agx: Stub NIR backend compiler

A fork of the Bifrost compiler, tailored to AGX. nir_register support is
removed, as I want to use an SSA-based allocator for AGX. (There are no
VLIW-like requirements and extremely limited vector semantics, so we can
use an ACO approach with ease.)

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10582>

src/asahi/compiler/agx_print.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io>
+ * Copyright (C) 2019-2020 Collabora, Ltd.
+ *
+ * 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 "agx_compiler.h"
+
+void
+agx_print_instr(agx_instr *I, FILE *fp)
+{
+   /* Stub */
+}
+
+void
+agx_print_block(agx_block *block, FILE *fp)
+{
+   fprintf(fp, "block%u {\n", block->name);
+
+   agx_foreach_instr_in_block(block, ins)
+      agx_print_instr(ins, fp);
+
+   fprintf(fp, "}");
+
+   if (block->successors[0]) {
+      fprintf(fp, " -> ");
+
+      agx_foreach_successor(block, succ)
+         fprintf(fp, "block%u ", succ->name);
+   }
+
+   if (block->predecessors->entries) {
+      fprintf(fp, " from");
+
+      agx_foreach_predecessor(block, pred)
+         fprintf(fp, " block%u", pred->name);
+   }
+
+   fprintf(fp, "\n\n");
+}
+
+void
+agx_print_shader(agx_context *ctx, FILE *fp)
+{
+   agx_foreach_block(ctx, block)
+      agx_print_block(block, fp);
+}