Re: [PATCH v2 5/5] Add documentation for musttail attribute

[rep.dot.nop@gmail.com]

On 24 January 2024 20:30:45 CET, Andi Kleen <ak@linux.intel.com> wrote:
>---
> gcc/doc/extend.texi | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
>diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
>index 0bc586d120e7..c68d32bed8de 100644
>--- a/gcc/doc/extend.texi
>+++ b/gcc/doc/extend.texi
>@@ -9867,6 +9867,22 @@ foo (int x, int y)
> @code{y} is not actually incremented and the compiler can but does not
> have to optimize it to just @code{return 42 + 42;}.
> 
>+@cindex @code{musttail} statement attribute
>+@item musttail
>+
>+The @code{gnu::musttail} or @code{clang::hottail} attribute

AFAICS this patchset does not handle hottail ?

thanks,

>+can be applied to a return statement that returns the value
>+of a call to indicate that the call must be a tail call
>+that does not allocate extra stack space.
>+
>+@smallexample
>+[[gnu::musttail]] return foo();
>+@end smallexample
>+
>+If the compiler cannot generate a tail call it will generate
>+an error. Tail calls generally require enabling optimization.
>+On some targets they may not be supported.
>+
> @end table
> 
> @node Attribute Syntax