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Core/DSPCore: Reorganize register layout for accessing accumulators

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(acc and ax) and product register with one read/write.

Gives a minuscule speedup of not more than 4%. In exchange, breaks all
your out-of-tree changes to dsp. Tests are not building again, yet.


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6680 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
pierre
2010-12-29 02:12:06 +00:00
parent 0059b0f44f
commit fc1db5eaa0
23 changed files with 1224 additions and 728 deletions
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14
Source/Core/DSPCore/Src/DspIntMultiplier.cpp
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@ -32,15 +32,15 @@ inline s64 dsp_get_multiply_prod(u16 a, u16 b, u8 sign)
{
s64 prod;
if ((sign == 1) && (g_dsp.r[DSP_REG_SR] & SR_MUL_UNSIGNED)) //unsigned
if ((sign == 1) && (g_dsp._r.sr & SR_MUL_UNSIGNED)) //unsigned
prod = (u32)(a * b);
else if ((sign == 2) && (g_dsp.r[DSP_REG_SR] & SR_MUL_UNSIGNED)) //mixed
else if ((sign == 2) && (g_dsp._r.sr & SR_MUL_UNSIGNED)) //mixed
prod = a * (s16)b;
else
prod = (s16)a * (s16)b; //signed
// Conditionally multiply by 2.
if ((g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY) == 0)
if ((g_dsp._r.sr & SR_MUL_MODIFY) == 0)
prod <<= 1;
return prod;
@ -95,10 +95,10 @@ void clrp(const UDSPInstruction opc)
{
zeroWriteBackLog();
g_dsp.r[DSP_REG_PRODL] = 0x0000;
g_dsp.r[DSP_REG_PRODM] = 0xfff0;
g_dsp.r[DSP_REG_PRODH] = 0x00ff;
g_dsp.r[DSP_REG_PRODM2] = 0x0010;
g_dsp._r.prod.l = 0x0000;
g_dsp._r.prod.m = 0xfff0;
g_dsp._r.prod.h = 0x00ff;
g_dsp._r.prod.m2 = 0x0010;
}
// TSTPROD