diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 4ccc68b43e2..f9ac87e3f46 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -2540,10 +2540,12 @@ the compiler. It is up to the programmer to provide these sequences. @item model (@var{model-name}) @cindex function addressability on the M32R/D -Use this attribute on the M32R/D to set the addressability of an object, -and of the code generated for a function. -The identifier @var{model-name} is one of @code{small}, @code{medium}, -or @code{large}, representing each of the code models. +@cindex variable addressability on the IA-64 + +On the M32R/D, use this attribute to set the addressability of an +object, and of the code generated for a function. The identifier +@var{model-name} is one of @code{small}, @code{medium}, or +@code{large}, representing each of the code models. Small model objects live in the lower 16MB of memory (so that their addresses can be loaded with the @code{ld24} instruction), and are @@ -2558,6 +2560,14 @@ compiler will generate @code{seth/add3} instructions to load their addresses), and may not be reachable with the @code{bl} instruction (the compiler will generate the much slower @code{seth/add3/jl} instruction sequence). +On IA-64, use this attribute to set the addressability of an object. +At present, the only supported identifier for @var{model-name} is +@code{small}, indicating addressability via ``small'' (22-bit) +addresses (so that their addresses can be loaded with the @code{addl} +instruction). Caveat: such addressing is by definition not position +independent and hence this attribute must not be used for objects +defined by shared libraries. + @item far @cindex functions which handle memory bank switching On 68HC11 and 68HC12 the @code{far} attribute causes the compiler to |
