From f18c0f46b9aabbbb7fc71cdbd308b6523adcb759 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Wed, 12 Jan 2011 15:59:41 +0200
Subject: [PATCH] drc: don't read readmem_dword to r0 or on dummy reads

---
 libpcsxcore/new_dynarec/assem_arm.c   | 38 +++++++++++++--------------
 libpcsxcore/new_dynarec/new_dynarec.c |  8 +++---
 2 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/libpcsxcore/new_dynarec/assem_arm.c b/libpcsxcore/new_dynarec/assem_arm.c
index a22c3c0f..b6b856a6 100644
--- a/libpcsxcore/new_dynarec/assem_arm.c
+++ b/libpcsxcore/new_dynarec/assem_arm.c
@@ -2563,14 +2563,11 @@ do_readstub(int n)
     rth=get_reg(i_regmap,rt1[i]|64);
     rt=get_reg(i_regmap,rt1[i]);
   }
-#ifdef PCSX
-  if(rt<0)
-    // assume forced dummy read
-    rt=get_reg(i_regmap,-1);
-#endif
   assert(rs>=0);
-  assert(rt>=0);
   if(addr<0) addr=rt;
+  if(addr<0)
+    // assume dummy read, no alloced reg
+    addr=get_reg(i_regmap,-1);
   assert(addr>=0);
   int ftable=0;
   if(type==LOADB_STUB||type==LOADBU_STUB)
@@ -2623,19 +2620,22 @@ do_readstub(int n)
   //if((cc=get_reg(regmap,CCREG))>=0) {
   //  emit_loadreg(CCREG,cc);
   //}
-  if(type==LOADB_STUB)
-    emit_movsbl((int)&readmem_dword,rt);
-  if(type==LOADBU_STUB)
-    emit_movzbl((int)&readmem_dword,rt);
-  if(type==LOADH_STUB)
-    emit_movswl((int)&readmem_dword,rt);
-  if(type==LOADHU_STUB)
-    emit_movzwl((int)&readmem_dword,rt);
-  if(type==LOADW_STUB)
-    emit_readword((int)&readmem_dword,rt);
-  if(type==LOADD_STUB) {
-    emit_readword((int)&readmem_dword,rt);
-    if(rth>=0) emit_readword(((int)&readmem_dword)+4,rth);
+  if(itype[i]==C1LS||itype[i]==C2LS||(rt>=0&&rt1[i]!=0)) {
+    assert(rt>=0);
+    if(type==LOADB_STUB)
+      emit_movsbl((int)&readmem_dword,rt);
+    if(type==LOADBU_STUB)
+      emit_movzbl((int)&readmem_dword,rt);
+    if(type==LOADH_STUB)
+      emit_movswl((int)&readmem_dword,rt);
+    if(type==LOADHU_STUB)
+      emit_movzwl((int)&readmem_dword,rt);
+    if(type==LOADW_STUB)
+      emit_readword((int)&readmem_dword,rt);
+    if(type==LOADD_STUB) {
+      emit_readword((int)&readmem_dword,rt);
+      if(rth>=0) emit_readword(((int)&readmem_dword)+4,rth);
+    }
   }
   emit_jmp(stubs[n][2]); // return address
 }
diff --git a/libpcsxcore/new_dynarec/new_dynarec.c b/libpcsxcore/new_dynarec/new_dynarec.c
index cfdec432..f7f19c5f 100644
--- a/libpcsxcore/new_dynarec/new_dynarec.c
+++ b/libpcsxcore/new_dynarec/new_dynarec.c
@@ -2753,17 +2753,17 @@ void load_assemble(int i,struct regstat *i_regs)
   //if(c) printf("load_assemble: const=%x\n",(int)constmap[i][s]+offset);
   // FIXME: Even if the load is a NOP, we should check for pagefaults...
 #ifdef PCSX
-  if(tl<0) {
-    if(!c||(((u_int)constmap[i][s]+offset)>>16)==0x1f80) {
+  if(tl<0&&(!c||(((u_int)constmap[i][s]+offset)>>16)==0x1f80)
+    ||rt1[i]==0) {
       // could be FIFO, must perform the read
+      // ||dummy read
       assem_debug("(forced read)\n");
       tl=get_reg(i_regs->regmap,-1);
       assert(tl>=0);
-    }
   }
+#endif
   if(offset||s<0||c) addr=tl;
   else addr=s;
-#endif
   if(tl>=0) {
     //assert(tl>=0);
     //assert(rt1[i]);
-- 
2.39.2