I did some off-the-cuff analysis of some random code a couple of years ago and found the traditional ARM constant encoding to be not as good - for that code, at

I did some off-the-cuff analysis of some random code a couple of years ago and found the traditional ARM constant encoding to be not as good - for that code, at least - as the MIPS-/POWER-style load low/or high business. So if my code is at all representative I'm not surprised they went for MOVW+MOVT in the end: https://news.ycombinator.com/item?id=11607119#11608650 https://news.ycombinator.com/item?id=11607119#11608650 Regarding the 00XY00XY and XY00XY00 forms: I'm going to have to sleep on this, but this is a bit of mystery to me so far. I'm going to have to keep an eye out for those sorts of constants now! Maybe they're actually quite common?? - I suppose this will certainly let you form many kinds of mask useful for SIMD operations.