[0029] Clarify Rounding and Denorm behavior for Coopvec functions #564
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
tex3d
reviewed
Jul 16, 2025
| > conversion rules | ||
| > [here](https://microsoft.github.io/hlsl-specs/specs/hlsl.html#Conv). | ||
| Float to integer conversion is RTNE (round to nearest even) and saturating. | ||
| Integer to float conversion is RTNE. Given the diverse hardware used in |
There was a problem hiding this comment.
For integer to float, what is the overflow behavior when the integer value is out-of-range of the selected float value? Is it saturating, or does it generate +/-INF? Or is it implementation defined?
There was a problem hiding this comment.
It is implementation defined. Ideally that would be INF, but since we aren't specing out INF/NAN behavior due to varying hardware, this would be partial specifying INF generation which I think will make it more confusing.
tex3d
reviewed
Jul 16, 2025
| guaranteed to be supported on all implementations can be found in | ||
| [Minimum Support Set]. | ||
|
|
||
| See [Conversion Rules] for rounding and denorm behavior. |
There was a problem hiding this comment.
Missing [Conversion Rules] link elsewhere (see how [Minimum Support Set] above is linked).
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Implements #449 #448 and #437.
Updated the spec with:
Rounding: Round to Nearest Even #448
Denorm: Implementation defined #449
Upconversion: Not intended behavior but allowed to support older hardware #437
These rules apply to all coopvec functions.