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Introduce new attribute norelax #94

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Introduce new attribute norelax #94

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34df418
Introduce new attribute `norelax`
kito-cheng Nov 7, 2024
3a3c14a
Add non-normative text to recommand compiler should apply this attrib…
kito-cheng Nov 7, 2024
55f75cf
Extend the note to say ifunc resolver should use this attribute
kito-cheng Nov 7, 2024
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21 changes: 21 additions & 0 deletions src/c-api.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -444,6 +444,27 @@ Functions declared with this attribute will use to the standard vector calling
convention variant as defined in the RISC-V psABI, even if the function has
vector arguments or a return value.

=== norelax

Supported Syntaxes:
.Supported Syntaxes:
[%autowidth]
|===
|*Style* |*Syntax*
|GNU |`+__attribute__((norelax))+`
|C++11 |`+[[riscv::norelax]]+`
|C23 |`+[[riscv::norelax]]+`
|===

Functions declared with this attribute will not be relaxed by the linker.

NOTE: This can be implemented with `.option push; .option norelax; <function-body>; .option pop`.
NOTE: The use case for this attribute is to apply it to functions that may be invoked
at a very early stage of the process, when the GP may not be initialized properly at that
moment.
NOTE: Functions used as ifunc resolvers should use this attribute. The compiler
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@cyyself cyyself Nov 13, 2024 •
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NOTE: Functions used as ifunc resolvers should use this attribute.

Should be: Functions used as ifunc resolvers and all possible ifunc resolver callees should use this attribute.

may apply this to automatically generated ifunc resolvers.

== Intrinsic Functions

Intrinsic functions (or intrinsics or built-ins) are expanded into instruction sequences by compilers.
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