Re: [RFC PATCH 2/4] tests/tcg: build sha1-vector for SVE and compare

[Richard Henderson]

On 2/3/22 06:12, Alex Bennée wrote:
> The aim of this is to test code generation for vectorised operations.
> Unfortunately gcc struggles to do much with the messy sha1 code (try
> -fopt-info-vec-missed to see why). However it's better than nothing.
>
> We assume the non-vectorised output is gold and baring compiler bugs
> the outputs should match.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>   tests/tcg/aarch64/Makefile.target | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/tests/tcg/aarch64/Makefile.target 
> b/tests/tcg/aarch64/Makefile.target
> index 1d967901bd..a03844ce48 100644
> --- a/tests/tcg/aarch64/Makefile.target
> +++ b/tests/tcg/aarch64/Makefile.target
> @@ -50,6 +50,18 @@ sysregs: CFLAGS+=-march=armv8.1-a+sve
>   AARCH64_TESTS += sve-ioctls
>   sve-ioctls: CFLAGS+=-march=armv8.1-a+sve
>   
> +# Vector SHA1
> +
> +sha1-vector: CFLAGS=-march=armv8.1-a+sve -O3

For testing host vector operations, sve is not ideal -- you'll wind up with too many 
predicated operations that can't be vectorized by tcg.  (I wish sve had used a dedicated 
"true" predicate, which could be detected at translation.  Alas...)


r~