OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

extend.texi (PowerPC AltiVec Built-in Functions): Document discrepancies from motorola's documentation.

Browse Source 
2002-06-24  Aldy Hernandez  <aldyh@redhat.com>

        * doc/extend.texi (PowerPC AltiVec Built-in Functions): Document
        discrepancies from motorola's documentation.

From-SVN: r54997
This commit is contained in:
Aldy Hernandez 2002-06-25 21:29:41 +00:00 committed by Aldy Hernandez
parent 9881adffaa
commit 90989b2675
2 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2002-06-25 Aldy Hernandez <aldyh@redhat.com>
* doc/extend.texi (PowerPC AltiVec Built-in Functions): Document
discrepancies from motorola's documentation.
Tue Jun 25 21:51:13 2002 J"orn Rennecke <joern.rennecke@superh.com>
* optabs.c (expand_vector_binop, expand_vector_unop): Don't assume

19
gcc/doc/extend.texi
View File

@ -5111,6 +5111,25 @@ The following functions are made available by including
@option{-mabi=altivec}. The functions implement the functionality
described in Motorola's AltiVec Programming Interface Manual.
There are a few differences from Motorola's documentation and GCC's
implementation. Vector constants are done with curly braces (not
parentheses). Vector initializers require no casts if the vector
constant is of the same type as the variable it is initializing. The
@code{vector bool} type is deprecated and will be discontinued in
further revisions. Use @code{vector signed} instead. If @code{signed}
or @code{unsigned} is omitted, the vector type will default to
@{signed}. Lastly, all overloaded functions are implemented with macros
for the C implementation. So code the following example will not work:
@smallexample
vec_add ((vector signed int){1, 2, 3, 4}, foo);
@end smallexample
Since vec_add is a macro, the vector constant in the above example will
be treated as four different arguments. Wrap the entire argument in
parentheses for this to work. The C++ implementation does not use
macros.
@emph{Note:} Only the @code{<altivec.h>} interface is supported.
Internally, GCC uses built-in functions to achieve the functionality in
the aforementioned header file, but they are not supported and are