[all-commits] [llvm/llvm-project] 9fdb5e: [APFloat] Properly implement next for DoubleAPFloat

[David Majnemer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9fdb5e1fef223c777d9cdf2f6d5eaffb33c59b0d
      https://github.com/llvm/llvm-project/commit/9fdb5e1fef223c777d9cdf2f6d5eaffb33c59b0d
  Author: David Majnemer <david.majnemer at gmail.com>
  Date:   2025-08-01 (Fri, 01 Aug 2025)

  Changed paths:
    M llvm/lib/Support/APFloat.cpp
    M llvm/unittests/ADT/APFloatTest.cpp

  Log Message:
  -----------
  [APFloat] Properly implement next for DoubleAPFloat

Rather than converting to the legacy 106-bit format, perform next() on the
low APFloat. Of course, we need to renormalize the two APFloats if
either of the two constraints are violated:
1. abs(low) <= ulp(high)/2
2. high = rtne(high + low)

Should renormalization be needed, it will increment the high component
and set low to the smallest value which obeys these rules.



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