From: Xiaodong Liu Date: Thu, 19 May 2022 12:01:10 +0000 (+0800) Subject: runtime: support memclr/memmove for linux/loong64 X-Git-Tag: go1.19beta1~176 X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=2a5114f49af42c1df293e64841b28c22a84211f0;p=gostls13.git runtime: support memclr/memmove for linux/loong64 Contributors to the loong64 port are: Weining Lu Lei Wang Lingqin Gong Xiaolin Zhao Meidan Li Xiaojuan Zhai Qiyuan Pu Guoqi Chen This port has been updated to Go 1.15.6: https://github.com/loongson/go Updates #46229 Change-Id: I7c1f39670034db6714630d479bc41b6620ba2b1a Reviewed-on: https://go-review.googlesource.com/c/go/+/368079 TryBot-Result: Gopher Robot Reviewed-by: David Chase Run-TryBot: Ian Lance Taylor Auto-Submit: Ian Lance Taylor Reviewed-by: Ian Lance Taylor --- diff --git a/src/runtime/memclr_loong64.s b/src/runtime/memclr_loong64.s new file mode 100644 index 0000000000..e4f20587b7 --- /dev/null +++ b/src/runtime/memclr_loong64.s @@ -0,0 +1,41 @@ +// Copyright 2022 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 "go_asm.h" +#include "textflag.h" + +// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) +TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16 + MOVV ptr+0(FP), R6 + MOVV n+8(FP), R7 + ADDV R6, R7, R4 + + // if less than 8 bytes, do one byte at a time + SGTU $8, R7, R8 + BNE R8, out + + // do one byte at a time until 8-aligned + AND $7, R6, R8 + BEQ R8, words + MOVB R0, (R6) + ADDV $1, R6 + JMP -4(PC) + +words: + // do 8 bytes at a time if there is room + ADDV $-7, R4, R7 + + SGTU R7, R6, R8 + BEQ R8, out + MOVV R0, (R6) + ADDV $8, R6 + JMP -4(PC) + +out: + BEQ R6, R4, done + MOVB R0, (R6) + ADDV $1, R6 + JMP -3(PC) +done: + RET diff --git a/src/runtime/memmove_loong64.s b/src/runtime/memmove_loong64.s new file mode 100644 index 0000000000..b7b9c56627 --- /dev/null +++ b/src/runtime/memmove_loong64.s @@ -0,0 +1,105 @@ +// Copyright 2022 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" + +// See memmove Go doc for important implementation constraints. + +// func memmove(to, from unsafe.Pointer, n uintptr) +TEXT runtime·memmove(SB), NOSPLIT|NOFRAME, $0-24 + MOVV to+0(FP), R4 + MOVV from+8(FP), R5 + MOVV n+16(FP), R6 + BNE R6, check + RET + +check: + SGTU R4, R5, R7 + BNE R7, backward + + ADDV R4, R6, R9 // end pointer + + // if the two pointers are not of same alignments, do byte copying + SUBVU R5, R4, R7 + AND $7, R7 + BNE R7, out + + // if less than 8 bytes, do byte copying + SGTU $8, R6, R7 + BNE R7, out + + // do one byte at a time until 8-aligned + AND $7, R4, R8 + BEQ R8, words + MOVB (R5), R7 + ADDV $1, R5 + MOVB R7, (R4) + ADDV $1, R4 + JMP -6(PC) + +words: + // do 8 bytes at a time if there is room + ADDV $-7, R9, R6 // R6 is end pointer-7 + + SGTU R6, R4, R8 + BEQ R8, out + MOVV (R5), R7 + ADDV $8, R5 + MOVV R7, (R4) + ADDV $8, R4 + JMP -6(PC) + +out: + BEQ R4, R9, done + MOVB (R5), R7 + ADDV $1, R5 + MOVB R7, (R4) + ADDV $1, R4 + JMP -5(PC) +done: + RET + +backward: + ADDV R6, R5 // from-end pointer + ADDV R4, R6, R9 // to-end pointer + + // if the two pointers are not of same alignments, do byte copying + SUBVU R9, R5, R7 + AND $7, R7 + BNE R7, out1 + + // if less than 8 bytes, do byte copying + SGTU $8, R6, R7 + BNE R7, out1 + + // do one byte at a time until 8-aligned + AND $7, R9, R8 + BEQ R8, words1 + ADDV $-1, R5 + MOVB (R5), R7 + ADDV $-1, R9 + MOVB R7, (R9) + JMP -6(PC) + +words1: + // do 8 bytes at a time if there is room + ADDV $7, R4, R6 // R6 is start pointer+7 + + SGTU R9, R6, R8 + BEQ R8, out1 + ADDV $-8, R5 + MOVV (R5), R7 + ADDV $-8, R9 + MOVV R7, (R9) + JMP -6(PC) + +out1: + BEQ R4, R9, done1 + ADDV $-1, R5 + MOVB (R5), R7 + ADDV $-1, R9 + MOVB R7, (R9) + JMP -5(PC) +done1: + RET