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The Go compiler assumes that pointers escape when passed into assembly functions. To override this behavior we can annotate assembly functions with go:noescape, telling the compiler that we know pointers do not escape from it. By annotating the assembly functions in the s390x P256 code in this way we enable more variables to be allocated on the stack rather than the heap, reducing the number of heap allocations required to execute this code: name old alloc/op new alloc/op delta SignP256 3.66kB ± 0% 2.64kB ± 0% -27.95% (p=0.008 n=5+5) VerifyP256 4.46kB ± 0% 1.23kB ± 0% -72.40% (p=0.008 n=5+5) name old allocs/op new allocs/op delta SignP256 40.0 ± 0% 31.0 ± 0% -22.50% (p=0.008 n=5+5) VerifyP256 41.0 ± 0% 24.0 ± 0% -41.46% (p=0.008 n=5+5) Change-Id: Id526c30c9b04b2ad79a55d76cab0e30cc8d60402 Reviewed-on: https://go-review.googlesource.com/66230 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Download and Install
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After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
Install From Source
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Contributing
Go is the work of hundreds of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.