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go/src/runtime/memmove_wasm.s

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runtime: add js/wasm architecture This commit adds the js/wasm architecture to the runtime package. Currently WebAssembly has no support for threads yet, see https://github.com/WebAssembly/design/issues/1073. Because of that, there is no preemption of goroutines and no sysmon goroutine. Design doc: https://docs.google.com/document/d/131vjr4DH6JFnb-blm_uRdaC0_Nv3OUwjEY5qVCxCup4 About WebAssembly assembly files: https://docs.google.com/document/d/1GRmy3rA4DiYtBlX-I1Jr_iHykbX8EixC3Mq0TCYqbKc Updates #18892 Change-Id: I7f12d21b5180500d55ae9fd2f7e926a1731db391 Reviewed-on: https://go-review.googlesource.com/103877 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2018-03-31 15:14:17 -06:00
// 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.
#include "textflag.h"
runtime: use Go function signatures for memclr and memmove comments The function signatures in the comments used a C-like style. Using Go function signatures is cleaner. Change-Id: I1a093ed8fe5df59f3697c613cf3fce58bba4f5c1 Reviewed-on: https://go-review.googlesource.com/113876 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-05-21 04:22:00 -06:00
// func memmove(to, from unsafe.Pointer, n uintptr)
runtime: add js/wasm architecture This commit adds the js/wasm architecture to the runtime package. Currently WebAssembly has no support for threads yet, see https://github.com/WebAssembly/design/issues/1073. Because of that, there is no preemption of goroutines and no sysmon goroutine. Design doc: https://docs.google.com/document/d/131vjr4DH6JFnb-blm_uRdaC0_Nv3OUwjEY5qVCxCup4 About WebAssembly assembly files: https://docs.google.com/document/d/1GRmy3rA4DiYtBlX-I1Jr_iHykbX8EixC3Mq0TCYqbKc Updates #18892 Change-Id: I7f12d21b5180500d55ae9fd2f7e926a1731db391 Reviewed-on: https://go-review.googlesource.com/103877 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2018-03-31 15:14:17 -06:00
TEXT runtime·memmove(SB), NOSPLIT, $0-24
MOVD to+0(FP), R0
MOVD from+8(FP), R1
MOVD n+16(FP), R2
Get R0
Get R1
I64LtU
If // forward
exit_forward_64:
Block
loop_forward_64:
Loop
Get R2
I64Const $8
I64LtU
BrIf exit_forward_64
MOVD 0(R1), 0(R0)
Get R0
I64Const $8
I64Add
Set R0
Get R1
I64Const $8
I64Add
Set R1
Get R2
I64Const $8
I64Sub
Set R2
Br loop_forward_64
End
End
loop_forward_8:
Loop
Get R2
I64Eqz
If
RET
End
Get R0
I32WrapI64
I64Load8U (R1)
I64Store8 $0
Get R0
I64Const $1
I64Add
Set R0
Get R1
I64Const $1
I64Add
Set R1
Get R2
I64Const $1
I64Sub
Set R2
Br loop_forward_8
End
Else
// backward
Get R0
Get R2
I64Add
Set R0
Get R1
Get R2
I64Add
Set R1
exit_backward_64:
Block
loop_backward_64:
Loop
Get R2
I64Const $8
I64LtU
BrIf exit_backward_64
Get R0
I64Const $8
I64Sub
Set R0
Get R1
I64Const $8
I64Sub
Set R1
Get R2
I64Const $8
I64Sub
Set R2
MOVD 0(R1), 0(R0)
Br loop_backward_64
End
End
loop_backward_8:
Loop
Get R2
I64Eqz
If
RET
End
Get R0
I64Const $1
I64Sub
Set R0
Get R1
I64Const $1
I64Sub
Set R1
Get R2
I64Const $1
I64Sub
Set R2
Get R0
I32WrapI64
I64Load8U (R1)
I64Store8 $0
Br loop_backward_8
End
End
UNDEF
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