nir: move to compiler/

[mesa.git] / src / glsl / nir / nir_opt_undef.c

diff --git a/src/glsl/nir/nir_opt_undef.c b/src/glsl/nir/nir_opt_undef.c
deleted file mode 100644 (file)
index 374564d..0000000
--- a/src/glsl/nir/nir_opt_undef.c
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright © 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.
- */
-
-#include "nir.h"
-
-/** @file nir_opt_undef.c
- *
- * Handles optimization of operations involving ssa_undef.  For now, we just
- * make sure that csels between undef and some other value just give the other
- * value (on the assumption that the condition's going to be choosing the
- * defined value).  This reduces work after if flattening when each side of
- * the if is defining a variable.
- *
- * Some day, we may find some use for making other operations consuming an
- * undef arg output undef, but I don't know of any cases currently.
- */
-
-static bool
-opt_undef_alu(nir_alu_instr *instr)
-{
-   if (instr->op != nir_op_bcsel && instr->op != nir_op_fcsel)
-      return false;
-
-   assert(instr->dest.dest.is_ssa);
-
-   for (int i = 1; i <= 2; i++) {
-      if (!instr->src[i].src.is_ssa)
-         continue;
-
-      nir_instr *parent = instr->src[i].src.ssa->parent_instr;
-      if (parent->type != nir_instr_type_ssa_undef)
-         continue;
-
-      /* We can't just use nir_alu_src_copy, because we need the def/use
-       * updated.
-       */
-      nir_instr_rewrite_src(&instr->instr, &instr->src[0].src,
-                            instr->src[i == 1 ? 2 : 1].src);
-      nir_alu_src_copy(&instr->src[0], &instr->src[i == 1 ? 2 : 1],
-                       ralloc_parent(instr));
-
-      nir_src empty_src;
-      memset(&empty_src, 0, sizeof(empty_src));
-      nir_instr_rewrite_src(&instr->instr, &instr->src[1].src, empty_src);
-      nir_instr_rewrite_src(&instr->instr, &instr->src[2].src, empty_src);
-      instr->op = nir_op_imov;
-
-      return true;
-   }
-
-   return false;
-}
-
-static bool
-opt_undef_block(nir_block *block, void *data)
-{
-   bool *progress = data;
-
-   nir_foreach_instr_safe(block, instr) {
-      if (instr->type == nir_instr_type_alu)
-         if (opt_undef_alu(nir_instr_as_alu(instr)))
-             (*progress) = true;
-   }
-
-   return true;
-}
-
-bool
-nir_opt_undef(nir_shader *shader)
-{
-   bool progress = false;
-
-   nir_foreach_function(shader, function) {
-      if (function->impl) {
-         nir_foreach_block(function->impl, opt_undef_block, &progress);
-         if (progress)
-            nir_metadata_preserve(function->impl,
-                                  nir_metadata_block_index |
-                                  nir_metadata_dominance);
-      }
-   }
-
-   return progress;
-}