mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-29 23:11:35 +00:00
43 lines
1.0 KiB
ArmAsm
43 lines
1.0 KiB
ArmAsm
|
// Copyright (c) 2020 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.
|
||
|
|
|
||
|
|
// +build arm64,gc,!purego
|
||
|
|
|
||
|
|
#include "textflag.h"
|
||
|
|
|
||
|
|
// carryPropagate works exactly like carryPropagateGeneric and uses the
|
||
|
|
// same AND, ADD, and LSR+MADD instructions emitted by the compiler, but
|
||
|
|
// avoids loading R0-R4 twice and uses LDP and STP.
|
||
|
|
//
|
||
|
|
// See https://golang.org/issues/43145 for the main compiler issue.
|
||
|
|
//
|
||
|
|
// func carryPropagate(v *Element)
|
||
|
|
TEXT ·carryPropagate(SB),NOFRAME|NOSPLIT,$0-8
|
||
|
|
MOVD v+0(FP), R20
|
||
|
|
|
||
|
|
LDP 0(R20), (R0, R1)
|
||
|
|
LDP 16(R20), (R2, R3)
|
||
|
|
MOVD 32(R20), R4
|
||
|
|
|
||
|
|
AND $0x7ffffffffffff, R0, R10
|
||
|
|
AND $0x7ffffffffffff, R1, R11
|
||
|
|
AND $0x7ffffffffffff, R2, R12
|
||
|
|
AND $0x7ffffffffffff, R3, R13
|
||
|
|
AND $0x7ffffffffffff, R4, R14
|
||
|
|
|
||
|
|
ADD R0>>51, R11, R11
|
||
|
|
ADD R1>>51, R12, R12
|
||
|
|
ADD R2>>51, R13, R13
|
||
|
|
ADD R3>>51, R14, R14
|
||
|
|
// R4>>51 * 19 + R10 -> R10
|
||
|
|
LSR $51, R4, R21
|
||
|
|
MOVD $19, R22
|
||
|
|
MADD R22, R10, R21, R10
|
||
|
|
|
||
|
|
STP (R10, R11), 0(R20)
|
||
|
|
STP (R12, R13), 16(R20)
|
||
|
|
MOVD R14, 32(R20)
|
||
|
|
|
||
|
|
RET
|