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// 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. //go: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