From ee5f7e99360c3d5fc5efec31464a02967bad7bb8 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 28 Jul 2013 19:19:05 +0300
Subject: [PATCH] drc: dumb detection of writes to current block

---
 cpu/sh2/compiler.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/cpu/sh2/compiler.c b/cpu/sh2/compiler.c
index f76ba43..d3eb387 100644
--- a/cpu/sh2/compiler.c
+++ b/cpu/sh2/compiler.c
@@ -3287,6 +3287,7 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
   u16 *dr_pc_base;
   u32 pc, op, tmp;
   u32 end_pc, end_literals = 0;
+  u32 lowest_mova = 0;
   struct op_data *opd;
   int next_is_delay = 0;
   int end_block = 0;
@@ -3948,8 +3949,13 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
             tmp = 0;
         }
         opd->dest = BITMASK1(SHR_R0);
-        if (tmp)
+        if (tmp) {
           opd->imm = (tmp + 2 + (op & 0xff) * 4) & ~3;
+          if (opd->imm >= base_pc) {
+            if (lowest_mova == 0 || opd->imm < lowest_mova)
+              lowest_mova = opd->imm;
+          }
+        }
         break;
       case 0x0800: // TST #imm,R0           11001000iiiiiiii
         opd->source = BITMASK1(SHR_R0);
@@ -4059,6 +4065,20 @@ void scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
   if (end_literals < end_pc)
     end_literals = end_pc;
 
+  // end_literals is used to decide to inline a literal or not
+  // XXX: need better detection if this actually is used in write
+  if (lowest_mova >= base_pc) {
+    if (lowest_mova < end_literals) {
+      dbg(1, "mova for %08x, block %08x", lowest_mova, base_pc);
+      end_literals = end_pc;
+    }
+    if (lowest_mova < end_pc) {
+      dbg(1, "warning: mova inside of blk for %08x, block %08x",
+        lowest_mova, base_pc);
+      end_literals = end_pc;
+    }
+  }
+
   *end_pc_out = end_pc;
   if (end_literals_out != NULL)
     *end_literals_out = end_literals;
-- 
2.39.2