1 files changed, 0 insertions, 130 deletions
diff --git a/src/glsl/nir/nir_opt_remove_phis.c b/src/glsl/nir/nir_opt_remove_phis.c
deleted file mode 100644
index 6461837..0000000
--- a/src/glsl/nir/nir_opt_remove_phis.c
+++ /dev/null
@@ -1,130 +0,0 @@
-/*
- * Copyright © 2015 Connor Abbott
- *
- * 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.
- *
- * Authors:
- *    Connor Abbott (cwabbott0@gmail.com)
- *
- */
-
-#include "nir.h"
-
-/*
- * This is a pass for removing phi nodes that look like:
- * a = phi(b, b, b, ...)
- *
- * Note that we can't ignore undef sources here, or else we may create a
- * situation where the definition of b isn't dominated by its uses. We're
- * allowed to do this since the definition of b must dominate all of the
- * phi node's predecessors, which means it must dominate the phi node as well
- * as all of the phi node's uses. In essence, the phi node acts as a copy
- * instruction. b can't be another phi node in the same block, since the only
- * time when phi nodes can source other phi nodes defined in the same block is
- * at the loop header, and in that case one of the sources of the phi has to
- * be from before the loop and that source can't be b.
- */
-
-static bool
-remove_phis_block(nir_block *block, void *state)
-{
-   bool *progress = state;
-
-   nir_foreach_instr_safe(block, instr) {
-      if (instr->type != nir_instr_type_phi)
-         break;
-
-      nir_phi_instr *phi = nir_instr_as_phi(instr);
-
-      nir_ssa_def *def = NULL;
-      bool srcs_same = true;
-
-      nir_foreach_phi_src(phi, src) {
-         assert(src->src.is_ssa);
-
-         /* For phi nodes at the beginning of loops, we may encounter some
-          * sources from backedges that point back to the destination of the
-          * same phi, i.e. something like:
-          *
-          * a = phi(a, b, ...)
-          *
-          * We can safely ignore these sources, since if all of the normal
-          * sources point to the same definition, then that definition must
-          * still dominate the phi node, and the phi will still always take
-          * the value of that definition.
-          */
-         if (src->src.ssa == &phi->dest.ssa)
-            continue;
-         
-         if (def == NULL) {
-            def  = src->src.ssa;
-         } else {
-            if (src->src.ssa != def) {
-               srcs_same = false;
-               break;
-            }
-         }
-      }
-
-      if (!srcs_same)
-         continue;
-
-      /* We must have found at least one definition, since there must be at
-       * least one forward edge.
-       */
-      assert(def != NULL);
-
-      assert(phi->dest.is_ssa);
-      nir_ssa_def_rewrite_uses(&phi->dest.ssa, nir_src_for_ssa(def));
-      nir_instr_remove(instr);
-
-      *progress = true;
-   }
-
-   return true;
-}
-
-static bool
-remove_phis_impl(nir_function_impl *impl)
-{
-   bool progress = false;
-
-   nir_foreach_block(impl, remove_phis_block, &progress);
-
-   if (progress) {
-      nir_metadata_preserve(impl, nir_metadata_block_index |
-                                  nir_metadata_dominance);
-   }
-
-   return progress;
-}
-
-bool
-nir_opt_remove_phis(nir_shader *shader)
-{
-   bool progress = false;
-
-   nir_foreach_function(shader, function)
-      if (function->impl)
-         progress = remove_phis_impl(function->impl) || progress;
-
-   return progress;
-}
-