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Use const operand for ARM syscall implementation #565

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asm_const feature has been stabilized in Rust 1.82. Using const operands for inline assembly eliminates a lot of the duplicated code in the ARM syscall implementation.

This commit has been tested by running a simple application that periodically blinks and writes a message on Raspberry Pi Pico.

`asm_const` feature has been stabilized in Rust 1.82. Using const
operands for inline assembly eliminates a lot of the duplicated code in
the ARM syscall implementation.

This commit has been tested by running a simple application that
periodically blinks and writes a message on Raspberry Pi Pico.
@alevy
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alevy commented Dec 3, 2024

Note that this requires an update of the Rust version. @jrvanwhy (and others) are any significant implications for downstream users)?

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jrvanwhy commented Dec 9, 2024

Note that this requires an update of the Rust version. @jrvanwhy (and others) are any significant implications for downstream users)?

I discussed this with Lawrence, it sounds like there would be minimal impact (i.e. they would add #![feature(asm_const)] to libtock-rs when built on their toolchain).

Longer term, we may want to have a stricter MSRV policy, but this PR isn't an issue.

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