Hello
When I compile my program with -O0 and with -O2 I have two different comportement
here the output of the program with -O0
PseudoAxesEngine : "eulerians" eulerians
"solution" : 1.0000000 [0.0000000 : 1.0000000]
"omega" : -180.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
"chi" : -90.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
"phi" : 180.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
multiply method: 0x400319e8
mu komega kappa kphi gamma delta
0 : 0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
1 : 0.000000000000000 ° -32.954835326713123 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° -32.954835326713123 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
PseudoAxesEngine : "eulerians" eulerians
"solution" : 1.0000000 [0.0000000 : 1.0000000]
"omega" : 0.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
"chi" : 90.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
"phi" : 0.0000000 ° [-180.0000000 : 180.0000000] 0x8e6c9d8
multiply method: 0x400319e8
mu komega kappa kphi gamma delta
0 : 0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
1 : 0.000000000000000 ° -32.954835326713123 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° -32.954835326713123 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
now with -O2
PseudoAxesEngine : "eulerians" eulerians
"solution" : 1.0000000 [0.0000000 : 1.0000000]
"omega" : 0.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
"chi" : 90.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
"phi" : 0.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
multiply method: 0x4002fbe0
mu komega kappa kphi gamma delta
0 : 0.000000000000000 ° -32.954835326713116 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° -32.954835326713116 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
1 : 0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
PseudoAxesEngine : "eulerians" eulerians
"solution" : 1.0000000 [0.0000000 : 1.0000000]
"omega" : -180.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
"chi" : -90.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
"phi" : 180.0000000 ° [-180.0000000 : 180.0000000] 0x951d768
multiply method: 0x4002fbe0
mu komega kappa kphi gamma delta
0 : 0.000000000000000 ° -32.954835326713116 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° -32.954835326713116 ° -134.755927383623572 ° 147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
1 : 0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
0.000000000000000 ° 32.954835326713123 ° 134.755927383623572 ° -147.045164673286877 ° 0.000000000000000 ° 0.000000000000000 °
As you can see it looks like it is similar except for values of komega.
-O0 32.954835326713123 / -32.954835326713123 (symetric ok)
-O2 32.954835326713123 / -32.954835326713116 (not symetric ko ?)
So first my question is: is it normal to have different numerical computation in O2 vs O0 ?
thanks
Frederic
PS: I am using
gcc (Debian 4.3.4-6) 4.3.4
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
on this processor
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) 4 CPU 3.20GHz
stepping : 1
cpu MHz : 3191.950
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pebs bts pni dtes64 monitor ds_cpl cid xtpr
bogomips : 6383.90
clflush size : 64
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) 4 CPU 3.20GHz
stepping : 1
cpu MHz : 3191.950
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pebs bts pni dtes64 monitor ds_cpl cid xtpr
bogomips : 6384.02
clflush size : 64
power management:
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