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Updated docs for store/load int8/int16

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Ben Harper
2011-06-26 02:02:18 +02:00
parent ae2c24c3c1
commit f830e21cfa
1 changed files with 3 additions and 2 deletions
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docs/ispc.txt
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@@ -1797,14 +1797,15 @@ and this conversion step are necessary because ``ispc`` doesn't have native
void store_to_int16(uniform int a[], uniform int offset, void store_to_int16(uniform int a[], uniform int offset,
unsigned int val) unsigned int val)
There are two things to note in these functions. First, note that these There are three things to note in these functions. First, note that these
functions take ``unsigned int`` arrays as parameters; you need functions take ``unsigned int`` arrays as parameters; you need
to cast `the ``int8_t`` and ``int16_t`` pointers from the C/C++ side to to cast `the ``int8_t`` and ``int16_t`` pointers from the C/C++ side to
``unsigned int`` when passing them to ``ispc`` code. Second, although the ``unsigned int`` when passing them to ``ispc`` code. Second, although the
arrays are passed as ``unsigned int``, in the array indexing calculation, arrays are passed as ``unsigned int``, in the array indexing calculation,
with the ``offset`` parameter, they are treated as if they were ``int8`` or with the ``offset`` parameter, they are treated as if they were ``int8`` or
``int16`` types. (i.e. the offset treated as being in terms of number of 8 ``int16`` types. (i.e. the offset treated as being in terms of number of 8
or 16-bit elements.) or 16-bit elements.) Third, note that programIndex is implicitly added
to offset.
The ``intbits()`` and ``floatbits()`` functions can be used to implement The ``intbits()`` and ``floatbits()`` functions can be used to implement
low-level floating-point bit twiddling. For example, ``intbits()`` returns low-level floating-point bit twiddling. For example, ``intbits()`` returns