Reviewed-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
On Wed, Aug 21, 2019 at 4:26 PM Samuel Pitoiset
<samuel.pitoi...@gmail.com> wrote:
>
> This fixes a regression introduced with scan&reduce operations
> on GFX10. Note that some subgroups CTS still fail on GFX10 but
> I assume it's a different issue.
>
> This fixes dEQP-VK.subgroups.arithmetic.*.subgroupexclusive*.
>
> v2: - move the logic back to ac_build_scan()
>
> Fixes: 227c29a80de "amd/common/gfx10: implement scan & reduce operations"
> Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
> ---
> src/amd/common/ac_llvm_build.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
> index 05871f5ea98..5abae00d8f6 100644
> --- a/src/amd/common/ac_llvm_build.c
> +++ b/src/amd/common/ac_llvm_build.c
> @@ -4221,10 +4221,9 @@ ac_build_scan(struct ac_llvm_context *ctx, nir_op op,
> LLVMValueRef src, LLVMValu
> if (ctx->chip_class >= GFX10) {
> result = inclusive ? src : identity;
> } else {
> - if (inclusive)
> - result = src;
> - else
> - result = ac_build_dpp(ctx, identity, src, dpp_wf_sr1,
> 0xf, 0xf, false);
> + if (!inclusive)
> + src = ac_build_dpp(ctx, identity, src, dpp_wf_sr1,
> 0xf, 0xf, false);
> + result = src;
> }
> if (maxprefix <= 1)
> return result;
> --
> 2.22.1
>
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