DSP: update docs for lrs/srs

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3528 8ced0084-cf51-0410-be5f-012b33b47a6e

1 files changed, 6 insertions, 13 deletions

diff --git a/Source/Core/DSPCore/Src/DspIntLoadStore.cpp b/Source/Core/DSPCore/Src/DspIntLoadStore.cpp
index 6834500cae..82bc101c66 100644
--- a/Source/Core/DSPCore/Src/DspIntLoadStore.cpp
+++ b/Source/Core/DSPCore/Src/DspIntLoadStore.cpp
@@ -26,32 +26,25 @@ namespace DSPInterpreter {
 

 // SRS @M, $(0x18+S)

 // 0010 1sss mmmm mmmm

-// Store value from register $(0x18+S) to a memory pointed by address M. 

-// (8-bit sign extended). 

-// ALTERNATIVELY: It now seems that the upper 8 bits are controlled

-// by CR, not sign extension.

-// FIXME: Perform additional operation depending on destination register.

+// Move value from register $(0x18+D) to data memory pointed by address CR[0-7] | M. 

+// That is, the upper 8 bits of the address are the bottom 8 bits from CR, and the

+// lower 8 bits are from the 8-bit immediate.

 // Note: pc+=2 in duddie's doc seems wrong

 void srs(const UDSPInstruction& opc)

 {

 	u8 reg   = ((opc.hex >> 8) & 0x7) + 0x18;

-//	u16 addr = (u16)(s16)(s8)opc.hex;

 	u16 addr = (g_dsp.r[DSP_REG_CR] << 8) | (opc.hex & 0xFF);

 	dsp_dmem_write(addr, g_dsp.r[reg]);

 }

   

 // LRS $(0x18+D), @M

 // 0010 0ddd mmmm mmmm

-// Move value from data memory pointed by address M (8-bit sign

-// extended) to register $(0x18+D). 

-// ALTERNATIVELY: It now seems that the upper 8 bits are controlled

-// by CR, not sign extension.

-// FIXME: Perform additional operation depending on destination register.

-// Note: pc+=2 in duddie's doc seems wrong

+// Move value from data memory pointed by address CR[0-7] | M to register $(0x18+D). 

+// That is, the upper 8 bits of the address are the bottom 8 bits from CR, and the

+// lower 8 bits are from the 8-bit immediate.

 void lrs(const UDSPInstruction& opc)

 {

 	u8 reg   = ((opc.hex >> 8) & 0x7) + 0x18;

-	//u16 addr = (u16)(s16)(s8)opc.hex;

 	u16 addr = (g_dsp.r[DSP_REG_CR] << 8) | (opc.hex & 0xFF);

 	g_dsp.r[reg] = dsp_dmem_read(addr);

 }