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DSP: Document in a comment what CLR15/SET15 appears to do. (unsigned multiplication)

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minor fix in op table.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3133 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard
2009-05-02 14:57:26 +00:00
parent b5ea4ef9a8
commit 732562325d
4 changed files with 35 additions and 29 deletions
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9
Source/Core/DSPCore/Src/DSPInterpreter.cpp
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@ -1452,14 +1452,13 @@ void srbith(const UDSPInstruction& opc)
g_dsp.r[DSP_REG_SR] |= SR_MUL_MODIFY;
break;
// 15-bit precision? clamping? no idea :(
// CLR15 seems to be the default.
// It seems to come around mul operation,
// If set, treat multiplicands as unsigned 16-bit ints.
// If clear, treat them as signed.
case 0xc: // CLR15
g_dsp.r[DSP_REG_SR] &= ~SR_TOP_BIT_UNK;
g_dsp.r[DSP_REG_SR] &= ~SR_MUL_UNSIGNED;
break;
case 0xd: // SET15
g_dsp.r[DSP_REG_SR] |= SR_TOP_BIT_UNK;
g_dsp.r[DSP_REG_SR] |= SR_MUL_UNSIGNED;
break;
// Automatic 40-bit sign extension when loading ACx.M.