FA-15995 / Floating-point arithmetic / Member archive

Encoding flushes signed zero to positive zero · case 05

Encoding flushes signed zero to positive zero.

Member previewVariant 5 · 3 implementations · 14 checks per implementation

Case contract

Encode finite exactly represented dyadic x into sign/4-bit-exponent/3-bit-fraction toy float with bias 7, gradual underflow, round-to-nearest-even and infinity overflow. Return the unsigned byte. The miniature format is stipulated, not a hardware conformance claim.

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
negative zero	`0`	`128`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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