On Thursday, 9 October 2014 at 12:37:20 UTC, Etienne wrote:
I'm a bit new to the inline assembler, I'm trying to use the
`movdqu` operation to move a 128 bit double quadword from a
pointer location into another location like this:
align(16) union __m128i { ubyte[16] data };
void store(__m128i* src, __m128i* dst) {
asm { movdqu [dst], src; }
}
The compiler complains about a "bad type/size of operands
'movdqu'", but these two data segments are 16 byte align so
they should be in an XMM# register? Is there something I'm
missing here?
I know virtually nothing about SSE, but you can't move directly
from memory to memory, can you? You need go through a register,
no?
This compiles:
align(16) union __m128i { ubyte[16] data; } /* note the position
of the semicolon */
void store(__m128i* src, __m128i* dst) {
asm
{
movdqu XMM0, [src]; /* note: [src] */
movdqu [dst], XMM0;
}
}