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Auto merge of #75121 - tmiasko:str-slicing, r=Mark-Simulacrum

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Avoid `unwrap_or_else` in str indexing

This provides a small reduction of generated LLVM IR, and leads to a
simpler assembly code.

Closes #68874.
This commit is contained in:
bors 2020-08-07 04:51:04 +00:00
commit 98922795f6
1 changed files with 12 additions and 3 deletions
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15
library/core/src/str/mod.rs
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@ -1923,7 +1923,10 @@ mod traits {
#[inline]
fn index(self, slice: &str) -> &Self::Output {
let (start, end) = (self.start, self.end);
self.get(slice).unwrap_or_else(|| super::slice_error_fail(slice, start, end))
match self.get(slice) {
Some(s) => s,
None => super::slice_error_fail(slice, start, end),
}
}
#[inline]
fn index_mut(self, slice: &mut str) -> &mut Self::Output {
@ -1995,7 +1998,10 @@ mod traits {
#[inline]
fn index(self, slice: &str) -> &Self::Output {
let end = self.end;
self.get(slice).unwrap_or_else(|| super::slice_error_fail(slice, 0, end))
match self.get(slice) {
Some(s) => s,
None => super::slice_error_fail(slice, 0, end),
}
}
#[inline]
fn index_mut(self, slice: &mut str) -> &mut Self::Output {
@ -2068,7 +2074,10 @@ mod traits {
#[inline]
fn index(self, slice: &str) -> &Self::Output {
let (start, end) = (self.start, slice.len());
self.get(slice).unwrap_or_else(|| super::slice_error_fail(slice, start, end))
match self.get(slice) {
Some(s) => s,
None => super::slice_error_fail(slice, start, end),
}
}
#[inline]
fn index_mut(self, slice: &mut str) -> &mut Self::Output {