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  1. Qt
  2. QTBUG-116076

qHash(qfloat16(x), seed) != qHash(float(x), seed) unless seed == 0

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    • 2
    • c86cf385d (dev), 2d4db1bff (6.5), 3a9bbf235 (6.6), 6da6a17de (dev), e8fb761f7 (6.6), eb5be509d (6.5), 0f19cafc3 (dev), 8e14e13c1 (6.6), 3974778dc (6.5), fdfbb6106 (6.5.3), 096a11225 (6.6.0)
    • Foundation Sprint 90

    Description

      I see in my tests (will link to this issue when uploading to Gerrit) that qHash(qfloat16(-42.f), seed) != qHash(-42.f, seed) (unless seed is 0, then they're the same), on platforms that don't exhibit QTBUG-116064, at least.

      Expectation would be, like in the epic, that equal values produce equal hash values.

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          is cloned by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-116077 Inconsistent hashing between different FP types

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-116064 [REG SiC 6.4 -> 6.5] qHash(qfloat16(x)) is now ambiguous on GCC13

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          For Gerrit Dashboard: QTBUG-116076
          # Subject Branch Project Status CR V
          496753,3 tst_QHashFunctions: extend the consistency() test with int/FP types dev qt/qtbase Status: MERGED +2 0
          497081,2 tst_QHashFunctions: extend the consistency() test with int/FP types 6.6 qt/qtbase Status: MERGED +2 0
          497082,2 tst_QHashFunctions: extend the consistency() test with int/FP types 6.5 qt/qtbase Status: MERGED +2 0
          503188,4 Fix qHash(qfloat16) to match Qt 6.4 behavior dev qt/qtbase Status: MERGED +2 0
          503546,2 Fix qHash(qfloat16) to match Qt 6.4 behavior 6.6 qt/qtbase Status: MERGED +2 0
          503577,2 Fix qHash(qfloat16) to match Qt 6.4 behavior 6.5 qt/qtbase Status: MERGED +2 0
          504567,3 [docs] Fix \since for qHash(qfloat16) dev qt/qtbase Status: MERGED +2 0
          505193,2 [docs] Fix \since for qHash(qfloat16) 6.6 qt/qtbase Status: MERGED +2 0
          505395,2 [docs] Fix \since for qHash(qfloat16) 6.6.0 qt/qtbase Status: MERGED +2 0
          505396,2 [docs] Fix \since for qHash(qfloat16) 6.5 qt/qtbase Status: MERGED +2 0
          505438,2 [docs] Fix \since for qHash(qfloat16) 6.5.3 qt/qtbase Status: MERGED +2 0

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              mmutz Marc Mutz
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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                Updated:
                Resolved: