+/*
+ * Copyright © 2018 Intel Corporation
+ * Copyright © 2018 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "v3d_compiler.h"
+#include "compiler/nir/nir_builder.h"
+#include "compiler/nir/nir_format_convert.h"
+
+/** @file v3d_nir_lower_scratch.c
+ *
+ * Swizzles around the addresses of
+ * nir_intrinsic_load_scratch/nir_intrinsic_store_scratch so that a QPU stores
+ * a cacheline at a time per dword of scratch access, scalarizing and removing
+ * writemasks in the process.
+ */
+
+static nir_ssa_def *
+v3d_nir_scratch_offset(nir_builder *b, nir_intrinsic_instr *instr)
+{
+ bool is_store = instr->intrinsic == nir_intrinsic_store_scratch;
+ nir_ssa_def *offset = nir_ssa_for_src(b, instr->src[is_store ? 1 : 0], 1);
+
+ assert(nir_intrinsic_align_mul(instr) >= 4);
+ assert(nir_intrinsic_align_offset(instr) == 0);
+
+ /* The spill_offset register will already have the subgroup ID (EIDX)
+ * shifted and ORed in at bit 2, so all we need to do is to move the
+ * dword index up above V3D_CHANNELS.
+ */
+ return nir_imul_imm(b, offset, V3D_CHANNELS);
+}
+
+static void
+v3d_nir_lower_load_scratch(nir_builder *b, nir_intrinsic_instr *instr)
+{
+ b->cursor = nir_before_instr(&instr->instr);
+
+ nir_ssa_def *offset = v3d_nir_scratch_offset(b,instr);
+
+ nir_ssa_def *chans[NIR_MAX_VEC_COMPONENTS];
+ for (int i = 0; i < instr->num_components; i++) {
+ nir_ssa_def *chan_offset =
+ nir_iadd_imm(b, offset, V3D_CHANNELS * i * 4);
+
+ nir_intrinsic_instr *chan_instr =
+ nir_intrinsic_instr_create(b->shader, instr->intrinsic);
+ chan_instr->num_components = 1;
+ nir_ssa_dest_init(&chan_instr->instr, &chan_instr->dest, 1,
+ instr->dest.ssa.bit_size, NULL);
+
+ chan_instr->src[0] = nir_src_for_ssa(chan_offset);
+
+ nir_intrinsic_set_align(chan_instr, 4, 0);
+
+ nir_builder_instr_insert(b, &chan_instr->instr);
+
+ chans[i] = &chan_instr->dest.ssa;
+ }
+
+ nir_ssa_def *result = nir_vec(b, chans, instr->num_components);
+ nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(result));
+ nir_instr_remove(&instr->instr);
+}
+
+static void
+v3d_nir_lower_store_scratch(nir_builder *b, nir_intrinsic_instr *instr)
+{
+ b->cursor = nir_before_instr(&instr->instr);
+
+ nir_ssa_def *offset = v3d_nir_scratch_offset(b, instr);
+ nir_ssa_def *value = nir_ssa_for_src(b, instr->src[0],
+ instr->num_components);
+
+ for (int i = 0; i < instr->num_components; i++) {
+ if (!(nir_intrinsic_write_mask(instr) & (1 << i)))
+ continue;
+
+ nir_ssa_def *chan_offset =
+ nir_iadd_imm(b, offset, V3D_CHANNELS * i * 4);
+
+ nir_intrinsic_instr *chan_instr =
+ nir_intrinsic_instr_create(b->shader, instr->intrinsic);
+ chan_instr->num_components = 1;
+
+ chan_instr->src[0] = nir_src_for_ssa(nir_channel(b,
+ value,
+ i));
+ chan_instr->src[1] = nir_src_for_ssa(chan_offset);
+ nir_intrinsic_set_write_mask(chan_instr, 0x1);
+ nir_intrinsic_set_align(chan_instr, 4, 0);
+
+ nir_builder_instr_insert(b, &chan_instr->instr);
+ }
+
+ nir_instr_remove(&instr->instr);
+}
+
+void
+v3d_nir_lower_scratch(nir_shader *s)
+{
+ nir_foreach_function(function, s) {
+ if (!function->impl)
+ continue;
+
+ nir_builder b;
+ nir_builder_init(&b, function->impl);
+
+ nir_foreach_block(block, function->impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *intr =
+ nir_instr_as_intrinsic(instr);
+
+ switch (intr->intrinsic) {
+ case nir_intrinsic_load_scratch:
+ v3d_nir_lower_load_scratch(&b, intr);
+ break;
+ case nir_intrinsic_store_scratch:
+ v3d_nir_lower_store_scratch(&b, intr);
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ nir_metadata_preserve(function->impl,
+ nir_metadata_block_index |
+ nir_metadata_dominance);
+ }
+}
projects / mesa.git / commitdiff