* Re:Re: help with MMX and inline asm (all ok)
@ 2004-04-09 9:09 Andrea Pretto
2004-04-09 13:54 ` Ian Lance Taylor
0 siblings, 1 reply; 2+ messages in thread
From: Andrea Pretto @ 2004-04-09 9:09 UTC (permalink / raw)
To: gcc-help
All ok
----------------------------------------------------
#include <stdio.h>
//file: mmx.c
// gcc -o mmx -Wall -mmmx mmx.c ( it run also without
-mmmx flag)
int main ( void ){
int v[2] = { 5, 8};
int t[2] = { 6, 17};
int r[2] = { 0, 0};
printf("V: %i %i\n",v[0], v[1]);
printf("T: %i %i\n",t[0], t[1]);
printf("R: %i %i\n",r[0], r[1]);
asm (
"movq %0 , %%mm1\n\t"
"movq %1 , %%mm0\n\t"
"paddd %%mm0, %%mm1\n\t"
"movq %%mm1, %2\n\t"
:"=m" (v[0]) // %0 first array
:"m" (t[0]), // %1 second array
"m" (r[0]) // %2 result
);
printf("\n\nV: %i %i\n",v[0], v[1]);
printf("T: %i %i\n",t[0], t[1]);
printf("R: %i %i\n",r[0], r[1]);
return 0;
}
-----------------------------------------------
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: help with MMX and inline asm (all ok)
2004-04-09 9:09 Re:Re: help with MMX and inline asm (all ok) Andrea Pretto
@ 2004-04-09 13:54 ` Ian Lance Taylor
0 siblings, 0 replies; 2+ messages in thread
From: Ian Lance Taylor @ 2004-04-09 13:54 UTC (permalink / raw)
To: Andrea Pretto; +Cc: gcc-help
This works also, with no inline assembler. With -mmx it generates
paddd. Without -mmx it does the vector addition using ordinary x86
instructions.
Ian
#include <stdio.h>
#include <string.h>
//file: mmx.c
// gcc -o mmx -Wall -mmmx mmx.c ( it run also without -mmmx flag)
typedef int v2si __attribute__ ((vector_size (8)));
int main ( void ){
int v[2] = { 5, 8};
int t[2] = { 6, 17};
int r[2] = { 0, 0};
v2si rv;
printf("V: %i %i\n",v[0], v[1]);
printf("T: %i %i\n",t[0], t[1]);
printf("R: %i %i\n",r[0], r[1]);
rv = *(v2si *) &v[0] + *(v2si *) &t[0];
memcpy (&r, &rv, sizeof r);
printf("\n\nV: %i %i\n",v[0], v[1]);
printf("T: %i %i\n",t[0], t[1]);
printf("R: %i %i\n",r[0], r[1]);
return 0;
}
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2004-04-09 9:09 Re:Re: help with MMX and inline asm (all ok) Andrea Pretto
2004-04-09 13:54 ` Ian Lance Taylor
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