Dear All, On the web there are a number of .h files that provide wrappers for mmx assembler commands. They are usually but not always called mmx.h. An example is here: http://webcvs.freedesktop.org/gstreamer/gstreamer/include/mmx.h?revision=1.2&content-type=text%2Fplain&pathrev=1.2 and: http://aggregate.org/SWAR/ars-swar.h In there, for instance, pmullw_r2r(mm1,mm3) is defined as a macro so that it can be called as if it were a C function. Actually it performs the assembler command pmullw on mmx registers 1 & 3. These header files seem to be entirely generic but as far as I can see they are not shipped in any of the debian developer packages. Does any of you use such header files? They seem a good idea. Is there a reason why they are not shipped as standard with gcc/debian? Are there similar wrappers for SSE2 commands? My processor doesn't support SSE3 or later, but information about future trends would be good to know too. I may of course be wrong in saying that such a set of macros is not normally shipped. I've grepped /usr/include and found nothing similar. There is an <asm/mmx.h> header file but it is quite different and including it doesn't seem to allow assembler functions to be used: >From the website above: Usage: let's say you want to add the 64-bit vector of two 32-bit floats at x into register 7. Unless you have declared x as "mmx_t x;" you need to cast x to the correct type. Register 7 is called "mm7". Thus: pfadd_m2r(*((mmx_t *) &x), mm7); Looking at some of the few clean examples of this being used that I can find it seems that register names such as mm7 don't need to be declared - presumably they are defined somewhere in the tree of header files. In my code: #include <asm/mmx.h> .... pmullw_r2r(mm0,mm1); Compiling, or rather failing to compile: 2008.02_try001$ gcc dot_002.c dot_002.c: In function ‘main’: dot_002.c:48: error: ‘mm0’ undeclared (first use in this function) dot_002.c:48: error: (Each undeclared identifier is reported only once dot_002.c:48: error: for each function it appears in.) dot_002.c:48: error: ‘mm1’ undeclared (first use in this function) 2008.02_try001$ Any information on this would be welcome. Regards, Max.
