Auto merge of #125720 - folkertdev:optimize_for_size-ptr-rotate, r=Amanieu

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make `ptr::rotate` smaller when using `optimize_for_size`

code to reproduce https://github.com/folkertdev/optimize_for_size-slice-rotate

In the example the size of `.text` goes down from 1624 to 276 bytes.

```
> cargo size --release --features "left-std"  -- -A

slice-rotate  :
section              size        addr
.vector_table        1024         0x0
.text                1624       0x400
.rodata                 0       0xa58
.data                   0  0x20000000
.gnu.sgstubs            0       0xa60
.bss                    0  0x20000000
.uninit                 0  0x20000000
.debug_loc            591         0x0
.debug_abbrev        1452         0x0
.debug_info         10634         0x0
.debug_aranges        480         0x0
.debug_ranges        1504         0x0
.debug_str          11716         0x0
.comment               72         0x0
.ARM.attributes        56         0x0
.debug_frame         1036         0x0
.debug_line          5837         0x0
Total               36026

> cargo size --release --features "left-size"  -- -A

slice-rotate  :
section             size        addr
.vector_table       1024         0x0
.text                276       0x400
.rodata                0       0x514
.data                  0  0x20000000
.gnu.sgstubs           0       0x520
.bss                   0  0x20000000
.uninit                0  0x20000000
.debug_loc           347         0x0
.debug_abbrev        965         0x0
.debug_info         4216         0x0
.debug_aranges       168         0x0
.debug_ranges        216         0x0
.debug_str          3615         0x0
.comment              72         0x0
.ARM.attributes       56         0x0
.debug_frame         232         0x0
.debug_line          723         0x0
Total              11910
```

tracking issue: https://github.com/rust-lang/rust/issues/125612

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This commit is contained in:

bors 2024-06-17 01:45:22 +00:00

parent a99710c2f7 c4a9bf46ba

commit 0e25481a8e

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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