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From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Wed, 10 Aug 2022 23:27:43 +0200
Message-ID: <CAH6eHdQ-N0kGm6VaWCzb1b7ncN6gN6AJ0nMaMtFxdM0-SgzLWA@mail.gmail.com>
Subject: Re: Checking for built-in functions from build systems
To: Luca Bacci <luca.bacci982@gmail.com>
Cc: "gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
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On Wed, 10 Aug 2022, 23:12 Luca Bacci via Gcc, <gcc@gcc.gnu.org> wrote:

>
> 1. Is inlining of built-ins dependant only on the target architecture and
> command-line arguments?
>

No, I think it can depend on the arguments to the built-in as well.


2. If the answer to 1 is yes, could a __is_builtin_inlined (func) macro be
> added to GCC? It should tell whether func is going to be substituted inline
> for the given compiler invocation


I don't think that can work for some built-ins, e.g. in a single
translation unit memcmp can be inlined for constant arguments of small
size, and not inlined for other calls.