[Mesa-dev] [PATCH v2 04/13] i965: Add nir based intrinsic lowering and thread ID uniform
Jordan Justen
jordan.l.justen at intel.com
Fri May 27 18:24:29 UTC 2016
We add a lowering pass for nir intrinsics. This pass can replace nir
intrinsics with driver specific nir lower code.
We lower the gl_LocalInvocationIndex intrinsic based on a uniform
which is loaded with a thread specific ID.
We also lower the gl_LocalInvocationID based on
gl_LocalInvocationIndex.
v2:
* Create variable during lowering pass. (Ken)
Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
---
src/mesa/drivers/dri/i965/Makefile.sources | 1 +
src/mesa/drivers/dri/i965/brw_nir.h | 1 +
src/mesa/drivers/dri/i965/brw_nir_intrinsics.c | 163 +++++++++++++++++++++++++
3 files changed, 165 insertions(+)
create mode 100644 src/mesa/drivers/dri/i965/brw_nir_intrinsics.c
diff --git a/src/mesa/drivers/dri/i965/Makefile.sources b/src/mesa/drivers/dri/i965/Makefile.sources
index d8711ed..f448551 100644
--- a/src/mesa/drivers/dri/i965/Makefile.sources
+++ b/src/mesa/drivers/dri/i965/Makefile.sources
@@ -46,6 +46,7 @@ i965_compiler_FILES = \
brw_nir.c \
brw_nir_analyze_boolean_resolves.c \
brw_nir_attribute_workarounds.c \
+ brw_nir_intrinsics.c \
brw_nir_opt_peephole_ffma.c \
brw_packed_float.c \
brw_predicated_break.cpp \
diff --git a/src/mesa/drivers/dri/i965/brw_nir.h b/src/mesa/drivers/dri/i965/brw_nir.h
index 409e49a..b944681 100644
--- a/src/mesa/drivers/dri/i965/brw_nir.h
+++ b/src/mesa/drivers/dri/i965/brw_nir.h
@@ -91,6 +91,7 @@ void brw_nir_analyze_boolean_resolves(nir_shader *nir);
nir_shader *brw_preprocess_nir(const struct brw_compiler *compiler,
nir_shader *nir);
+bool brw_nir_lower_intrinsics(nir_shader *nir);
void brw_nir_lower_vs_inputs(nir_shader *nir,
const struct brw_device_info *devinfo,
bool is_scalar,
diff --git a/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c b/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c
new file mode 100644
index 0000000..e49b435
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * 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 "brw_nir.h"
+#include "compiler/nir/nir_builder.h"
+
+struct lower_intrinsics_state {
+ nir_shader *nir;
+ nir_function_impl *impl;
+ bool progress;
+ nir_builder builder;
+ nir_variable *cs_thread_id;
+};
+
+static nir_variable *
+get_cs_local_id_uniform(struct lower_intrinsics_state *state)
+{
+ if (state->cs_thread_id == NULL) {
+ int location = -1;
+ nir_foreach_variable(var, &state->nir->uniforms) {
+ location = MAX2(location, var->data.location);
+ }
+
+ state->cs_thread_id =
+ nir_variable_create(state->nir, nir_var_uniform, glsl_uint_type(),
+ "cs_thread_local_id");
+ state->cs_thread_id->data.location = location + 1;
+ }
+
+ return state->cs_thread_id;
+}
+
+static bool
+lower_cs_intrinsics_convert_block(struct lower_intrinsics_state *state,
+ nir_block *block)
+{
+ bool progress = false;
+ nir_builder *b = &state->builder;
+ nir_shader *nir = state->nir;
+
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
+
+ b->cursor = nir_after_instr(&intrinsic->instr);
+
+ 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 + channel_num;
+ */
+ nir_variable *id_var = get_cs_local_id_uniform(state);
+ nir_ssa_def *channel =
+ nir_load_system_value(b, nir_intrinsic_load_channel_num, 0);
+ sysval = nir_iadd(b, channel, nir_load_var(b, id_var));
+ break;
+ }
+
+ case nir_intrinsic_load_local_invocation_id: {
+ /* We lower gl_LocalInvocationID from gl_LocalInvocationIndex based
+ * on this formula:
+ *
+ * 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;
+ */
+ unsigned *size = nir->info.cs.local_size;
+
+ nir_ssa_def *local_index =
+ nir_load_system_value(b, nir_intrinsic_load_local_invocation_index, 0);
+
+ nir_const_value uvec3;
+ uvec3.u32[0] = 1;
+ uvec3.u32[1] = size[0];
+ uvec3.u32[2] = size[0] * size[1];
+ nir_ssa_def *div_val = nir_build_imm(b, 3, 32, uvec3);
+ uvec3.u32[0] = size[0];
+ uvec3.u32[1] = size[1];
+ uvec3.u32[2] = size[2];
+ nir_ssa_def *mod_val = nir_build_imm(b, 3, 32, uvec3);
+
+ sysval = nir_imod(b, nir_idiv(b, local_index, div_val), mod_val);
+ break;
+ }
+
+ default:
+ continue;
+ }
+
+ nir_ssa_def_rewrite_uses(&intrinsic->dest.ssa, nir_src_for_ssa(sysval));
+ nir_instr_remove(&intrinsic->instr);
+
+ state->progress = true;
+ }
+
+ return progress;
+}
+
+static void
+lower_cs_intrinsics_convert_impl(struct lower_intrinsics_state *state)
+{
+ nir_builder_init(&state->builder, state->impl);
+
+ nir_foreach_block(block, state->impl) {
+ lower_cs_intrinsics_convert_block(state, block);
+ }
+
+ nir_metadata_preserve(state->impl,
+ nir_metadata_block_index | nir_metadata_dominance);
+}
+
+bool
+brw_nir_lower_intrinsics(nir_shader *nir)
+{
+ bool progress = false;
+ struct lower_intrinsics_state state;
+ memset(&state, 0, sizeof(state));
+ state.nir = nir;
+
+ do {
+ state.progress = false;
+ 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;
+}
--
2.8.1
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