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| author | Emile <git@emile.space> | 2024-10-25 15:55:50 +0200 |
|---|---|---|
| committer | Emile <git@emile.space> | 2024-10-25 15:55:50 +0200 |
| commit | c90f36e3dd179d2de96f4f5fe38d8dc9a9de6dfe (patch) | |
| tree | 89e9afb41c5bf76f48cfb09305a2d3db8d302b06 /vendor/filippo.io/edwards25519/field/fe_arm64.s | |
| parent | 98bbb0f559a8883bc47bae80607dbe326a448e61 (diff) | |
Diffstat (limited to 'vendor/filippo.io/edwards25519/field/fe_arm64.s')
| -rw-r--r-- | vendor/filippo.io/edwards25519/field/fe_arm64.s | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/filippo.io/edwards25519/field/fe_arm64.s b/vendor/filippo.io/edwards25519/field/fe_arm64.s new file mode 100644 index 0000000..3126a43 --- /dev/null +++ b/vendor/filippo.io/edwards25519/field/fe_arm64.s @@ -0,0 +1,42 @@ +// 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 |
