[Bug 17200] A demoscene sound only demo (invisible.exe) consumes a way too many CPU cycles

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=17200


Jeff Zaroyko <jeffz at jeffz.name> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1




--- Comment #5 from Jeff Zaroyko <jeffz at jeffz.name>  2010-06-15 22:14:38 ---
Confirming with Wine 1.2-rc3.  On my Intel Core 2 Quad @ 2.4GHz what I can see
is maybe 10 seconds or so into the music CPU usage starts to hover around
20-24%.  Comparing to Windows Vista on a Core 2 Duo @ 2.53Ghz it hardly goes
above 10-11%.

Looking at the results of oprofile I suspect it's our naive implementation of
_CIcos.  The application calls it a lot, we call MSVCRT_cos which calls libm
cos.  I tried replacing this behavior with inline assembly using fcos, but it
was hardly improved, maybe a better optimised version would suit?  If so _CIsin
could probably be improved in a similar manner.

samples  %        image name               symbol name
25055    45.4150  anon (tgid:8086 range:0x434000-0x4d6000) (no symbols)
15759    28.5650  libm-2.7.so              cos
3348      6.0686  libm-2.7.so              sin
2101      3.8083  msvcrt.dll.so            MSVCRT_cos
1802      3.2663  ntdll.dll.so             NTDLL__ftol
1298      2.3528  msvcrt.dll.so            _CIcos
921       1.6694  libc-2.7.so              finite
902       1.6350  msvcrt.dll.so            __i686.get_pc_thunk.bx
808       1.4646  msvcrt.dll.so            MSVCRT_sin
777       1.4084  msvcrt.dll.so            .plt
766       1.3885  libasound.so.2.0.0       (no symbols)
696       1.2616  msvcrt.dll.so            _CIsin
169       0.3063  anon (tgid:8086 range:0x0-0x110000) (no symbols)
78        0.1414  libm-2.7.so              __ieee754_pow
35        0.0634  vmlinux                  cache_estimate
35        0.0634  vmlinux                  may_open
34        0.0616  dsound.dll.so            convert_16_to_16
27        0.0489  dsound.dll.so            mix16

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