da15fe6870
The compiler handled gcargs and gclocals LSyms unusually. It generated placeholder symbols (makefuncdatasym), filled them in, and then renamed them for content-addressability. This is an important binary size optimization; the same locals information occurs over and over. This CL continues to treat these LSyms unusually, but in a slightly more explicit way, and importantly for concurrent compilation, in a way that does not require concurrent modification of Ctxt.Hash. Instead of creating gcargs and gclocals in the usual way, by creating a types.Sym and then an obj.LSym, we add them directly to obj.FuncInfo, initialize them in obj.InitTextSym, and deduplicate and add them to ctxt.Data at the end. Then the backend's job is simply to fill them in and rename them appropriately. Updates #15756 name old alloc/op new alloc/op delta Template 38.8MB ± 0% 38.7MB ± 0% -0.22% (p=0.016 n=5+5) Unicode 29.8MB ± 0% 29.8MB ± 0% ~ (p=0.690 n=5+5) GoTypes 113MB ± 0% 113MB ± 0% -0.24% (p=0.008 n=5+5) SSA 1.25GB ± 0% 1.24GB ± 0% -0.39% (p=0.008 n=5+5) Flate 25.3MB ± 0% 25.2MB ± 0% -0.43% (p=0.008 n=5+5) GoParser 31.7MB ± 0% 31.7MB ± 0% -0.22% (p=0.008 n=5+5) Reflect 78.2MB ± 0% 77.6MB ± 0% -0.80% (p=0.008 n=5+5) Tar 26.6MB ± 0% 26.3MB ± 0% -0.85% (p=0.008 n=5+5) XML 42.4MB ± 0% 41.9MB ± 0% -1.04% (p=0.008 n=5+5) name old allocs/op new allocs/op delta Template 378k ± 0% 377k ± 1% ~ (p=0.151 n=5+5) Unicode 321k ± 1% 321k ± 0% ~ (p=0.841 n=5+5) GoTypes 1.14M ± 0% 1.14M ± 0% -0.47% (p=0.016 n=5+5) SSA 9.71M ± 0% 9.67M ± 0% -0.33% (p=0.008 n=5+5) Flate 233k ± 1% 232k ± 1% ~ (p=0.151 n=5+5) GoParser 316k ± 0% 315k ± 0% -0.49% (p=0.016 n=5+5) Reflect 979k ± 0% 972k ± 0% -0.75% (p=0.008 n=5+5) Tar 250k ± 0% 247k ± 1% -0.92% (p=0.008 n=5+5) XML 392k ± 1% 389k ± 0% -0.67% (p=0.008 n=5+5) Change-Id: Idc36186ca9d2f8214b5f7720bbc27b6bb22fdc48 Reviewed-on: https://go-review.googlesource.com/40697 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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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.
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