On Mon, 18 Sep 2023, Jakub Jelinek wrote:
> Perhaps we should add some initial hammer approach for the pragma, like > if you ever use the pragma to turn it somewhere off, it is turned off > globally, or ditto per function. Might be far easier than trying to > make it precise that contraction is allowed in this expression and not in > this subexpression of that etc. Of course, making it precise is the > ultimate goal. When implementing -ffp-contract=standard I looked into implementing the pragma (in a precise manner) and I didn't get the impression it would be hard to implement for C. But I was somewhat discouraged by the lack of front-end maintainers reaction to the patch implementing the =standard, so I didn't pursue that. The hardest part would be popping the pragma state when leaving a block, which didn't seem difficult (at least for C). Alexander
