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Merge pull request #751 from Vsevolod-Livinskij/master

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Saturating multiplication for int64 was added.
This commit is contained in:
Ilia Filippov
2014-03-12 00:12:34 -07:00
parent e6a23a5932 dc00b4dd64
commit e1524891fc
6 changed files with 289 additions and 0 deletions
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docs/ispc.rst
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@@ -3615,6 +3615,39 @@ normalized exponent as a power of two in the ``pw2`` parameter.
uniform int * uniform pw2)
Saturating Arithmetic
---------------------
A saturation (no overflow possible) addition, substraction, multiplication and
division of all integer types is provided by the ``ispc`` standard library.
::
int8 saturating_add(uniform int8 a, uniform int8 b)
int8 saturating_add(varying int8 a, varying int8 b)
unsigned int8 saturating_add(uniform unsigned int8 a, uniform unsigned int8 b)
unsigned int8 saturating_add(varying unsigned int8 a, varying unsigned int8 b)
int8 saturating_sub(uniform int8 a, uniform int8 b)
int8 saturating_sub(varying int8 a, varying int8 b)
unsigned int8 saturating_sub(uniform unsigned int8 a, uniform unsigned int8 b)
unsigned int8 saturating_sub(varying unsigned int8 a, varying unsigned int8 b)
int8 saturating_mul(uniform int8 a, uniform int8 b)
int8 saturating_mul(varying int8 a, varying int8 b)
unsigned int8 saturating_mul(uniform unsigned int8 a, uniform unsigned int8 b)
unsigned int8 saturating_mul(varying unsigned int8 a, varying unsigned int8 b)
int8 saturating_div(uniform int8 a, uniform int8 b)
int8 saturating_div(varying int8 a, varying int8 b)
unsigned int8 saturating_div(uniform unsigned int8 a, uniform unsigned int8 b)
unsigned int8 saturating_div(varying unsigned int8 a,varying unsigned int8 b)
In addition to the ``int8`` variants of saturating arithmetic functions listed
above, there are versions that supports ``int16``, ``int32`` and ``int64``
values as well.
Pseudo-Random Numbers
---------------------