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std: io: error: Add comment for UEFI unpacked repr use

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The following commit adds the comment explaining the rational why UEFI
uses unpacked representation on 64-bit platforms as opposed to bit-packed
representation used in all other 64-bit platforms.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>
This commit is contained in:
Ayush Singh 2025-12-16 22:27:42 +05:30
parent 95a27adcf9
commit 4efe2681f7
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1 changed files with 7 additions and 0 deletions
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7
library/std/src/io/error.rs
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@ -1,6 +1,13 @@
#[cfg(test)]
mod tests;
// On 64-bit platforms, `io::Error` may use a bit-packed representation to
// reduce size. However, this representation assumes that error codes are
// always 32-bit wide.
//
// This assumption is invalid on 64-bit UEFI, where error codes are 64-bit.
// Therefore, the packed representation is explicitly disabled for UEFI
// targets, and the unpacked representation must be used instead.
#[cfg(all(target_pointer_width = "64", not(target_os = "uefi")))]
mod repr_bitpacked;
#[cfg(all(target_pointer_width = "64", not(target_os = "uefi")))]