I'm trying to write a program that uses the mmx intrinsic instructions
in order to get a faster code but I'm having some problems...
The little test code is
#include <mmintrin.h>
int main(void) {
__m64 temp, soglie_minime;
unsigned char rossomin = 1;
unsigned char verdemin = 2;
unsigned char blumin = 2;
unsigned char rossomax = 3;
unsigned char verdemax = 4;
unsigned char blumax = 5;
temp = _mm_cvtsi32_si64 ( (unsigned int) (blumin << 16) + (verdemin << 8) + rossomin);
soglie_minime = _mm_slli_si64 (temp, 32);
_mm_add_si64 (temp, soglie_minime);
return 0;
}
which is compiled with gcc-3.3 -mmmx -g test.c -o test
If I run it I get illegal instruction, with gdb I see this:
14 _mm_add_si64 (temp, soglie_minime);
(gdb) step
_mm_add_si64 (__m1={131585, 0}, __m2={0, 131585}) at /usr/lib/gcc-lib/i386-linux/3.3/include/mmintrin.h:192
192 return (__m64) __builtin_ia32_paddq ((long long)__m1, (long long)__m2);
(gdb) step
Program received signal SIGILL, Illegal instruction.
0x080483e0 in _mm_add_si64 (__m1={131585, 0}, __m2={0, 131585})
at /usr/lib/gcc-lib/i386-linux/3.3/include/mmintrin.h:192
192 return (__m64) __builtin_ia32_paddq ((long long)__m1, (long long)__m2);
(gdb)
What's the meaning of it? what's wrong?
Thank you.
PS: I don't understand if I have to do
_mm_add_si64 (temp, soglie_minime); or soglie_minime = _mm_add_si64 (temp, soglie_minime);
which is correct? They both give the same error.
PPS: I don't know if it ca be interesting, my pc has got 2 athlon mp 2000.
--
Non c'è più forza nella normalità, c'è solo monotonia.
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