diff options
Diffstat (limited to 'Source/Core/DSPCore/Src/DSPIntCCUtil.cpp')
| -rw-r--r-- | Source/Core/DSPCore/Src/DSPIntCCUtil.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/Source/Core/DSPCore/Src/DSPIntCCUtil.cpp b/Source/Core/DSPCore/Src/DSPIntCCUtil.cpp new file mode 100644 index 0000000000..ecf49189ca --- /dev/null +++ b/Source/Core/DSPCore/Src/DSPIntCCUtil.cpp @@ -0,0 +1,181 @@ +// Copyright (C) 2003-2009 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+// Additional copyrights go to Duddie and Tratax (c) 2004
+
+
+// HELPER FUNCTIONS
+
+#include "DSPIntCCUtil.h"
+#include "DSPCore.h"
+#include "DSPInterpreter.h"
+
+namespace DSPInterpreter {
+
+void Update_SR_Register64(s64 _Value)
+{
+ g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
+
+ if (_Value < 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x8;
+ }
+
+ if (_Value == 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x4;
+ }
+
+ // weird
+ if ((_Value >> 62) == 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x20;
+ }
+}
+
+void Update_SR_Register16(s16 _Value)
+{
+ g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
+
+ if (_Value < 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x8;
+ }
+
+ if (_Value == 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x4;
+ }
+
+ // weird
+ if ((_Value >> 14) == 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= 0x20;
+ }
+}
+
+void Update_SR_LZ(s64 value) {
+
+ if (value == 0)
+ {
+ g_dsp.r[DSP_REG_SR] |= SR_LOGIC_ZERO;
+ }
+ else
+ {
+ g_dsp.r[DSP_REG_SR] &= ~SR_LOGIC_ZERO;
+ }
+
+}
+
+int GetMultiplyModifier()
+{
+ if (g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY)
+ return 1;
+ else
+ return 2;
+}
+
+inline bool isCarry() {
+ return (g_dsp.r[DSP_REG_SR] & 0x01) ? true : false;
+}
+inline bool isSign() {
+ return ((g_dsp.r[DSP_REG_SR] & 0x02) != (g_dsp.r[DSP_REG_SR] & 0x08));
+}
+
+inline bool isZero() {
+ return (g_dsp.r[DSP_REG_SR] & 0x04) ? true : false;
+}
+
+
+
+//see gdsp_registers.h for flags
+bool CheckCondition(u8 _Condition)
+{
+ bool taken = false;
+ switch (_Condition & 0xf)
+ {
+ case 0x0: //NS - NOT SIGN
+ if (! isSign())
+ taken = true;
+ break;
+
+ case 0x1: // S - SIGN
+ if (isSign())
+ taken = true;
+ break;
+
+ case 0x2: // G - GREATER
+ if (! isSign() && !isZero())
+ taken = true;
+ break;
+
+ case 0x3: // LE - LESS EQUAL
+ if (isSign() || isZero())
+ taken = true;
+ break;
+
+ case 0x4: // NZ - NOT ZERO
+
+ if (!isZero())
+ taken = true;
+ break;
+
+ case 0x5: // Z - ZERO
+
+ if (isZero())
+ taken = true;
+ break;
+
+ case 0x6: // L - LESS
+ // Should be that once we set 0x01
+ if (!isCarry())
+ // if (isSign())
+ taken = true;
+ break;
+
+ case 0x7: // GE - GREATER EQUAL
+ // Should be that once we set 0x01
+ if (isCarry())
+ // if (! isSign() || isZero())
+ taken = true;
+ break;
+
+ case 0xc: // LNZ - LOGIC NOT ZERO
+
+ if (!(g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO))
+ taken = true;
+ break;
+
+ case 0xd: // LZ - LOGIC ZERO
+
+ if (g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO)
+ taken = true;
+ break;
+
+ case 0xf: // Empty
+ taken = true;
+ break;
+
+ default:
+ ERROR_LOG(DSPLLE, "Unknown condition check: 0x%04x\n", _Condition & 0xf);
+ break;
+ }
+
+ return taken;
+}
+
+} // namespace
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