32x: drc: some constant propagation

[picodrive.git] / pico / 32x / memory.c

diff --git a/pico/32x/memory.c b/pico/32x/memory.c
index 999a060..a958737 100644 (file)
--- a/pico/32x/memory.c
+++ b/pico/32x/memory.c
@@ -341,6 +341,9 @@ static void p32x_vdp_write8(u32 a, u32 d)
         Pico32x.dirty_pal = 1;
       r[0] = (r[0] & P32XV_nPAL) | (d & 0xff);
       break;
+    case 0x03: // shift (for pp mode)
+      r[2 / 2] = d & 1;
+      break;
     case 0x05: // fill len
       r[4 / 2] = d & 0xff;
       break;
@@ -1050,8 +1053,9 @@ static int REGPARM(3) sh2_write8_cs0(u32 a, u32 d, int id)
   return sh2_write8_unmapped(a, d, id);
 }
 
+/* quirk: in both normal and overwrite areas only nonzero values go through */
 #define sh2_write8_dramN(n) \
-  if (!(a & 0x20000) || d) { \
+  if ((d & 0xff) != 0) { \
     u8 *dram = (u8 *)Pico32xMem->dram[n]; \
     dram[(a & 0x1ffff) ^ 1] = d; \
   } \
@@ -1517,8 +1521,8 @@ void PicoMemSetup32x(void)
 
   msh2.read8_map   = ssh2.read8_map   = sh2_read8_map;
   msh2.read16_map  = ssh2.read16_map  = sh2_read16_map;
-  msh2.write8_tab  = ssh2.write8_tab  = (const void **)sh2_write8_map;
-  msh2.write16_tab = ssh2.write16_tab = (const void **)sh2_write16_map;
+  msh2.write8_tab  = ssh2.write8_tab  = (const void **)(void *)sh2_write8_map;
+  msh2.write16_tab = ssh2.write16_tab = (const void **)(void *)sh2_write16_map;
 
   // setup poll detector
   m68k_poll.flag = P32XF_68KPOLL;
@@ -1527,6 +1531,11 @@ void PicoMemSetup32x(void)
   sh2_poll[0].cyc_max = 21;
   sh2_poll[1].flag = P32XF_SSH2POLL;
   sh2_poll[1].cyc_max = 16;
+
+#ifdef DRC_SH2
+  sh2_drc_mem_setup(&msh2);
+  sh2_drc_mem_setup(&ssh2);
+#endif
 }
 
 // vim:shiftwidth=2:expandtab