On Mon, 18 Sep 2023, Florian Weimer wrote:
> Okay, you meant “changing the result” as in “changing the result in a > permitted way”. Sorry, was confused. So this is a bad example all > around. Are there better ones (that don't involve FMA)? If you're looking for something similar to your original example, I can suggest 'x + x + x + x' -> '4 * x' under -frounding-math (i.e. not assuming default rounding mode) or 'x + x + x + x + x + x' -> '6 * x' for default rounding. I don't have a "somewhat practical" example off-hand, since apart from FMA fused operations are rarely available in instruction sets. Alexander
