From 0265d950e618571ad09838ad1794447ee936e4cc Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Tue, 26 May 2015 20:18:47 -0400
Subject: [PATCH] arm_dyncom_thumb: Merge STR/LDR table subsets.
---
src/core/arm/dyncom/arm_dyncom_thumb.cpp | 33 ++++++++----------------
1 file changed, 11 insertions(+), 22 deletions(-)
diff --git a/src/core/arm/dyncom/arm_dyncom_thumb.cpp b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
index 08b5c0b774..cdaf214504 100644
--- a/src/core/arm/dyncom/arm_dyncom_thumb.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
@@ -189,33 +189,22 @@ tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
case 10:
case 11:
- // TODO: Format 7 and Format 8 perform the same ARM encoding, so the following could be
- // merged into a single subset, saving on the following boolean:
-
- if ((tinstr & (1 << 9)) == 0) {
- static const ARMword subset[4] = {
- 0xE7800000, // STR Rd,[Rb,Ro]
- 0xE7C00000, // STRB Rd,[Rb,Ro]
- 0xE7900000, // LDR Rd,[Rb,Ro]
- 0xE7D00000 // LDRB Rd,[Rb,Ro]
- };
-
- *ainstr = subset[(tinstr & 0x0C00) >> 10] // base
- |((tinstr & 0x0007) << (12 - 0)) // Rd
- |((tinstr & 0x0038) << (16 - 3)) // Rb
- |((tinstr & 0x01C0) >> 6); // Ro
-
- } else {
- static const ARMword subset[4] = {
+ {
+ static const ARMword subset[8] = {
+ 0xE7800000, // STR Rd,[Rb,Ro]
0xE18000B0, // STRH Rd,[Rb,Ro]
+ 0xE7C00000, // STRB Rd,[Rb,Ro]
0xE19000D0, // LDRSB Rd,[Rb,Ro]
+ 0xE7900000, // LDR Rd,[Rb,Ro]
0xE19000B0, // LDRH Rd,[Rb,Ro]
+ 0xE7D00000, // LDRB Rd,[Rb,Ro]
0xE19000F0 // LDRSH Rd,[Rb,Ro]
};
- *ainstr = subset[(tinstr & 0x0C00) >> 10] // base
- |((tinstr & 0x0007) << (12 - 0)) // Rd
- |((tinstr & 0x0038) << (16 - 3)) // Rb
- |((tinstr & 0x01C0) >> 6); // Ro
+
+ *ainstr = subset[(tinstr & 0xE00) >> 9] // base
+ |((tinstr & 0x0007) << (12 - 0)) // Rd
+ |((tinstr & 0x0038) << (16 - 3)) // Rb
+ |((tinstr & 0x01C0) >> 6); // Ro
}
break;