spirv: handle AMD_gcn_shader extended instructions

Co-authored-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Schürmann <daniel.schuermann@campus.tu-berlin.de>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/nir/meson.build

@@ -189,6 +189,7 @@ files_libnir = files(
   '../spirv/spirv_info.h',
   '../spirv/spirv_to_nir.c',
   '../spirv/vtn_alu.c',
+  '../spirv/vtn_amd.c',
   '../spirv/vtn_cfg.c',
   '../spirv/vtn_glsl450.c',
   '../spirv/vtn_private.h',

src/compiler/shader_info.h

@@ -53,6 +53,11 @@ struct spirv_supported_capabilities {
    bool subgroup_vote;
 };
 
+/* The supported extensions which add extended instructions */
+struct spirv_supported_extensions {
+   bool AMD_gcn_shader;
+};
+
 typedef struct shader_info {
    const char *name;
 

src/compiler/spirv/nir_spirv.h

@@ -59,6 +59,7 @@ struct spirv_to_nir_options {
    bool lower_workgroup_access_to_offsets;
 
    struct spirv_supported_capabilities caps;
+   struct spirv_supported_extensions exts;
 
    struct {
       void (*func)(void *private_data,

src/compiler/spirv/spirv_to_nir.c

@@ -373,6 +373,9 @@ vtn_handle_extension(struct vtn_builder *b, SpvOp opcode,
       struct vtn_value *val = vtn_push_value(b, w[1], vtn_value_type_extension);
       if (strcmp((const char *)&w[2], "GLSL.std.450") == 0) {
          val->ext_handler = vtn_handle_glsl450_instruction;
+      } else if ((strcmp((const char *)&w[2], "SPV_AMD_gcn_shader") == 0)
+                && (b->options && b->options->exts.AMD_gcn_shader)) {
+         val->ext_handler = vtn_handle_amd_gcn_shader_instruction;
       } else {
          vtn_fail("Unsupported extension");
       }

src/compiler/spirv/vtn_amd.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright © 2018 Valve Corporation
+ * Copyright © 2017 Red Hat
+ *
+ * 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 "vtn_private.h"
+#include "GLSL.ext.AMD.h"
+
+bool
+vtn_handle_amd_gcn_shader_instruction(struct vtn_builder *b, uint32_t ext_opcode,
+                                      const uint32_t *w, unsigned count)
+{
+   const struct glsl_type *dest_type =
+                           vtn_value(b, w[1], vtn_value_type_type)->type->type;
+   struct vtn_value *val = vtn_push_value(b, w[2], vtn_value_type_ssa);
+   val->ssa = vtn_create_ssa_value(b, dest_type);
+
+   switch ((enum GcnShaderAMD)ext_opcode) {
+   case CubeFaceIndexAMD:
+      val->ssa->def = nir_cube_face_index(&b->nb, vtn_ssa_value(b, w[5])->def);
+	  break;
+   case CubeFaceCoordAMD:
+      val->ssa->def = nir_cube_face_coord(&b->nb, vtn_ssa_value(b, w[5])->def);
+      break;
+   case TimeAMD: {
+      nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(b->nb.shader,
+                                    nir_intrinsic_shader_clock);
+      nir_ssa_dest_init(&intrin->instr, &intrin->dest, 2, 32, NULL);
+      nir_builder_instr_insert(&b->nb, &intrin->instr);
+      val->ssa->def = nir_pack_64_2x32(&b->nb, &intrin->dest.ssa);
+      break;
+   }
+   default:
+      unreachable("Invalid opcode");
+   }
+   return true;
+}

src/compiler/spirv/vtn_private.h

@@ -732,4 +732,7 @@ vtn_u64_literal(const uint32_t *w)
    return (uint64_t)w[1] << 32 | w[0];
 }
 
+bool vtn_handle_amd_gcn_shader_instruction(struct vtn_builder *b, uint32_t ext_opcode,
+                                           const uint32_t *words, unsigned count);
+
 #endif /* _VTN_PRIVATE_H_ */