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Short-circuit evaluation of ? : operator for varying tests.

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? : now short-circuits evaluation of the expressions following
the boolean test for varying test types.  (It already did this
for uniform tests).

Issue #169.
This commit is contained in:
Matt Pharr
2012-02-01 11:03:58 -08:00
parent fdb4eaf437
commit 89cb809922
6 changed files with 175 additions and 13 deletions
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12
docs/ispc.rst
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@@ -1151,6 +1151,7 @@ in C:
* Structs and arrays
* Support for recursive function calls
* Support for separate compilation of source files
* "Short-circuit" evaluation of ``||``, ``&&`` and ``? :`` operators
* The preprocessor
``ispc`` adds a number of features from C++ and C99 to this base:
@@ -1968,11 +1969,12 @@ operator also work as expected.
(*fp).a = 0;
fp->b = 1;
As in C and C++, evaluation of the ``||`` and ``&&`` logical operators is
"short-circuited"; the right hand side won't be evaluated if the value from
the left-hand side determines the logical operator's value. For example,
in the following code, ``array[index]`` won't be evaluated for values of
``index`` that are greater than or equal to ``NUM_ITEMS``.
As in C and C++, evaluation of the ``||`` and ``&&`` logical operators as
well as the selection operator ``? :`` is "short-circuited"; the right hand
side won't be evaluated if the value from the left-hand side determines the
logical operator's value. For example, in the following code,
``array[index]`` won't be evaluated for values of ``index`` that are
greater than or equal to ``NUM_ITEMS``.
::