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Where possible generate calls to runtime makechan with int arguments during compile time instead of makechan with int64 arguments. This eliminates converting arguments for calls to makechan with int64 arguments for platforms where int64 values do not fit into arguments of type int. A similar optimization for makeslice was introduced in CL golang.org/cl/27851. 386: name old time/op new time/op delta MakeChan/Byte 52.4ns ± 6% 45.0ns ± 1% -14.14% (p=0.000 n=10+10) MakeChan/Int 54.5ns ± 1% 49.1ns ± 1% -9.87% (p=0.000 n=10+10) MakeChan/Ptr 150ns ± 1% 143ns ± 0% -4.38% (p=0.000 n=9+7) MakeChan/Struct/0 49.2ns ± 2% 43.2ns ± 2% -12.27% (p=0.000 n=10+10) MakeChan/Struct/32 81.7ns ± 2% 76.2ns ± 1% -6.71% (p=0.000 n=10+10) MakeChan/Struct/40 88.4ns ± 2% 82.5ns ± 2% -6.60% (p=0.000 n=10+10) AMD64: name old time/op new time/op delta MakeChan/Byte 83.4ns ± 8% 80.8ns ± 3% ~ (p=0.171 n=10+10) MakeChan/Int 101ns ± 3% 101ns ± 2% ~ (p=0.412 n=10+10) MakeChan/Ptr 128ns ± 1% 128ns ± 1% ~ (p=0.191 n=10+10) MakeChan/Struct/0 67.6ns ± 3% 68.7ns ± 4% ~ (p=0.224 n=10+10) MakeChan/Struct/32 138ns ± 1% 139ns ± 1% ~ (p=0.185 n=10+9) MakeChan/Struct/40 154ns ± 1% 154ns ± 1% -0.55% (p=0.027 n=10+9) Change-Id: Ie854cb066007232c5e9f71ea7d6fe27e81a9c050 Reviewed-on: https://go-review.googlesource.com/55140 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
35 lines
1.3 KiB
Go
35 lines
1.3 KiB
Go
// errorcheck
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Ensure that typed non-integer, negative and to large
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// values are not accepted as size argument in make for
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// channels.
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package main
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type T chan byte
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var sink T
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func main() {
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sink = make(T, -1) // ERROR "negative buffer argument in make.*"
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sink = make(T, uint64(1<<63)) // ERROR "buffer argument too large in make.*"
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sink = make(T, 0.5) // ERROR "constant 0.5 truncated to integer"
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sink = make(T, 1.0)
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sink = make(T, float32(1.0)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, float64(1.0)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, 1.0)
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sink = make(T, float32(1.0)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, float64(1.0)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, 1+0i)
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sink = make(T, complex64(1+0i)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, complex128(1+0i)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, 1+0i)
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sink = make(T, complex64(1+0i)) // ERROR "non-integer buffer argument in make.*"
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sink = make(T, complex128(1+0i)) // ERROR "non-integer buffer argument in make.*"
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}
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