nir: Add subgroup shuffle intrinsics and lowering
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
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@ -2544,6 +2544,7 @@ typedef struct nir_lower_subgroups_options {
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bool lower_to_scalar:1;
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bool lower_vote_trivial:1;
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bool lower_subgroup_masks:1;
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bool lower_shuffle:1;
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} nir_lower_subgroups_options;
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bool nir_lower_subgroups(nir_shader *shader,
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@ -157,6 +157,16 @@ INTRINSIC(ballot_find_lsb, 1, ARR(4), true, 1, 0,
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INTRINSIC(ballot_find_msb, 1, ARR(4), true, 1, 0,
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0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
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/** Shuffle operations from SPIR-V. */
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INTRINSIC(shuffle, 2, ARR(0, 1), true, 0, 0,
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0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
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INTRINSIC(shuffle_xor, 2, ARR(0, 1), true, 0, 0,
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0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
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INTRINSIC(shuffle_up, 2, ARR(0, 1), true, 0, 0,
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0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
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INTRINSIC(shuffle_down, 2, ARR(0, 1), true, 0, 0,
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0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
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/**
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* Basic Geometry Shader intrinsics.
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*
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@ -80,7 +80,7 @@ uint_to_ballot_type(nir_builder *b, nir_ssa_def *value,
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}
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static nir_ssa_def *
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lower_read_invocation_to_scalar(nir_builder *b, nir_intrinsic_instr *intrin)
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lower_subgroup_op_to_scalar(nir_builder *b, nir_intrinsic_instr *intrin)
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{
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/* This is safe to call on scalar things but it would be silly */
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assert(intrin->dest.ssa.num_components > 1);
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@ -99,8 +99,10 @@ lower_read_invocation_to_scalar(nir_builder *b, nir_intrinsic_instr *intrin)
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/* value */
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chan_intrin->src[0] = nir_src_for_ssa(nir_channel(b, value, i));
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/* invocation */
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if (intrin->intrinsic == nir_intrinsic_read_invocation)
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if (nir_intrinsic_infos[intrin->intrinsic].num_srcs > 1) {
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assert(nir_intrinsic_infos[intrin->intrinsic].num_srcs == 2);
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nir_src_copy(&chan_intrin->src[1], &intrin->src[1], chan_intrin);
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}
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nir_builder_instr_insert(b, &chan_intrin->instr);
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@ -136,6 +138,45 @@ lower_vote_eq_to_scalar(nir_builder *b, nir_intrinsic_instr *intrin)
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return result;
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}
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static nir_ssa_def *
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lower_shuffle(nir_builder *b, nir_intrinsic_instr *intrin,
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bool lower_to_scalar)
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{
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nir_ssa_def *index = nir_load_subgroup_invocation(b);
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switch (intrin->intrinsic) {
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case nir_intrinsic_shuffle_xor:
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assert(intrin->src[1].is_ssa);
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index = nir_ixor(b, index, intrin->src[1].ssa);
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break;
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case nir_intrinsic_shuffle_up:
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assert(intrin->src[1].is_ssa);
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index = nir_isub(b, index, intrin->src[1].ssa);
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break;
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case nir_intrinsic_shuffle_down:
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assert(intrin->src[1].is_ssa);
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index = nir_iadd(b, index, intrin->src[1].ssa);
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break;
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default:
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unreachable("Invalid intrinsic");
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}
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nir_intrinsic_instr *shuffle =
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nir_intrinsic_instr_create(b->shader, nir_intrinsic_shuffle);
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shuffle->num_components = intrin->num_components;
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nir_src_copy(&shuffle->src[0], &intrin->src[0], shuffle);
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shuffle->src[1] = nir_src_for_ssa(index);
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nir_ssa_dest_init(&shuffle->instr, &shuffle->dest,
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intrin->dest.ssa.num_components,
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intrin->dest.ssa.bit_size, NULL);
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if (lower_to_scalar && shuffle->num_components > 1) {
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return lower_subgroup_op_to_scalar(b, shuffle);
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} else {
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nir_builder_instr_insert(b, &shuffle->instr);
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return &shuffle->dest.ssa;
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}
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}
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static nir_ssa_def *
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lower_subgroups_intrin(nir_builder *b, nir_intrinsic_instr *intrin,
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const nir_lower_subgroups_options *options)
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@ -164,7 +205,7 @@ lower_subgroups_intrin(nir_builder *b, nir_intrinsic_instr *intrin,
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case nir_intrinsic_read_invocation:
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case nir_intrinsic_read_first_invocation:
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if (options->lower_to_scalar && intrin->num_components > 1)
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return lower_read_invocation_to_scalar(b, intrin);
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return lower_subgroup_op_to_scalar(b, intrin);
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break;
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case nir_intrinsic_load_subgroup_eq_mask:
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@ -284,6 +325,20 @@ lower_subgroups_intrin(nir_builder *b, nir_intrinsic_instr *intrin,
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return nir_ieq(b, nir_load_subgroup_invocation(b), &first->dest.ssa);
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}
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case nir_intrinsic_shuffle:
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if (options->lower_to_scalar && intrin->num_components > 1)
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return lower_subgroup_op_to_scalar(b, intrin);
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break;
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case nir_intrinsic_shuffle_xor:
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case nir_intrinsic_shuffle_up:
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case nir_intrinsic_shuffle_down:
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if (options->lower_shuffle)
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return lower_shuffle(b, intrin, options->lower_to_scalar);
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else if (options->lower_to_scalar && intrin->num_components > 1)
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return lower_subgroup_op_to_scalar(b, intrin);
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break;
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default:
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break;
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}
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