1 files changed, 144 insertions, 0 deletions
diff --git a/mesalib/src/glsl/nir/nir_worklist.c b/mesalib/src/glsl/nir/nir_worklist.c
new file mode 100644
index 000000000..a8baae937
--- /dev/null
+++ b/mesalib/src/glsl/nir/nir_worklist.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * 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:
+ *    Jason Ekstrand (jason@jlekstrand.net)
+ *
+ */
+
+#include "nir_worklist.h"
+
+void
+nir_block_worklist_init(nir_block_worklist *w, unsigned num_blocks,
+                        void *mem_ctx)
+{
+   w->size = num_blocks;
+   w->count = 0;
+   w->start = 0;
+
+   w->blocks_present = rzalloc_array(mem_ctx, BITSET_WORD,
+                                     BITSET_WORDS(num_blocks));
+   w->blocks = ralloc_array(mem_ctx, nir_block *, num_blocks);
+}
+
+void
+nir_block_worklist_fini(nir_block_worklist *w)
+{
+   ralloc_free(w->blocks_present);
+   ralloc_free(w->blocks);
+}
+
+static bool
+worklist_add_block(nir_block *block, void *w)
+{
+   nir_block_worklist_push_tail(w, block);
+
+   return true;
+}
+
+void
+nir_block_worklist_add_all(nir_block_worklist *w, nir_function_impl *impl)
+{
+   nir_foreach_block(impl, worklist_add_block, w);
+}
+
+void
+nir_block_worklist_push_head(nir_block_worklist *w, nir_block *block)
+{
+   /* Pushing a block we already have is a no-op */
+   if (BITSET_TEST(w->blocks_present, block->index))
+      return;
+
+   assert(w->count < w->size);
+
+   if (w->start == 0)
+      w->start = w->size - 1;
+   else
+      w->start--;
+
+   w->count++;
+
+   w->blocks[w->start] = block;
+   BITSET_SET(w->blocks_present, block->index);
+}
+
+nir_block *
+nir_block_worklist_peek_head(nir_block_worklist *w)
+{
+   assert(w->count > 0);
+
+   return w->blocks[w->start];
+}
+
+nir_block *
+nir_block_worklist_pop_head(nir_block_worklist *w)
+{
+   assert(w->count > 0);
+
+   unsigned head = w->start;
+
+   w->start = (w->start + 1) % w->size;
+   w->count--;
+
+   BITSET_CLEAR(w->blocks_present, w->blocks[head]->index);
+   return w->blocks[head];
+}
+
+void
+nir_block_worklist_push_tail(nir_block_worklist *w, nir_block *block)
+{
+   /* Pushing a block we already have is a no-op */
+   if (BITSET_TEST(w->blocks_present, block->index))
+      return;
+
+   assert(w->count < w->size);
+
+   w->count++;
+
+   unsigned tail = w->start = (w->start + w->count - 1) % w->size;
+
+   w->blocks[tail] = block;
+   BITSET_SET(w->blocks_present, block->index);
+}
+
+nir_block *
+nir_block_worklist_peek_tail(nir_block_worklist *w)
+{
+   assert(w->count > 0);
+
+   unsigned tail = w->start = (w->start + w->count - 1) % w->size;
+
+   return w->blocks[tail];
+}
+
+nir_block *
+nir_block_worklist_pop_tail(nir_block_worklist *w)
+{
+   assert(w->count > 0);
+
+   unsigned tail = w->start = (w->start + w->count - 1) % w->size;
+
+   w->count--;
+
+   BITSET_CLEAR(w->blocks_present, w->blocks[tail]->index);
+   return w->blocks[tail];
+}