[dylan-lang/opendylan] e663a2: [dfmc-c-back-end] Fix generated C for infinity and...

  Branch: refs/heads/master
  Home:   https://github.com/dylan-lang/opendylan
  Commit: e663a2355d89723d51ef055100593bbbea021153
      https://github.com/dylan-lang/opendylan/commit/e663a2355d89723d51ef055100593bbbea021153
  Author: Bruce Mitchener <[email protected]>
  Date:   2015-04-30 (Thu, 30 Apr 2015)

  Changed paths:
    M sources/dfmc/c-back-end/c-emit-object.dylan

  Log Message:
  -----------
  [dfmc-c-back-end] Fix generated C for infinity and NaN values.

Fixes #876.

* sources/dfmc/c-back-end/c-emit-object.dylan
  (print-raw-object on <float>): Examine the result of float-to-string
    and generate correct C for infinite and NaN values by looking for
    the string representations that float-to-string creates.

This examines the string representation because classify-float hasn't
landed yet, and even if it had, it wouldn't be available here yet
until we'd done a release due to bootstrapping issues.

Infinite and NaN values aren't commonly present as values that need
to have C generated, but it can happen. One primary cause of this
happening is the lack of floating point exception handling in the
C back-end and run-time, so constant folding within the compiler
can result in infinite and NaN values. This will be addressed in
future work.


  Commit: be668ace1584b1e16bb2f0b71b4998dbc792d4dc
      https://github.com/dylan-lang/opendylan/commit/be668ace1584b1e16bb2f0b71b4998dbc792d4dc
  Author: Peter S. Housel <[email protected]>
  Date:   2015-04-29 (Wed, 29 Apr 2015)

  Changed paths:
    M sources/dfmc/c-back-end/c-emit-object.dylan

  Log Message:
  -----------
  Merge pull request #892 from waywardmonkeys/fix-c-back-end-float-printing

[dfmc-c-back-end] Fix generated C for infinity and NaN values.


Compare: https://github.com/dylan-lang/opendylan/compare/920bf64e55c7...be668ace1584

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