Hi,
Using this simple test program:
int
main (int argc, char *argv[])
{
int i;
int test[8];
__builtin_prefetch (test, 1);
for (i = 0; i < 8; i++)
{
test[i] = i;
}
return 0;
}
And compiling using gcc -S test.c, the generated .s file includes the following
assembly code:
.LCFI1:
movl %edi, -52(%rbp)
movq %rsi, -64(%rbp)
leaq -48(%rbp), %rax
prefetchw (%rax)
movl $0, -4(%rbp)
jmp .L2
.L3:
prefetchw is a 3Dnow! instruction, not available on EMT64.
--
GCC emits 3DNow!-specific instruction for __builtin_prefetch
https://launchpad.net/bugs/66702
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