FA-16519 / Floating-point arithmetic / Member archive

Disabled floating exception flags trigger traps · case 04

Disabled floating exception flags trigger traps.

Member previewVariant 4 · 3 implementations · 10 checks per implementation

Case contract

Stipulated floating exception environment: apply an operation flag set, accrue sticky flags, select enabled trap by priority invalid/divzero/overflow/underflow/inexact, save prior state and clear only requested flags after reporting the trap. Inputs are valid flag names.

Why this case matters

An offline floating representation model isolates a reproducible arithmetic fault.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
sticky survives	`[["invalid"], ["inexact", "invalid"], "inexact", ["inexact", "invalid"]]`	`[["invalid"], ["inexact", "invalid"], null, ["inexact", "invalid"]]`	Failed

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