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Re: The use of register keyword in bash source code
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From: |
Andreas Schwab |
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Subject: |
Re: The use of register keyword in bash source code |
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Date: |
Wed, 06 Feb 2019 14:27:33 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1.91 (gnu/linux) |
On Feb 06 2019, Peng Yu <pengyu.ut@gmail.com> wrote:
> I see many variables are declared with the "register" keyword. I know
> its purpose is to tell compile always access the corresponding memory
> without assuming the previously accessed values are preserved. This is
> usually to deal with some external devices.
No, that is what volatile means. The register keyword is just an
optimisation hint, and is mostly ignored by the compiler.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
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