MAINT Remove all -Woverflow warnings #24919
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This removes the -Woverflow warnings observed when building scikit-learn. RAND_R_MAX is the max value for uint8, incrementing it causes an overflow (hence the warning). Elements were originally mentioned but seem to have been left unreviewed, see: scikit-learn#13422 (comment) I think this commit fixes the implementation, yet I comes with a backwards incompatible results and tests for implementation relying on `our_rand_r` fails because results are now different. I see several alternatives to remove the warning while having tests pass - preferred solution: adapt the test suite using the new results so that all tests pass and acknowledge the change of behavior for impacted user-facing APIs in the change-log - accept the quirk of this implementation but hardcode and rename the effective constant - silent the -Woverflow warning by another mean Relates to: scikit-learn#13422 scikit-learn#24895
jjerphan
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For reference, the Xorshift implementation is shown on Wikipedia:https://en.wikipedia.org/wiki/Xorshift. Additional discussions are made in the Numerical Recipes: http://numerical.recipes/ I still don't get:
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I opened #24955 that fixes the overflow. |
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Closed as it has been superseded by #24955 which has been merged. |
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Reference Issues/PRs
Towards #24875 for
-WoverflowRelates to #13422 and #24895
What does this implement/fix? Explain your changes.
This removes the -Woverflow warnings observed when building scikit-learn.
RAND_R_MAXis the max value for uint8, incrementing it causes an overflow (hence the warning).I think this commit fixes the implementation, yet I comes with a backwards incompatible results and tests for implementation relying on
our_rand_rfails because results are now different.I see several alternatives to remove the warning while having tests pass:
-Woverflowwarning by another meanAny other comments?
Any other alternative one can think of?
@glemaitre and I, have been capilotracting ourselves on finding the reason of using the modulo as the source linked for the 32bit XorShift generator does not mention.
Any memory @ClemDoum?