stillwater-sc / universal / 25988762611

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Commit Message

feat: API parity / implementation for decimal string parse in specialized FP (Phase D of #835) (#850)

Phase D wraps up the remaining specialized FP family. Four types
covered, one (hfloat) explicitly deferred to a tracking issue.

posit1, posito (older posit revisions sharing posit_parse.hpp style):
  - Add nan / inf / infinity token detection (case-insensitive,
    optional sign). All non-finite spellings route to setnar() since
    posit has only one NaR encoding -- same convention as the
    current posit B2b path.
  - Fix latent bug in the stod fallback: was returning bSuccess=true
    even when istringstream extraction failed. Now properly checks
    ss.fail() and trailing-junk via !ss.eof().
  - operator>>: guard extraction (return if istr >> txt fails), set
    failbit on parse failure (alongside the existing cerr diagnostic).

unum (Type I):
  - Add nan / inf / infinity token detection. unum has no Inf
    encoding, so inf tokens collapse to NaN -- matching the existing
    operator=(double) behavior that also maps +/-inf to NaN.
  - operator>>: extraction guard + failbit, matching the B2c pattern.

bfloat16:
  - Implement parse(). Previous body was a stub that returned false
    and set value to zero, ignoring input. New implementation:
      * nan / inf / infinity token routing to setnan / setinf
      * stod fallback for decimal (bfloat16 has only 7 explicit
        mantissa bits; double precision is way more than enough)
      * ss.fail() and !ss.eof() guards reject malformed input
  - operator>>: extraction guard + failbit.

Tests (4 new files, ReportTestSuite pattern):
  - static/tapered/posit1/conversion/string_parse.cpp
  - static/tapered/posito/conversion/string_parse.cpp
  - static/float/bfloat16/conversion/string_parse.cpp
  - elastic/unum/string_parse.cpp

Each covers: canonical decimals, nan/inf token routing, operator>>
failbit, malformed-input rejection.

hfloat is NOT included -- its parse() is a stub like bfloat16's was,
but ... (continued)

Coverage Stats

66 of 70 new or added lines in 6 files covered. (94.29%)

10 existing lines in 1 file now uncovered.

46481 of 55320 relevant lines covered (84.02%)

6415245.07 hits per line