struct lower_intrinsics_state {
nir_shader *nir;
- unsigned dispatch_width;
nir_function_impl *impl;
bool progress;
nir_builder builder;
- unsigned local_workgroup_size;
};
static bool
nir_builder *b = &state->builder;
nir_shader *nir = state->nir;
+ /* Reuse calculated values inside the block. */
+ nir_ssa_def *local_index = NULL;
+ nir_ssa_def *local_id = NULL;
+
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_ssa_def *sysval;
switch (intrinsic->intrinsic) {
- case nir_intrinsic_load_local_invocation_index: {
- /* We construct the local invocation index from:
- *
- * gl_LocalInvocationIndex =
- * cs_thread_local_id + subgroup_invocation;
- */
- nir_ssa_def *subgroup_id;
- if (state->local_workgroup_size <= state->dispatch_width)
- subgroup_id = nir_imm_int(b, 0);
- else
- subgroup_id = nir_load_subgroup_id(b);
-
- nir_ssa_def *thread_local_id =
- nir_imul(b, subgroup_id, nir_imm_int(b, state->dispatch_width));
- nir_ssa_def *channel = nir_load_subgroup_invocation(b);
- sysval = nir_iadd(b, channel, thread_local_id);
- break;
- }
+ case nir_intrinsic_load_local_group_size:
+ case nir_intrinsic_load_work_group_id:
+ /* Convert this to 32-bit if it's not */
+ if (intrinsic->dest.ssa.bit_size == 64) {
+ intrinsic->dest.ssa.bit_size = 32;
+ sysval = nir_u2u64(b, &intrinsic->dest.ssa);
+ nir_ssa_def_rewrite_uses_after(&intrinsic->dest.ssa,
+ nir_src_for_ssa(sysval),
+ sysval->parent_instr);
+ }
+ continue;
- case nir_intrinsic_load_subgroup_id:
- if (state->local_workgroup_size > 8)
- continue;
+ case nir_intrinsic_load_local_invocation_index:
+ case nir_intrinsic_load_local_invocation_id: {
+ /* First time we are using those, so let's calculate them. */
+ if (!local_index) {
+ assert(!local_id);
+
+ nir_ssa_def *subgroup_id = nir_load_subgroup_id(b);
+
+ nir_ssa_def *thread_local_id =
+ nir_imul(b, subgroup_id, nir_load_simd_width_intel(b));
+ nir_ssa_def *channel = nir_load_subgroup_invocation(b);
+ nir_ssa_def *linear = nir_iadd(b, channel, thread_local_id);
+
+ nir_ssa_def *size_x;
+ nir_ssa_def *size_y;
+ if (state->nir->info.cs.local_size_variable) {
+ nir_ssa_def *size_xyz = nir_load_local_group_size(b);
+ size_x = nir_channel(b, size_xyz, 0);
+ size_y = nir_channel(b, size_xyz, 1);
+ } else {
+ size_x = nir_imm_int(b, nir->info.cs.local_size[0]);
+ size_y = nir_imm_int(b, nir->info.cs.local_size[1]);
+ }
+
+ /* The local invocation index and ID must respect the following
+ *
+ * gl_LocalInvocationID.x =
+ * gl_LocalInvocationIndex % gl_WorkGroupSize.x;
+ * gl_LocalInvocationID.y =
+ * (gl_LocalInvocationIndex / gl_WorkGroupSize.x) %
+ * gl_WorkGroupSize.y;
+ * gl_LocalInvocationID.z =
+ * (gl_LocalInvocationIndex /
+ * (gl_WorkGroupSize.x * gl_WorkGroupSize.y)) %
+ * gl_WorkGroupSize.z;
+ *
+ * However, the final % gl_WorkGroupSize.z does nothing unless we
+ * accidentally end up with a gl_LocalInvocationIndex that is too
+ * large so it can safely be omitted.
+ */
+
+ if (state->nir->info.cs.derivative_group != DERIVATIVE_GROUP_QUADS) {
+ /* If we are not grouping in quads, just set the local invocatio
+ * index linearly, and calculate local invocation ID from that.
+ */
+ local_index = linear;
+
+ nir_ssa_def *id_x, *id_y, *id_z;
+ id_x = nir_umod(b, local_index, size_x);
+ id_y = nir_umod(b, nir_udiv(b, local_index, size_x), size_y);
+ id_z = nir_udiv(b, local_index, nir_imul(b, size_x, size_y));
+ local_id = nir_vec3(b, id_x, id_y, id_z);
+ } else {
+ /* For quads, first we figure out the 2x2 grid the invocation
+ * belongs to -- treating extra Z layers as just more rows.
+ * Then map that into local invocation ID (trivial) and local
+ * invocation index. Skipping Z simplify index calculation.
+ */
+
+ nir_ssa_def *one = nir_imm_int(b, 1);
+ nir_ssa_def *double_size_x = nir_ishl(b, size_x, one);
+
+ /* ID within a pair of rows, where each group of 4 is 2x2 quad. */
+ nir_ssa_def *row_pair_id = nir_umod(b, linear, double_size_x);
+ nir_ssa_def *y_row_pairs = nir_udiv(b, linear, double_size_x);
+
+ nir_ssa_def *x =
+ nir_ior(b,
+ nir_iand(b, row_pair_id, one),
+ nir_iand(b, nir_ishr(b, row_pair_id, one),
+ nir_imm_int(b, 0xfffffffe)));
+ nir_ssa_def *y =
+ nir_ior(b,
+ nir_ishl(b, y_row_pairs, one),
+ nir_iand(b, nir_ishr(b, row_pair_id, one), one));
+
+ local_id = nir_vec3(b, x,
+ nir_umod(b, y, size_y),
+ nir_udiv(b, y, size_y));
+ local_index = nir_iadd(b, x, nir_imul(b, y, size_x));
+ }
+ }
- /* For small workgroup sizes, we know subgroup_id will be zero */
- sysval = nir_imm_int(b, 0);
+ assert(local_id);
+ assert(local_index);
+ if (intrinsic->intrinsic == nir_intrinsic_load_local_invocation_id)
+ sysval = local_id;
+ else
+ sysval = local_index;
break;
+ }
case nir_intrinsic_load_num_subgroups: {
- unsigned local_workgroup_size =
- nir->info.cs.local_size[0] * nir->info.cs.local_size[1] *
- nir->info.cs.local_size[2];
- unsigned num_subgroups =
- DIV_ROUND_UP(local_workgroup_size, state->dispatch_width);
- sysval = nir_imm_int(b, num_subgroups);
+ nir_ssa_def *size;
+ if (state->nir->info.cs.local_size_variable) {
+ nir_ssa_def *size_xyz = nir_load_local_group_size(b);
+ nir_ssa_def *size_x = nir_channel(b, size_xyz, 0);
+ nir_ssa_def *size_y = nir_channel(b, size_xyz, 1);
+ nir_ssa_def *size_z = nir_channel(b, size_xyz, 2);
+ size = nir_imul(b, nir_imul(b, size_x, size_y), size_z);
+ } else {
+ size = nir_imm_int(b, nir->info.cs.local_size[0] *
+ nir->info.cs.local_size[1] *
+ nir->info.cs.local_size[2]);
+ }
+
+ /* Calculate the equivalent of DIV_ROUND_UP. */
+ nir_ssa_def *simd_width = nir_load_simd_width_intel(b);
+ sysval =
+ nir_udiv(b, nir_iadd_imm(b, nir_iadd(b, size, simd_width), -1),
+ simd_width);
break;
}
continue;
}
+ if (intrinsic->dest.ssa.bit_size == 64)
+ sysval = nir_u2u64(b, sysval);
+
nir_ssa_def_rewrite_uses(&intrinsic->dest.ssa, nir_src_for_ssa(sysval));
nir_instr_remove(&intrinsic->instr);
}
bool
-brw_nir_lower_cs_intrinsics(nir_shader *nir,
- unsigned dispatch_width)
+brw_nir_lower_cs_intrinsics(nir_shader *nir)
{
- assert(nir->info.stage == MESA_SHADER_COMPUTE);
+ assert(nir->info.stage == MESA_SHADER_COMPUTE ||
+ nir->info.stage == MESA_SHADER_KERNEL);
+
+ struct lower_intrinsics_state state = {
+ .nir = nir,
+ };
+
+ /* Constraints from NV_compute_shader_derivatives. */
+ if (!nir->info.cs.local_size_variable) {
+ if (nir->info.cs.derivative_group == DERIVATIVE_GROUP_QUADS) {
+ assert(nir->info.cs.local_size[0] % 2 == 0);
+ assert(nir->info.cs.local_size[1] % 2 == 0);
+ } else if (nir->info.cs.derivative_group == DERIVATIVE_GROUP_LINEAR) {
+ ASSERTED unsigned local_workgroup_size =
+ nir->info.cs.local_size[0] *
+ nir->info.cs.local_size[1] *
+ nir->info.cs.local_size[2];
+ assert(local_workgroup_size % 4 == 0);
+ }
+ }
- bool progress = false;
- struct lower_intrinsics_state state;
- memset(&state, 0, sizeof(state));
- state.nir = nir;
- state.dispatch_width = dispatch_width;
- state.local_workgroup_size = nir->info.cs.local_size[0] *
- nir->info.cs.local_size[1] *
- nir->info.cs.local_size[2];
-
- do {
- state.progress = false;
- nir_foreach_function(function, nir) {
- if (function->impl) {
- state.impl = function->impl;
- lower_cs_intrinsics_convert_impl(&state);
- }
+ nir_foreach_function(function, nir) {
+ if (function->impl) {
+ state.impl = function->impl;
+ lower_cs_intrinsics_convert_impl(&state);
}
- progress |= state.progress;
- } while (state.progress);
+ }
- return progress;
+ return state.progress;
}
projects / mesa.git / blobdiff