Re: enabling altivec in XCode
Re: enabling altivec in XCode
- Subject: Re: enabling altivec in XCode
- From: john <email@hidden>
- Date: Tue, 1 Feb 2005 22:51:26 -0500
Hi Michael,
Your app is crashing because you haven't defined __VEC__, and hence,
the compiler didn't create the HasAltiVec() function. The purpose of
__VEC__ is to decide whether various vector operations should be
performed with java mode turned off (for G4 processors). Unless you're
sure you want that, I recommend just dumping any code you copy from the
vDSPExample code that is wrapped in the check for __VEC__.
On a side note, unless you're specifically writing altivec code, the
accelerate framework chooses the vector or scalar implementation for
you. You don't even need to enable altivec code generation.
-- John
This may be a bit off-topic, but I'd imagine there are vDSP users
here..
in the /Developer/Examples/Accelerate/vDSP/vDSPExamples/main.c
there is
#if defined(__VEC__)
...stuff
#endif
well when I compile it, it compiles and runs fine without error.
However when I created my own project, main.c :
#if defined(__VEC__)
Boolean HasAltiVec(void) {
int mib[2], gHasAltivec;
size_t len;
mib[0] = CTL_HW;
mib[1] = HW_VECTORUNIT;
len = sizeof(gHasAltivec);
sysctl(mib, 2, &gHasAltivec, &len, NULL, 0);
return (gHasAltivec != 0);
}
#endif
int main (int argc, const char * argv[]) {
// insert code here...
Boolean hasVectorUnit = HasAltiVec();
printf("Hello, World!\n %d", hasVectorUnit);
return 0;
}
I get an error
[Session started at 2005-02-01 21:12:12 -0500.]
ZeroLink: unknown symbol '_HasAltiVec'
Executable “Test_vdsp” has exited due to signal 6 (SIGABRT).
so it seems it can't find Boolean HasAltiVec(void) so I checked the
XCode settings, and I noticed the "Enable Altivec Extensions"
checkbox. Still no difference. I noticed that the vDSPExamples project
doesn't even have this setting on and it still seems to work. How do I
enable Altivec?
regards,
Michael
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