From 7d322b5c6f088495cfcb39dc0c46ca5d2c94eb70 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Sun, 28 Dec 2014 12:40:51 -0500
Subject: [PATCH] dyncom: Implement USAD8/USADA8
---
.../arm/dyncom/arm_dyncom_interpreter.cpp | 54 ++++++++++++++++++-
src/core/arm/skyeye_common/armdefs.h | 1 +
src/core/arm/skyeye_common/armemu.h | 1 -
3 files changed, 53 insertions(+), 3 deletions(-)
diff --git a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
index 7306794fea..98d8252721 100644
--- a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
@@ -3287,8 +3287,28 @@ ARM_INST_PTR INTERPRETER_TRANSLATE(uqsubaddx)(unsigned int inst, int index)
{
return INTERPRETER_TRANSLATE(uqadd8)(inst, index);
}
-ARM_INST_PTR INTERPRETER_TRANSLATE(usad8)(unsigned int inst, int index) { UNIMPLEMENTED_INSTRUCTION("USAD8"); }
-ARM_INST_PTR INTERPRETER_TRANSLATE(usada8)(unsigned int inst, int index) { UNIMPLEMENTED_INSTRUCTION("USADA8"); }
+ARM_INST_PTR INTERPRETER_TRANSLATE(usada8)(unsigned int inst, int index)
+{
+ arm_inst* const inst_base = (arm_inst*)AllocBuffer(sizeof(arm_inst) + sizeof(generic_arm_inst));
+ generic_arm_inst* const inst_cream = (generic_arm_inst*)inst_base->component;
+
+ inst_base->cond = BITS(inst, 28, 31);
+ inst_base->idx = index;
+ inst_base->br = NON_BRANCH;
+ inst_base->load_r15 = 0;
+
+ inst_cream->op1 = BITS(inst, 20, 24);
+ inst_cream->op2 = BITS(inst, 5, 7);
+ inst_cream->Rm = BITS(inst, 8, 11);
+ inst_cream->Rn = BITS(inst, 0, 3);
+ inst_cream->Ra = BITS(inst, 12, 15);
+
+ return inst_base;
+}
+ARM_INST_PTR INTERPRETER_TRANSLATE(usad8)(unsigned int inst, int index)
+{
+ return INTERPRETER_TRANSLATE(usada8)(inst, index);
+}
ARM_INST_PTR INTERPRETER_TRANSLATE(usat)(unsigned int inst, int index) { UNIMPLEMENTED_INSTRUCTION("USAT"); }
ARM_INST_PTR INTERPRETER_TRANSLATE(usat16)(unsigned int inst, int index) { UNIMPLEMENTED_INSTRUCTION("USAT16"); }
ARM_INST_PTR INTERPRETER_TRANSLATE(usub16)(unsigned int inst, int index) { UNIMPLEMENTED_INSTRUCTION("USUB16"); }
@@ -6973,6 +6993,36 @@ unsigned InterpreterMainLoop(ARMul_State* state)
USAD8_INST:
USADA8_INST:
+ {
+ INC_ICOUNTER;
+
+ if (inst_base->cond == 0xE || CondPassed(cpu, inst_base->cond)) {
+ generic_arm_inst* inst_cream = (generic_arm_inst*)inst_base->component;
+
+ const u8 ra_idx = inst_cream->Ra;
+ const u32 rm_val = RM;
+ const u32 rn_val = RN;
+
+ const u8 diff1 = ARMul_UnsignedAbsoluteDifference(rn_val & 0xFF, rm_val & 0xFF);
+ const u8 diff2 = ARMul_UnsignedAbsoluteDifference((rn_val >> 8) & 0xFF, (rm_val >> 8) & 0xFF);
+ const u8 diff3 = ARMul_UnsignedAbsoluteDifference((rn_val >> 16) & 0xFF, (rm_val >> 16) & 0xFF);
+ const u8 diff4 = ARMul_UnsignedAbsoluteDifference((rn_val >> 24) & 0xFF, (rm_val >> 24) & 0xFF);
+
+ u32 finalDif = (diff1 + diff2 + diff3 + diff4);
+
+ // Op is USADA8 if true.
+ if (ra_idx != 15)
+ finalDif += cpu->Reg[ra_idx];
+
+ RD = finalDif;
+ }
+
+ cpu->Reg[15] += GET_INST_SIZE(cpu);
+ INC_PC(sizeof(generic_arm_inst));
+ FETCH_INST;
+ GOTO_NEXT_INST;
+ }
+
USAT_INST:
USAT16_INST:
USUB16_INST:
diff --git a/src/core/arm/skyeye_common/armdefs.h b/src/core/arm/skyeye_common/armdefs.h
index 5b6e5f8cd4..c7509fcb25 100644
--- a/src/core/arm/skyeye_common/armdefs.h
+++ b/src/core/arm/skyeye_common/armdefs.h
@@ -794,6 +794,7 @@ extern u8 ARMul_UnsignedSaturatedAdd8(u8, u8);
extern u16 ARMul_UnsignedSaturatedAdd16(u16, u16);
extern u8 ARMul_UnsignedSaturatedSub8(u8, u8);
extern u16 ARMul_UnsignedSaturatedSub16(u16, u16);
+extern u8 ARMul_UnsignedAbsoluteDifference(u8, u8);
#define DIFF_LOG 0
#define SAVE_LOG 0
diff --git a/src/core/arm/skyeye_common/armemu.h b/src/core/arm/skyeye_common/armemu.h
index 04c5d2e1ae..3ea14b5a31 100644
--- a/src/core/arm/skyeye_common/armemu.h
+++ b/src/core/arm/skyeye_common/armemu.h
@@ -600,7 +600,6 @@ extern ARMword ARMul_SwitchMode (ARMul_State *, ARMword, ARMword);
extern ARMword ARMul_Align (ARMul_State *, ARMword, ARMword);
extern ARMword ARMul_SwitchMode (ARMul_State *, ARMword, ARMword);
extern void ARMul_MSRCpsr (ARMul_State *, ARMword, ARMword);
-extern u8 ARMul_UnsignedAbsoluteDifference(u8, u8);
extern void ARMul_SubOverflow (ARMul_State *, ARMword, ARMword, ARMword);
extern void ARMul_AddOverflow (ARMul_State *, ARMword, ARMword, ARMword);
extern void ARMul_AddOverflowQ(ARMul_State*, ARMword, ARMword);