nir: move to compiler/

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>

1 files changed, 364 insertions, 0 deletions

diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
new file mode 100644
index 0000000..88ba3a1
--- /dev/null
+++ b/src/compiler/nir/nir_builder.h
@@ -0,0 +1,364 @@
+/*
+ * Copyright © 2014-2015 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.
+ */
+
+#ifndef NIR_BUILDER_H
+#define NIR_BUILDER_H
+
+#include "nir_control_flow.h"
+
+struct exec_list;
+
+typedef struct nir_builder {
+   nir_cursor cursor;
+
+   nir_shader *shader;
+   nir_function_impl *impl;
+} nir_builder;
+
+static inline void
+nir_builder_init(nir_builder *build, nir_function_impl *impl)
+{
+   memset(build, 0, sizeof(*build));
+   build->impl = impl;
+   build->shader = impl->function->shader;
+}
+
+static inline void
+nir_builder_init_simple_shader(nir_builder *build, void *mem_ctx,
+                               gl_shader_stage stage,
+                               const nir_shader_compiler_options *options)
+{
+   build->shader = nir_shader_create(mem_ctx, stage, options);
+   nir_function *func = nir_function_create(build->shader, "main");
+   build->impl = nir_function_impl_create(func);
+   build->cursor = nir_after_cf_list(&build->impl->body);
+}
+
+static inline void
+nir_builder_instr_insert(nir_builder *build, nir_instr *instr)
+{
+   nir_instr_insert(build->cursor, instr);
+
+   /* Move the cursor forward. */
+   build->cursor = nir_after_instr(instr);
+}
+
+static inline void
+nir_builder_cf_insert(nir_builder *build, nir_cf_node *cf)
+{
+   nir_cf_node_insert(build->cursor, cf);
+}
+
+static inline nir_ssa_def *
+nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value)
+{
+   nir_load_const_instr *load_const =
+      nir_load_const_instr_create(build->shader, num_components);
+   if (!load_const)
+      return NULL;
+
+   load_const->value = value;
+
+   nir_builder_instr_insert(build, &load_const->instr);
+
+   return &load_const->def;
+}
+
+static inline nir_ssa_def *
+nir_imm_float(nir_builder *build, float x)
+{
+   nir_const_value v;
+
+   memset(&v, 0, sizeof(v));
+   v.f[0] = x;
+
+   return nir_build_imm(build, 1, v);
+}
+
+static inline nir_ssa_def *
+nir_imm_vec4(nir_builder *build, float x, float y, float z, float w)
+{
+   nir_const_value v;
+
+   memset(&v, 0, sizeof(v));
+   v.f[0] = x;
+   v.f[1] = y;
+   v.f[2] = z;
+   v.f[3] = w;
+
+   return nir_build_imm(build, 4, v);
+}
+
+static inline nir_ssa_def *
+nir_imm_int(nir_builder *build, int x)
+{
+   nir_const_value v;
+
+   memset(&v, 0, sizeof(v));
+   v.i[0] = x;
+
+   return nir_build_imm(build, 1, v);
+}
+
+static inline nir_ssa_def *
+nir_imm_ivec4(nir_builder *build, int x, int y, int z, int w)
+{
+   nir_const_value v;
+
+   memset(&v, 0, sizeof(v));
+   v.i[0] = x;
+   v.i[1] = y;
+   v.i[2] = z;
+   v.i[3] = w;
+
+   return nir_build_imm(build, 4, v);
+}
+
+static inline nir_ssa_def *
+nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
+              nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)
+{
+   const nir_op_info *op_info = &nir_op_infos[op];
+   nir_alu_instr *instr = nir_alu_instr_create(build->shader, op);
+   if (!instr)
+      return NULL;
+
+   instr->src[0].src = nir_src_for_ssa(src0);
+   if (src1)
+      instr->src[1].src = nir_src_for_ssa(src1);
+   if (src2)
+      instr->src[2].src = nir_src_for_ssa(src2);
+   if (src3)
+      instr->src[3].src = nir_src_for_ssa(src3);
+
+   /* Guess the number of components the destination temporary should have
+    * based on our input sizes, if it's not fixed for the op.
+    */
+   unsigned num_components = op_info->output_size;
+   if (num_components == 0) {
+      for (unsigned i = 0; i < op_info->num_inputs; i++) {
+         if (op_info->input_sizes[i] == 0)
+            num_components = MAX2(num_components,
+                                  instr->src[i].src.ssa->num_components);
+      }
+   }
+   assert(num_components != 0);
+
+   /* Make sure we don't swizzle from outside of our source vector (like if a
+    * scalar value was passed into a multiply with a vector).
+    */
+   for (unsigned i = 0; i < op_info->num_inputs; i++) {
+      for (unsigned j = instr->src[i].src.ssa->num_components; j < 4; j++) {
+         instr->src[i].swizzle[j] = instr->src[i].src.ssa->num_components - 1;
+      }
+   }
+
+   nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
+   instr->dest.write_mask = (1 << num_components) - 1;
+
+   nir_builder_instr_insert(build, &instr->instr);
+
+   return &instr->dest.dest.ssa;
+}
+
+#define ALU1(op)                                                          \
+static inline nir_ssa_def *                                               \
+nir_##op(nir_builder *build, nir_ssa_def *src0)                           \
+{                                                                         \
+   return nir_build_alu(build, nir_op_##op, src0, NULL, NULL, NULL);      \
+}
+
+#define ALU2(op)                                                          \
+static inline nir_ssa_def *                                               \
+nir_##op(nir_builder *build, nir_ssa_def *src0, nir_ssa_def *src1)        \
+{                                                                         \
+   return nir_build_alu(build, nir_op_##op, src0, src1, NULL, NULL);      \
+}
+
+#define ALU3(op)                                                          \
+static inline nir_ssa_def *                                               \
+nir_##op(nir_builder *build, nir_ssa_def *src0,                           \
+         nir_ssa_def *src1, nir_ssa_def *src2)                            \
+{                                                                         \
+   return nir_build_alu(build, nir_op_##op, src0, src1, src2, NULL);      \
+}
+
+#define ALU4(op)                                                          \
+static inline nir_ssa_def *                                               \
+nir_##op(nir_builder *build, nir_ssa_def *src0,                           \
+         nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)         \
+{                                                                         \
+   return nir_build_alu(build, nir_op_##op, src0, src1, src2, src3);      \
+}
+
+#include "nir_builder_opcodes.h"
+
+static inline nir_ssa_def *
+nir_vec(nir_builder *build, nir_ssa_def **comp, unsigned num_components)
+{
+   switch (num_components) {
+   case 4:
+      return nir_vec4(build, comp[0], comp[1], comp[2], comp[3]);
+   case 3:
+      return nir_vec3(build, comp[0], comp[1], comp[2]);
+   case 2:
+      return nir_vec2(build, comp[0], comp[1]);
+   case 1:
+      return comp[0];
+   default:
+      unreachable("bad component count");
+      return NULL;
+   }
+}
+
+/**
+ * Similar to nir_fmov, but takes a nir_alu_src instead of a nir_ssa_def.
+ */
+static inline nir_ssa_def *
+nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
+{
+   nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_fmov);
+   nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
+   mov->dest.write_mask = (1 << num_components) - 1;
+   mov->src[0] = src;
+   nir_builder_instr_insert(build, &mov->instr);
+
+   return &mov->dest.dest.ssa;
+}
+
+static inline nir_ssa_def *
+nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
+{
+   nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_imov);
+   nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
+   mov->dest.write_mask = (1 << num_components) - 1;
+   mov->src[0] = src;
+   nir_builder_instr_insert(build, &mov->instr);
+
+   return &mov->dest.dest.ssa;
+}
+
+/**
+ * Construct an fmov or imov that reswizzles the source's components.
+ */
+static inline nir_ssa_def *
+nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
+            unsigned num_components, bool use_fmov)
+{
+   nir_alu_src alu_src = { NIR_SRC_INIT };
+   alu_src.src = nir_src_for_ssa(src);
+   for (unsigned i = 0; i < num_components; i++)
+      alu_src.swizzle[i] = swiz[i];
+
+   return use_fmov ? nir_fmov_alu(build, alu_src, num_components) :
+                     nir_imov_alu(build, alu_src, num_components);
+}
+
+static inline nir_ssa_def *
+nir_channel(nir_builder *b, nir_ssa_def *def, unsigned c)
+{
+   unsigned swizzle[4] = {c, c, c, c};
+   return nir_swizzle(b, def, swizzle, 1, false);
+}
+
+/**
+ * Turns a nir_src into a nir_ssa_def * so it can be passed to
+ * nir_build_alu()-based builder calls.
+ *
+ * See nir_ssa_for_alu_src() for alu instructions.
+ */
+static inline nir_ssa_def *
+nir_ssa_for_src(nir_builder *build, nir_src src, int num_components)
+{
+   if (src.is_ssa && src.ssa->num_components == num_components)
+      return src.ssa;
+
+   nir_alu_src alu = { NIR_SRC_INIT };
+   alu.src = src;
+   for (int j = 0; j < 4; j++)
+      alu.swizzle[j] = j;
+
+   return nir_imov_alu(build, alu, num_components);
+}
+
+/**
+ * Similar to nir_ssa_for_src(), but for alu src's, respecting the
+ * nir_alu_src's swizzle.
+ */
+static inline nir_ssa_def *
+nir_ssa_for_alu_src(nir_builder *build, nir_alu_instr *instr, unsigned srcn)
+{
+   static uint8_t trivial_swizzle[4] = { 0, 1, 2, 3 };
+   nir_alu_src *src = &instr->src[srcn];
+   unsigned num_components = nir_ssa_alu_instr_src_components(instr, srcn);
+
+   if (src->src.is_ssa && (src->src.ssa->num_components == num_components) &&
+       !src->abs && !src->negate &&
+       (memcmp(src->swizzle, trivial_swizzle, num_components) == 0))
+      return src->src.ssa;
+
+   return nir_imov_alu(build, *src, num_components);
+}
+
+static inline nir_ssa_def *
+nir_load_var(nir_builder *build, nir_variable *var)
+{
+   const unsigned num_components = glsl_get_vector_elements(var->type);
+
+   nir_intrinsic_instr *load =
+      nir_intrinsic_instr_create(build->shader, nir_intrinsic_load_var);
+   load->num_components = num_components;
+   load->variables[0] = nir_deref_var_create(load, var);
+   nir_ssa_dest_init(&load->instr, &load->dest, num_components, NULL);
+   nir_builder_instr_insert(build, &load->instr);
+   return &load->dest.ssa;
+}
+
+static inline void
+nir_store_var(nir_builder *build, nir_variable *var, nir_ssa_def *value,
+              unsigned writemask)
+{
+   const unsigned num_components = glsl_get_vector_elements(var->type);
+
+   nir_intrinsic_instr *store =
+      nir_intrinsic_instr_create(build->shader, nir_intrinsic_store_var);
+   store->num_components = num_components;
+   store->const_index[0] = writemask;
+   store->variables[0] = nir_deref_var_create(store, var);
+   store->src[0] = nir_src_for_ssa(value);
+   nir_builder_instr_insert(build, &store->instr);
+}
+
+static inline nir_ssa_def *
+nir_load_system_value(nir_builder *build, nir_intrinsic_op op, int index)
+{
+   nir_intrinsic_instr *load = nir_intrinsic_instr_create(build->shader, op);
+   load->num_components = nir_intrinsic_infos[op].dest_components;
+   load->const_index[0] = index;
+   nir_ssa_dest_init(&load->instr, &load->dest,
+                     nir_intrinsic_infos[op].dest_components, NULL);
+   nir_builder_instr_insert(build, &load->instr);
+   return &load->dest.ssa;
+}
+
+#endif /* NIR_BUILDER_H */