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cmd/compile: parallelize another big chunk of rulegen
rulegen has a sanity check that ensures all the arch-specific opcodes are handled by each of the gen files. This is an expensive chunk of work, particularly since there are a lot of opcodes in total, and each one of them compiles and runs a regular expression. Parallelize that for each architecture, which greatly speeds up 'go run *.go' on my laptop with four real CPU cores. name old time/op new time/op delta Rulegen 3.39s ± 1% 2.53s ± 2% -25.34% (p=0.008 n=5+5) name old user-time/op new user-time/op delta Rulegen 10.6s ± 1% 11.2s ± 1% +6.09% (p=0.008 n=5+5) name old sys-time/op new sys-time/op delta Rulegen 201ms ± 7% 218ms ±17% ~ (p=0.548 n=5+5) name old peak-RSS-bytes new peak-RSS-bytes delta Rulegen 182MB ± 3% 184MB ± 3% ~ (p=0.690 n=5+5) Change-Id: Iec538ed0fa7eb867eeeeaab3da1e2615ce32cbb9 Reviewed-on: https://go-review.googlesource.com/c/go/+/195218 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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@ -392,27 +392,34 @@ func genOp() {
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// Check that the arch genfile handles all the arch-specific opcodes.
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// This is very much a hack, but it is better than nothing.
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var wg sync.WaitGroup
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for _, a := range archs {
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if a.genfile == "" {
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continue
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}
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src, err := ioutil.ReadFile(a.genfile)
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if err != nil {
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log.Fatalf("can't read %s: %v", a.genfile, err)
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}
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for _, v := range a.ops {
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pattern := fmt.Sprintf("\\Wssa[.]Op%s%s\\W", a.name, v.name)
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match, err := regexp.Match(pattern, src)
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a := a
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wg.Add(1)
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go func() {
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src, err := ioutil.ReadFile(a.genfile)
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if err != nil {
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log.Fatalf("bad opcode regexp %s: %v", pattern, err)
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log.Fatalf("can't read %s: %v", a.genfile, err)
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}
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if !match {
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log.Fatalf("Op%s%s has no code generation in %s", a.name, v.name, a.genfile)
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for _, v := range a.ops {
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pattern := fmt.Sprintf(`\Wssa\.Op%s%s\W`, a.name, v.name)
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match, err := regexp.Match(pattern, src)
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if err != nil {
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log.Fatalf("bad opcode regexp %s: %v", pattern, err)
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}
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if !match {
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log.Fatalf("Op%s%s has no code generation in %s", a.name, v.name, a.genfile)
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}
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}
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}
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wg.Done()
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}()
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}
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wg.Wait()
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}
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// Name returns the name of the architecture for use in Op* and Block* enumerations.
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