Re: [Qemu-devel] [PATCH 6/8] target/ppc: Optimize emulation of vclzw instruction

[Richard Henderson]

On 6/19/19 1:03 PM, Stefan Brankovic wrote:
> Optimize Altivec instruction vclzw (Vector Count Leading Zeros Word).
> This instruction counts the number of leading zeros of each word element
> in source register and places result in the appropriate word element of
> destination register.
> 
> Counting is to be performed in four iterations of for loop(one for each
> word elemnt of source register vB). Every iteration consists of loading
> appropriate word element from source register, counting leading zeros
> with tcg_gen_clzi_i32, and saving the result in appropriate word element
> of destination register.
> 
> Signed-off-by: Stefan Brankovic <address@hidden>
> ---
>  target/ppc/helper.h                 |  1 -
>  target/ppc/int_helper.c             |  3 ---
>  target/ppc/translate/vmx-impl.inc.c | 28 +++++++++++++++++++++++++++-
>  3 files changed, 27 insertions(+), 5 deletions(-)

Reviewed-by: Richard Henderson <address@hidden>


r~