stillwater-sc / universal / 26343438988
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feat(ereal): refactor subtraction.cpp to standard test pattern (#945) (#963)

* feat(ereal): refactor subtraction.cpp to standard test pattern

Mirror the structure established by addition.cpp (PR #943/#958/#960)
onto subtraction.cpp per Epic #944.

Single-operator focus: every test exercises subtraction (`-`/`-=`) only.
Setup may use `+=` or constructors to build inputs.

REGRESSION_LEVEL coverage:

  LEVEL 1 (foundational):
    Algebraic invariants:
      - Anti-commutativity:  a - b == -(b - a)
      - Identity:            a - 0 == a
      - Self-cancellation:   a - a == 0
      - Sign reversal:       0 - a == -a
      - Round-trip:          (a - b) + b == a
      - Catastrophic cancellation:  a - (a - epsilon) recovers epsilon
      - Mixed-magnitude expansion:  (a + tiny) - a == tiny
    Hostile arithmetic:
      - Round-to-even tie at 2^53 + 1
      - Massive exponent gap (1e+300 - 1e-300)
      - Complete overlap (A - A) for multi-limb A
    Subnormal boundary:
      - Subnormal subtrahend
      - DBL_MIN-scale residual recovery
    IEEE 754 specials:
      - NaN - finite, finite - NaN
      - +/-Inf - finite, finite - +/-Inf  (both orderings)
      - +Inf - +Inf == NaN, -Inf - -Inf == NaN
      - +Inf - (-Inf) == +Inf, -Inf - +Inf == -Inf
      - +0 - +0, +0 - -0  (signed-zero rules)

  LEVEL 2 (fuzz x1k), 3 (x100k), 4 (x10M):
    Property fuzzer over random multi-component expansions, fixed
    seed for reproducibility. Properties:
      - Anti-commutativity
      - Identity (a - 0 == a)
      - Self-cancellation
      - Sign reversal
      - Round-trip ((a - b) + b == a)

Sub-issue surfaced: -0 - +0 returns +0 instead of -0 in current ereal
(filed as #962). The test case is left in the file behind
EREAL_TEST_ISSUE_962 so re-enabling is a one-line edit once fixed.

Validated: gcc-debug + clang-debug both PASS at LEVEL 1 + 2 + 3
(foundational + fuzz x1k + fuzz x100k).

Resolves #945

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthro... (continued)

47277 of 56302 relevant lines covered (83.97%)

5258485.53 hits per line

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