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Diffstat (limited to 'src/java/com/jogamp/gluegen/package.html')
| -rw-r--r-- | src/java/com/jogamp/gluegen/package.html | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/java/com/jogamp/gluegen/package.html b/src/java/com/jogamp/gluegen/package.html index 2b4f1fa..689fa05 100644 --- a/src/java/com/jogamp/gluegen/package.html +++ b/src/java/com/jogamp/gluegen/package.html @@ -60,13 +60,23 @@ </ul> <h5>Simple alignment arithmetic</h5> - <blockquote>remainder = offset % alignment</blockquote> - since alignment is a multiple of 2 <code>-> x % 2n == x & (2n - 1)</code><br> - <blockquote>remainder = offset & ( alignment - 1 )</blockquote> + Modulo operation, where the 2nd handles the case offset == alignment: <blockquote> - padding = (remainder > 0) ? alignment - remainder : 0 ;<br> + padding = ( alignment - ( offset % alignment ) ) % alignment ; <br> + aligned_offset = offset + padding ; + </blockquote> + Optimization utilizing alignment as a multiple of 2 <code>-> x % 2n == x & ( 2n - 1 )</code><br> + <blockquote> + remainder = offset & ( alignment - 1 ) ; <br> + padding = ( remainder > 0 ) ? alignment - remainder : 0 ;<br> + aligned_offset = offset + padding ; + </blockquote> + Without branching, using the 2nd modulo operation for the case offset == alignment: + <blockquote> + padding = ( alignment - ( offset & ( alignment - 1 ) ) ) & ( alignment - 1 ) ;<br> aligned_offset = offset + padding ; </blockquote> + See <code>com.jogamp.gluegen.cgram.types.SizeThunk.align(..)</code>. <h5>Type Size & Alignment for x86, x86_64, armv6l-32bit-eabi and Window(mingw/mingw64)</h5> Runtime query is implemented as follows: |