go switch 源码
golang switch 代码
文件路径：/test/codegen/switch.go
// asmcheck
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// These tests check code generation of switch statements.
package codegen
// see issue 33934
func f(x string) int {
// amd64:-`cmpstring`
switch x {
case "":
return -1
case "1", "2", "3":
return -2
default:
return -3
}
}
// use jump tables for 8+ int cases
func square(x int) int {
// amd64:`JMP\s\(.*\)\(.*\)$`
// arm64:`MOVD\s\(R.*\)\(R.*<<3\)`,`JMP\s\(R.*\)$`
switch x {
case 1:
return 1
case 2:
return 4
case 3:
return 9
case 4:
return 16
case 5:
return 25
case 6:
return 36
case 7:
return 49
case 8:
return 64
default:
return x * x
}
}
// use jump tables for 8+ string lengths
func length(x string) int {
// amd64:`JMP\s\(.*\)\(.*\)$`
// arm64:`MOVD\s\(R.*\)\(R.*<<3\)`,`JMP\s\(R.*\)$`
switch x {
case "a":
return 1
case "bb":
return 2
case "ccc":
return 3
case "dddd":
return 4
case "eeeee":
return 5
case "ffffff":
return 6
case "ggggggg":
return 7
case "hhhhhhhh":
return 8
default:
return len(x)
}
}
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