Hi, I noticed you're a new user, so in that spirit this is not the kind of comment that is well-received on HN. It reads as arrogant and condescending, though I

Hi, I noticed you're a new user, so in that spirit this is not the kind of comment that is well-received on HN. It reads as arrogant and condescending, though I assume that was not your intention. Since I publish regularly in this area, the condescension feels especially off-base. To answer the question in good faith: while the documentation clearly states that fast-math can reduce accuracy, in isolation the accuracy changes are often small, and moreover in isolation the accuracy changes often look positive. So I was surprised, when evaluating Herbie, that it frequently caused large, negative changes in accuracy, specifically by undoing changes made to improve accuracy.