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Further improve comments in libstd/panicking.rs.

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This commit is contained in:
Eduardo Sánchez Muñoz 2020-07-02 13:47:19 +02:00
parent aac2f734de
commit 0f1adc8ec8
1 changed files with 5 additions and 4 deletions
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9
src/libstd/panicking.rs
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@ -264,10 +264,11 @@ pub mod panic_count {
// (including the current one) will have `LOCAL_PANIC_COUNT`
// equal to zero, so TLS access can be avoided.
//
// A relaxed atomic load is equivalent to a normal aligned memory read
// (e.g., a `mov` instruction in x86), while a TLS access might require
// calling a non-inlinable function (such as `__tls_get_addr` when using
// the GD TLS model).
// In terms of performance, a relaxed atomic load is similar to a normal
// aligned memory read (e.g., a mov instruction in x86), but with some
// compiler optimization restrictions. On the other hand, a TLS access
// might require calling a non-inlinable function (such as `__tls_get_addr`
// when using the GD TLS model).
true
} else {
is_zero_slow_path()