Bitwise: Bit Word Tri State Mask Merge Tool

Description

Merge known replacement bits into a base word.

Bit positions are usually counted from the least-significant bit, while a displayed binary string has its own left-to-right indexing convention. Masks, fields and parity predicates describe a selected region or pattern; local agreement does not validate a complete encoded record.

Merge known replacement bits into a base word.

When to use this tool

Use Bitwise: Bit Word Tri State Mask Merge when checking the stated mask, field, parity or bit-index convention.

How to use the tool and how it works

Enter base, replacement, knownMask, width. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read result. Expand result to inspect the returned fields.

Merge known replacement bits into a base word. Validate all bounded words; merged = base on clear knownMask bits and replacement on set knownMask bits, exported as exact decimal text.^[1]

Input field	Meaning and units	Accepted input
base	Base	Required. Text. Integer syntax: optional + or - and 1-128 decimal digits; leading zeros accepted. Apply the sign restriction above. Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. Word value must satisfy 0 <= value < 2^width.
replacement	Replacement	Required. Text. Integer syntax: optional + or - and 1-128 decimal digits; leading zeros accepted. Apply the sign restriction above. Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. Word value must satisfy 0 <= value < 2^width.
knownMask	Known Mask	Required. Text. Integer syntax: optional + or - and 1-128 decimal digits; leading zeros accepted. Apply the sign restriction above. Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. Word value must satisfy 0 <= value < 2^width.
width	Width under the stated bit, interval or geometry convention; apply the field-specific units and bounds.	Required. Safe integer. Fixed-word implementation domain: whole width 1-128 bits.

Output field	Interpretation	Returned shape
result	Returned calculated value or nested object under the stated output convention.	Required. Object.
result.merged	Merged	Calculated result member: string.

json

{
  "input": {
    "base": "170",
    "replacement": "85",
    "knownMask": "15",
    "width": 8
  },
  "output": {
    "result": {
      "merged": "165"
    }
  }
}

Limitations and assumptions

The known-mask assertion is supplied; no uncertainty, actual tri-state hardware or conflict resolution beyond this selection is modeled.
Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.

Alternative or Complementary methods

Choose an explicit bit order, word width and missing-position policy; use the complete record format and appropriate parsing or checksum methods for full validation.

References

Calculation and input contract: bitwise/bit-word-tri-state-mask-merge — tool.io

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