From 80858801300a2f48ad250721a79ebc7b1b0aba92 Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Thu, 20 Dec 2012 18:10:38 -0500
Subject: Remove the SNES Open Bus behaviour by default. Also simplify
 translation again.

SNES Open Bus is a quirk of the memory subsystem that allow reads of invalid addresses to return the last byte read from memory. However, it is seldom needed by a game, and it costs 1 to 3 MIPS instructions per SNES instruction to emulate.

If you need SNES Open Bus, you can remove -DNO_OPEN_BUS from the Makefile.
---
 source/globals.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'source/globals.cpp')

diff --git a/source/globals.cpp b/source/globals.cpp
index 0103f7e..f00a621 100644
--- a/source/globals.cpp
+++ b/source/globals.cpp
@@ -157,7 +157,9 @@ uint32 Work32 = 0;
 signed char Int8 = 0;
 short Int16 = 0;
 long Int32 = 0;
-unsigned char OpenBus = 0;
+#ifndef NO_OPEN_BUS
+uint8 OpenBus = 0;
+#endif
 
 
 END_EXTERN_C
-- 
cgit v1.2.3


From f29c76dc58689fe55f4ece494a0d3d44c831203f Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Mon, 24 Dec 2012 03:53:20 -0500
Subject: End the use of global variables for CPU emulation. This creates fewer
 memory store instructions in many SNES, SA1 and APU opcodes.

Fix the APU half-carry bug, which may be audible.

globals.cpp: Get rid of A1, A2, A3, A4, W1, W2, W3, W4, Int8, Int16, Int32, Work8, Work16, Work32, Ans8, Ans16, Ans32.
---
 source/globals.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'source/globals.cpp')

diff --git a/source/globals.cpp b/source/globals.cpp
index f00a621..ca2b12b 100644
--- a/source/globals.cpp
+++ b/source/globals.cpp
@@ -147,6 +147,7 @@ CMemory Memory;
 
 struct SSNESGameFixes SNESGameFixes;
 
+#if 0
 uint8 A1 = 0, A2 = 0, A3 = 0, A4 = 0, W1 = 0, W2 = 0, W3 = 0, W4 = 0;
 uint8 Ans8 = 0;
 uint16 Ans16 = 0;
@@ -157,6 +158,7 @@ uint32 Work32 = 0;
 signed char Int8 = 0;
 short Int16 = 0;
 long Int32 = 0;
+#endif
 #ifndef NO_OPEN_BUS
 uint8 OpenBus = 0;
 #endif
-- 
cgit v1.2.3


From e5869adc4469115c7eac9abf70145fc178e017de Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Wed, 26 Dec 2012 14:42:02 -0500
Subject: Merge Registers structures into their respective CPUs to avoid
 additional memory addresses being loaded every opcode.

---
 source/globals.cpp | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

(limited to 'source/globals.cpp')

diff --git a/source/globals.cpp b/source/globals.cpp
index ca2b12b..adb9ab4 100644
--- a/source/globals.cpp
+++ b/source/globals.cpp
@@ -113,20 +113,14 @@ struct SICPU ICPU;
 
 struct SCPUState CPU;
 
-struct SRegisters Registers;
-
 struct SAPU APU;
 
 struct SIAPU IAPU;
 
-struct SAPURegisters APURegisters;
-
 struct SSettings Settings;
 
 struct SDSP1 DSP1;
 
-struct SSA1Registers SA1Registers;
-
 struct SSA1 SA1;
 
 SSoundData SoundData;
@@ -361,7 +355,7 @@ struct SNetPlay NetPlay;
 #endif
 
 // Raw SPC700 instruction cycle lengths
-int32 S9xAPUCycleLengths [256] = 
+uint16 S9xAPUCycleLengths [256] = 
 {
     /*        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, */
     /* 00 */  2, 8, 4, 5, 3, 4, 3, 6, 2, 6, 5, 4, 5, 4, 6, 8, 
@@ -384,7 +378,7 @@ int32 S9xAPUCycleLengths [256] =
 
 // Actual data used by CPU emulation, will be scaled by APUReset routine
 // to be relative to the 65c816 instruction lengths.
-int32 S9xAPUCycles [256] =
+uint16 S9xAPUCycles [256] =
 {
     /*        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, */
     /* 00 */  2, 8, 4, 5, 3, 4, 3, 6, 2, 6, 5, 4, 5, 4, 6, 8, 
-- 
cgit v1.2.3


From 6b36e79013d4c9273a96a9783a2bccdb516f174a Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Thu, 27 Dec 2012 18:02:03 -0500
Subject: Speed up rendering by an unknown amount.

gfx.cpp, others: Avoid always checking for Settings.SixteenBit if FOREVER_16_BIT is defined.

port.h: Define FOREVER_16_BIT below PIXEL_FORMAT.
---
 source/globals.cpp | 1 -
 1 file changed, 1 deletion(-)

(limited to 'source/globals.cpp')

diff --git a/source/globals.cpp b/source/globals.cpp
index adb9ab4..c804318 100644
--- a/source/globals.cpp
+++ b/source/globals.cpp
@@ -228,7 +228,6 @@ uint32 HIGH_BITS_SHIFTED_TWO_MASK = 0;
 uint32 current_graphic_format = RGB565;
 #endif
 
-uint8 GetBank = 0;
 struct SCheatData Cheat;
 
 volatile SoundStatus so;
-- 
cgit v1.2.3