nir: merge some basic consecutive ifs

After trying multiple times to merge if-statements with phis
between them I've come to the conclusion that it cannot be done
without regressions. The problem is for some shaders we end up
with a whole bunch of phis for the merged ifs resulting in
increased register pressure.

So this patch just merges ifs that have no phis between them.
This seems to be consistent with what LLVM does so for radeonsi
we only see a change (although its a large change) in a single
shader.

Shader-db results i965 (SKL):

total instructions in shared programs: 13098176 -> 13098152 (<.01%)
instructions in affected programs: 1326 -> 1302 (-1.81%)
helped: 4
HURT: 0

total cycles in shared programs: 332032989 -> 332037583 (<.01%)
cycles in affected programs: 60665 -> 65259 (7.57%)
helped: 0
HURT: 4

The cycles estimates reported by shader-db for i965 seem inaccurate
as the only difference in the final code is the removal of the
redundent condition evaluations and jumps.

Also the biggest code reduction (~7%) for radeonsi was in a tomb
raider tressfx shader but for some reason this does not get merged
for i965.

Shader-db results radeonsi (VEGA):

Totals from affected shaders:
SGPRS: 232 -> 232 (0.00 %)
VGPRS: 164 -> 164 (0.00 %)
Spilled SGPRs: 59 -> 59 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 14584 -> 13520 (-7.30 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 13 -> 13 (0.00 %)
Wait states: 0 -> 0 (0.00 %)

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/compiler/nir/nir_opt_if.c

@@ -683,6 +683,98 @@ opt_if_evaluate_condition_use(nir_builder *b, nir_if *nif)
    return progress;
 }
 
+static void
+simple_merge_if(nir_if *dest_if, nir_if *src_if, bool dest_if_then,
+                bool src_if_then)
+{
+   /* Now merge the if branch */
+   nir_block *dest_blk = dest_if_then ? nir_if_last_then_block(dest_if)
+                                      : nir_if_last_else_block(dest_if);
+
+   struct exec_list *list = src_if_then ? &src_if->then_list
+                                        : &src_if->else_list;
+
+   nir_cf_list if_cf_list;
+   nir_cf_extract(&if_cf_list, nir_before_cf_list(list),
+                  nir_after_cf_list(list));
+   nir_cf_reinsert(&if_cf_list, nir_after_block(dest_blk));
+}
+
+static bool
+opt_if_merge(nir_if *nif)
+{
+   bool progress = false;
+
+   nir_block *next_blk = nir_cf_node_cf_tree_next(&nif->cf_node);
+   if (next_blk && nif->condition.is_ssa) {
+      nir_if *next_if = nir_block_get_following_if(next_blk);
+      if (next_if && next_if->condition.is_ssa) {
+
+         /* Here we merge two consecutive ifs that have the same
+          * condition e.g:
+          *
+          *   if ssa_12 {
+          *      ...
+          *   } else {
+          *      ...
+          *   }
+          *   if ssa_12 {
+          *      ...
+          *   } else {
+          *      ...
+          *   }
+          *
+          * Note: This only merges if-statements when the block between them
+          * is empty. The reason we don't try to merge ifs that just have phis
+          * between them is because this can results in increased register
+          * pressure. For example when merging if ladders created by indirect
+          * indexing.
+          */
+         if (nif->condition.ssa == next_if->condition.ssa &&
+             exec_list_is_empty(&next_blk->instr_list)) {
+
+            simple_merge_if(nif, next_if, true, true);
+            simple_merge_if(nif, next_if, false, false);
+
+            nir_block *new_then_block = nir_if_last_then_block(nif);
+            nir_block *new_else_block = nir_if_last_else_block(nif);
+
+            nir_block *old_then_block = nir_if_last_then_block(next_if);
+            nir_block *old_else_block = nir_if_last_else_block(next_if);
+
+            /* Rewrite the predecessor block for any phis following the second
+             * if-statement.
+             */
+            rewrite_phi_predecessor_blocks(next_if, old_then_block,
+                                           old_else_block,
+                                           new_then_block,
+                                           new_else_block);
+
+            /* Move phis after merged if to avoid them being deleted when we
+             * remove the merged if-statement.
+             */
+            nir_block *after_next_if_block =
+               nir_cf_node_as_block(nir_cf_node_next(&next_if->cf_node));
+
+            nir_foreach_instr_safe(instr, after_next_if_block) {
+               if (instr->type != nir_instr_type_phi)
+                  break;
+
+               exec_node_remove(&instr->node);
+               exec_list_push_tail(&next_blk->instr_list, &instr->node);
+               instr->block = next_blk;
+            }
+
+            nir_cf_node_remove(&next_if->cf_node);
+
+            progress = true;
+         }
+      }
+   }
+
+   return progress;
+}
+
 static bool
 opt_if_cf_list(nir_builder *b, struct exec_list *cf_list)
 {
@@ -697,6 +789,7 @@ opt_if_cf_list(nir_builder *b, struct exec_list *cf_list)
          progress |= opt_if_cf_list(b, &nif->then_list);
          progress |= opt_if_cf_list(b, &nif->else_list);
          progress |= opt_if_loop_terminator(nif);
+         progress |= opt_if_merge(nif);
          progress |= opt_if_simplification(b, nif);
          break;
       }