Post a Comment On: cbloom rants

On the SPU I'm now making heavy use of a primitive op I call "memset16" ; by this I don't mean that it must be 16-byte aligned, but rather that it memsets 16-byte patterns, not individual bytes void rrSPU_MemSet16(void * ptr,qword pattern,int count) { qword * RADRESTRICT p = (qword *) ptr; char * end = ((char *)ptr + count ); while ( (char *)p end ) { *p++ = pattern; } } (and yes I know this could be faster, this is the simple version for readability). The interesting thing has been that taking a 16-byte pattern as input actually makes it way more useful than normal byte memset. I can now also memset shorts and words, floats, doubles, and vectors! So this is now the way I do any array assignments when a chunk of consecutive elements are the same. eg. instead of doing : float fval = param; float array[16]; for(int i=0;i16;i++) array[i] = fval; you do : float array[16]; qword pattern = si_from_float(fval); rrSPU_MemSet16(array,pattern,sizeof(array)); In fact it's been so handy that I'd like to have it on other platforms, at least up to U32.