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Document MD_INIT_BUILTINS, MD_EXPAND_BUILTIN

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From-SVN: r39516
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Bernd Schmidt 2001-02-07 10:42:15 +00:00 committed by Bernd Schmidt
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gcc/ChangeLog
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@ -3,6 +3,8 @@
* builtins.c (expand_builtin_setjmp_receiver): Emit an ASM_INPUT as
a scheduling barrier at the end.
* tm.texi (MD_INIT_BUILTINS, MD_EXPAND_BUILTIN): Document.
2001-02-07 Alexandre Oliva <aoliva@redhat.com>
* config/sh/sh.md (reload_outsf): Removed.

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gcc/tm.texi
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@ -8377,4 +8377,33 @@ converting code to conditional execution in the basic blocks
A C expression to cancel any machine dependent modifications in
converting code to conditional execution in the basic blocks
@code{TEST_BB}, @code{THEN_BB}, @code{ELSE_BB}, and @code{JOIN_BB}.
@findex MD_INIT_BUILTINS
@item MD_INIT_BUILTINS
Define this macro if you have any machine-specific builtin functions that
need to be defined. It should be a C expression that performs the
necessary setup.
Machine specific builtins can be useful to expand special machine
instructions that would otherwise not normally be generated because
they have no equivalent in the source language (for example, SIMD vector
instructions or prefetch instructions).
To create a builtin function, call the function @code{builtin_function}
which is defined by the language frontend. You can use any type nodes set
up by @code{build_common_tree_nodes} and @code{build_common_tree_nodes_2};
only language frontends that use these two functions will use
@samp{MD_INIT_BUILTINS}.
@findex MD_EXPAND_BUILTIN
@item MD_EXPAND_BUILTIN(@var{exp}, @var{target}, @var{subtarget}, @var{mode}, @var{ignore})
Expand a call to a machine specific builtin that was set up by
@samp{MD_INIT_BUILTINS}. @var{exp} is the expression for the function call;
the result should go to @var{target} if that is convenient, and have mode
@var{mode} if that is convenient. @var{subtarget} may be used as the target
for computing one of @var{exp}'s operands. @var{ignore} is nonzero if the value
is to be ignored.
This macro should return the result of the call to the builtin.
@end table