19 Oct
2002
19 Oct
'02
7:48 a.m.
On Fri, Oct 18, 2002 at 06:47:15 +0000, Stefan Nitschke
wrote:
I used gcc 3.2 that comes with SuSE 8.1.
Today i changed the initial values to a=0.5; b=0.0000001; x=0.1; and now
-O3 works!?? Here are the results:
C: -O3 -march=pentium
user 0m11.380s
C++: -O3 -march=pentium
user 0m11.960s
BTW to my surprise today i was able to use ardour without freezing my
machine
as it always did last week. I didnt changed the system and used the same
binaries.
I never saw such a random problem on a linux box before.
-O3 with C is broken, i got an endless loop!
What gcc version? What flags did you use with C?
The test I did had the C code using a struct, and I
used the . syntax for
c++ method calls FWIW. I'l dig out the code in a min.
I think it was loop unrolling that was crappy in c++.
That would be a bad thing.
- Stefan
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