From fb99bc5f307351509ff98f60110f3e6d66e67f8d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Sch=C3=BCrmann?= <daniel@schuermann.dev>
Date: Thu, 19 Jan 2023 17:14:51 +0100
Subject: [PATCH] aco/value_numbering: clear hashmap between disconnected CFGs

There is no dominance-relationship between two disconnected CFGs,
thus no CSE is possible.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20853>
---
 src/amd/compiler/aco_opt_value_numbering.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/amd/compiler/aco_opt_value_numbering.cpp b/src/amd/compiler/aco_opt_value_numbering.cpp
index 4ce05c2572e..a780fc71811 100644
--- a/src/amd/compiler/aco_opt_value_numbering.cpp
+++ b/src/amd/compiler/aco_opt_value_numbering.cpp
@@ -489,6 +489,9 @@ value_numbering(Program* program)
          loop_headers.pop_back();
       }
 
+      if (block.logical_idom == (int)block.index)
+         ctx.expr_values.clear();
+
       if (block.logical_idom != -1)
          process_block(ctx, block);
       else