From a602cb058013fa9904b2cc715b6f3a23f54cd9b6 Mon Sep 17 00:00:00 2001
From: SarahW <pcem@pcem-emulator.co.uk>
Date: Sat, 16 Dec 2017 17:26:42 +0000
Subject: [PATCH] Tweaked recompiler block lookup. Fixes massive slowdown seen
 on some Windows 9x installations at startup & possibly some other slowdowns.

---
 src/codegen.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/codegen.h b/src/codegen.h
index 3a8a955..c5ad1ed 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -84,8 +84,12 @@ static inline codeblock_t *codeblock_tree_find(uint32_t phys, uint32_t _cs)
         while (block)
         {
                 if (a == block->cmp)
-                        break;
-                else if (a < block->cmp)
+                {
+                        if (!((block->status ^ cpu_cur_status) & CPU_STATUS_FLAGS) &&
+                             ((block->status & cpu_cur_status & CPU_STATUS_MASK) == (cpu_cur_status & CPU_STATUS_MASK)))
+                                break;
+                }
+                if (a < block->cmp)
                         block = block->left;
                 else
                         block = block->right;