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Core/DSPCore: Improve Interpreter address register add/sub, convert to

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assembler for JIT. Replace JIT ToMask() with a different variant. Remove
 superfluous zeroWriteBackLog calls(added by me).
Core/Common: Don't bother creating a string and calling into a Logs trigger()
 when there is noone listening. Change AtomicLoadAcquire for gcc to just
 make the compiler not reorder memory accesses around it instead of doing
 a full memory barrier, per the comment in the win32 variant.
Core/AudioCommon: Fix a use of uninitialized variable inside libalsa.

Microbenchmarking results for ToMask variants:(1 000 000 000 iterations):
             cpu\variant| shifts | bit scan
intel mobile C2D@2.5GHz | 5.5s   | 4.0s
amd athlon64x2@3GHz     | 6.1s   | 6.4s
(including some constant overhead identical to both variants)



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6667 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
pierre
2010-12-27 15:05:18 +00:00
parent 0e737235a8
commit c33f46406e
9 changed files with 214 additions and 194 deletions
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13
Source/Core/DSPCore/Src/DSPIntUtil.h
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@ -68,10 +68,10 @@ inline u16 dsp_increase_addr_reg(u16 reg, s16 ix)
u16 m = ToMask(wr) | 1;
u16 nar = ar+ix;
if (ix >= 0) {
if((ar&m)+(ix&m) -m-1 >= 0)
if((ar&m) + (int)(ix&m) -(int)m-1 >= 0)
nar -= wr+1;
} else {
if((ar&m)+(ix&m) -m-1 < m-wr)
if((ar&m) + (int)(ix&m) -(int)m-1 < m-wr)
nar += wr+1;
}
return nar;
@ -82,13 +82,12 @@ inline u16 dsp_decrease_addr_reg(u16 reg, s16 ix)
u16 ar = g_dsp.r[reg];
u16 wr = g_dsp.r[reg+8];
u16 m = ToMask(wr) | 1;
ix = -ix-1;
u16 nar = ar+ix+1;
if (ix-1 >= 0) {
if((ar&m)+(ix&m) -m >= 0)
u16 nar = ar-ix;
if ((u16)ix > 0x8000) { // equiv: ix < 0 && ix != -0x8000
if((ar&m) - (int)(ix&m) >= 0)
nar -= wr+1;
} else {
if((ar&m)+(ix&m) -m < m-wr)
if((ar&m) - (int)(ix&m) < m-wr)
nar += wr+1;
}
return nar;