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Groups > linux.kernel > #1643253
| From | Alexey Dobriyan <adobriyan@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] seq_file: delete small-value optimization |
| Date | 2017-05-17 12:40 +0200 |
| Message-ID | <tI4x4-1Sb-15@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
> Joe Perches wrote: > > On Tue, 2017-05-16 at 23:42 +0300, Alexey Dobriyan wrote: > > num_to_str() optimizes printing small integers [0..9], so the same > > check higher in callchain is unnecessary. > > Doesn't the optimization exists for the frequent use of 0 > in seq output? > > These seq_put_decimal calls are now slightly more expensive. That additional CALL instruction is hardly measurable so you're adding branch to skip branch in the next function.
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Re: [PATCH] seq_file: delete small-value optimization Alexey Dobriyan <adobriyan@gmail.com> - 2017-05-17 12:40 +0200 Re: [PATCH] seq_file: delete small-value optimization Joe Perches <joe@perches.com> - 2017-05-18 01:30 +0200
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