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go/test/codegen/rotate.go

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test: add support for code generation tests (asmcheck) The top-level test harness is modified to support a new kind of test: "asmcheck". This is meant to replace asm_test.go as an easier and more readable way to test code generation. I've added a couple of codegen tests to get initial feedback on the syntax. I've created them under a common "codegen" subdirectory, so that it's easier to run them all with "go run run.go -v codegen". The asmcheck syntax allows to insert line comments that can specify a regular expression to match in the assembly code, for multiple architectures (the testsuite will automatically build each testfile multiple times, one per mentioned architecture). Negative matches are unsupported for now, so this cannot fully replace asm_test yet. Change-Id: Ifdbba389f01d55e63e73c99e5f5449e642101d55 Reviewed-on: https://go-review.googlesource.com/97355 Run-TryBot: Giovanni Bajo <rasky@develer.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
2018-02-26 17:59:58 -07:00
// asmcheck
test/codegen: add copyright headers to new codegen files Change-Id: I9fe6572d1043ef9ee09c0925059ded554ad24c6b Reviewed-on: https://go-review.googlesource.com/98215 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-03-02 13:06:09 -07:00
// Copyright 2018 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.
test: add support for code generation tests (asmcheck) The top-level test harness is modified to support a new kind of test: "asmcheck". This is meant to replace asm_test.go as an easier and more readable way to test code generation. I've added a couple of codegen tests to get initial feedback on the syntax. I've created them under a common "codegen" subdirectory, so that it's easier to run them all with "go run run.go -v codegen". The asmcheck syntax allows to insert line comments that can specify a regular expression to match in the assembly code, for multiple architectures (the testsuite will automatically build each testfile multiple times, one per mentioned architecture). Negative matches are unsupported for now, so this cannot fully replace asm_test yet. Change-Id: Ifdbba389f01d55e63e73c99e5f5449e642101d55 Reviewed-on: https://go-review.googlesource.com/97355 Run-TryBot: Giovanni Bajo <rasky@develer.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
2018-02-26 17:59:58 -07:00
package codegen
func rot32(x uint32) uint32 {
var a uint32
a += x<<7 | x>>25 // amd64:"ROLL.*[$]7" arm:"MOVW.*@>25"
a += x<<8 + x>>24 // amd64:`ROLL.*\$8` arm:"MOVW.*@>24"
a += x<<9 ^ x>>23 // amd64:"ROLL.*\\$9" arm:"MOVW.*@>23"
return a
}
func rot64(x uint64) uint64 {
var a uint64
a += x<<7 | x>>57 // amd64:"ROL"
a += x<<8 + x>>56 // amd64:"ROL"
a += x<<9 ^ x>>55 // amd64:"ROL"
return a
}
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