stillwater-sc / universal / 22545334166

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Commit Message

feat(dfixpnt): new decimal fixpnt type (#528)

* feat(fixpnt): new decimal fixed-point type

* feat(dfixpnt): blockdecimal refactor and decimal fixed-point type

Refactor blockdecimal from a thin blockdigit alias into a standalone
class backed by blockbinary with BCD/BID/DPD encoding support.  Build
the new dfixpnt<ndigits,radix,encoding,arithmetic,bt> decimal
fixed-point type on top of it with sign-magnitude storage, full
arithmetic (add, sub, mul, div), string I/O, and Modulo/Saturate
overflow policies.

Shared infrastructure:
- decimal_encoding.hpp: shared DecimalEncoding enum (BCD, BID, DPD)
- decimal_bits.hpp: bcd_bits(), bid_bits(), dpd_bits() helpers
- dfloat_fwd.hpp updated to use shared enum

New dfixpnt type files:
- dfixpnt_impl.hpp, dfixpnt_fwd.hpp, dfixpnt.hpp umbrella
- exceptions, numeric_limits, attributes, manipulators, mathlib
- dfixpnt_traits.hpp

CMake wiring at 4 insertion points; decimal tests decoupled from
binary fixpnt build flag.  Seven test executables (api, assignment,
logic, addition, subtraction, multiplication, division) pass on
both GCC and Clang with zero regressions across fixpnt and dfloat.

* fix(blockdecimal): add signed support and blockdigit-compatible API

blockdecimal was rewritten as a standalone class but was missing the
signed arithmetic, conversion operators, free binary operators, digit
shift operators, type_tag(), and to_binary() that the blockdigit API
test expects. This restores full compatibility.

* ci: add dfixpnt to allowed conventional commit scopes

* docs(dfixpnt): add number system documentation and docs-site sidebar entry

* fix(dfixpnt): harden against overflow and fix encoding-aware display

- blockdecimal: static_assert BID encoding limited to 19 digits (uint64_t range)
- dfixpnt operator=(long long): avoid UB negating LLONG_MIN
- dfixpnt operator=(double): use std::round and clamp to max magnitude
- manipulators type_tag: use actual encoding name instead of hardcoded "BCD"
- manipulators to... (continued)

Run Details

564 of 652 new or added lines in 5 files covered. (86.5%)

2 existing lines in 1 file now uncovered.

39498 of 46887 relevant lines covered (84.24%)

6709592.89 hits per line