radv: Enable lowering dynamic quad broadcasts.

This will lower dynamic quad broadcasts into something that both
LLVM and ACO can understand. On hardware which supports shuffles,
they are lowered to shuffle, on older hardware (GFX6-7) they will
get lowered to constant quad broadcasts.

Fixes dEQP-VK.subgroups.quad.*.subgroupquadbroadcast_nonconst_*

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4147>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4147>

diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index 37b8ee45e3445c734212297665273c60bb5b4e4e..049611371f6d7148c66eb9e074635efaceddfa12 100644 (file)
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -480,6 +480,7 @@ radv_shader_compile_to_nir(struct radv_device *device,
 
        nir_lower_global_vars_to_local(nir);
        nir_remove_dead_variables(nir, nir_var_function_temp);
+       bool gfx7minus = device->physical_device->rad_info.chip_class <= GFX7;
        nir_lower_subgroups(nir, &(struct nir_lower_subgroups_options) {
                        .subgroup_size = 64,
                        .ballot_bit_size = 64,
@@ -488,6 +489,8 @@ radv_shader_compile_to_nir(struct radv_device *device,
                        .lower_shuffle = 1,
                        .lower_shuffle_to_32bit = 1,
                        .lower_vote_eq_to_ballot = 1,
+                       .lower_quad_broadcast_dynamic = 1,
+                       .lower_quad_broadcast_dynamic_to_const = gfx7minus,
                });
 
        nir_lower_load_const_to_scalar(nir);