and keep ppc_vsr_t for now.

It does look like we might be well served by using Int128 at some point, so
that these operations can expand to int128_t on appropriate hw so that the
compiler can DTRT with these.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~