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xgcl/sm/sm2/ec256/c256_asm_arm64.s
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yaole 8d97f750eb init: v1.0.0
2026-05-27 23:03:00 +08:00

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//go:build arm64 && !generic && !generic32 && !generic64
// +build arm64
// +build !generic
// +build !generic32
// +build !generic64
// 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.
// This file contains constant-time, 64-bit assembly implementation of
// c256. The optimizations performed here are described in detail in:
// S.Gueron and V.Krasnov, "Fast prime field elliptic-curve cryptography with
// 256-bit primes"
// http://link.springer.com/article/10.1007%2Fs13389-014-0090-x
// https://eprint.iacr.org/2013/816.pdf
// Copyright (c) 2018 xdx. All rights reserved.
// Written by xdx.
// sm2p256v1曲线arm64平台汇编实现。参考golang标准库。
#include "textflag.h"
#define res_ptr R0
#define a_ptr R1
#define b_ptr R2
#define acc0 R3
#define acc1 R4
#define acc2 R5
#define acc3 R6
#define acc4 R7
#define acc5 R8
#define acc6 R9
#define acc7 R10
#define t0 R11
#define t1 R12
#define t2 R13
#define t3 R14
#define const0 R15
#define const1 R16
#define hlp0 R17
#define hlp1 res_ptr
#define x0 R19
#define x1 R20
#define x2 R21
#define x3 R22
#define y0 R23
#define y1 R24
#define y2 R25
#define y3 R26
#define const2 t2
#define const3 t3
// sm2 p = 0xfffffffeffffffff ffffffffffffffff ffffffff00000000 ffffffffffffffff
// Note:
// load p to registers:
// MOVD $-1, acc0
// MOVD c256const1<>(SB), acc1
// MOVD $-1, acc2
// MOVD c256const3<>(SB), acc3
// c256const0 and c256const2 may not needed.
DATA c256const0<>+0x00(SB)/8, $0xffffffffffffffff
DATA c256const1<>+0x00(SB)/8, $0xffffffff00000000
DATA c256const2<>+0x00(SB)/8, $0xffffffffffffffff
DATA c256const3<>+0x00(SB)/8, $0xfffffffeffffffff
// k0 * ord[0] = -1 mod 2^{64}, k0 = -ord[0]^{-1} mod B
DATA c256ordK0<>+0x00(SB)/8, $0x327f9e8872350975
// N
DATA c256ord<>+0x00(SB)/8, $0x53bbf40939d54123
DATA c256ord<>+0x08(SB)/8, $0x7203df6b21c6052b
DATA c256ord<>+0x10(SB)/8, $0xffffffffffffffff
DATA c256ord<>+0x18(SB)/8, $0xfffffffeffffffff
// 1*R mod p
DATA c256one<>+0x00(SB)/8, $0x0000000000000001
DATA c256one<>+0x08(SB)/8, $0x00000000ffffffff
DATA c256one<>+0x10(SB)/8, $0x0000000000000000
DATA c256one<>+0x18(SB)/8, $0x0000000100000000
GLOBL c256const0<>(SB), 8, $8
GLOBL c256const1<>(SB), 8, $8
GLOBL c256const2<>(SB), 8, $8
GLOBL c256const3<>(SB), 8, $8
GLOBL c256ordK0<>(SB), 8, $8
GLOBL c256ord<>(SB), 8, $32
GLOBL c256one<>(SB), 8, $32
// acc[1,2,3,0] = acc[0,1,2,3] / R mod p = (acc[0,1,2,3] + acc0 * p) >> 64.
// note that acc[0,1,2,3] + acc0 * p = 0 mod 2^64.
#define montReduceQW(r0, r1, r2, r3, t0, t1) \
LSL $32, r0, t0 \
LSR $32, r0, t1 \
ADDS r0, r1, r1 \
ADCS r2, ZR, r2 \
ADCS r3, ZR, r3 \
ADCS r0, ZR, r0 \
SUBS t0, r1, r1 \
SBCS t1, r2, r2 \
SBCS t0, r3, r3 \
SBCS t1, r0, r0 \
/* ---------------------------------------*/
// func c256LittleToBig(res []byte, in []uint64)
TEXT ·c256LittleToBig(SB),NOSPLIT,$0
JMP ·c256BigToLittle(SB)
/* ---------------------------------------*/
// func c256BigToLittle(res []uint64, in []byte)
TEXT ·c256BigToLittle(SB),NOSPLIT,$0
MOVD res+0(FP), res_ptr
MOVD in+24(FP), a_ptr
LDP 0*16(a_ptr), (acc0, acc1)
LDP 1*16(a_ptr), (acc2, acc3)
REV acc0, acc0
REV acc1, acc1
REV acc2, acc2
REV acc3, acc3
STP (acc3, acc2), 0*16(res_ptr)
STP (acc1, acc0), 1*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256MovCond(res, a, b []uint64, cond int)
// If cond == 0 res=b, else res=a
TEXT ·c256MovCond(SB),NOSPLIT,$0
MOVD res+0(FP), res_ptr
MOVD a+24(FP), a_ptr
MOVD b+48(FP), b_ptr
MOVD cond+72(FP), R3
CMP $0, R3
// Two remarks:
// 1) Will want to revisit NEON, when support is better
// 2) CSEL might not be constant time on all ARM processors
LDP 0*16(a_ptr), (R4, R5)
LDP 1*16(a_ptr), (R6, R7)
LDP 2*16(a_ptr), (R8, R9)
LDP 0*16(b_ptr), (R16, R17)
LDP 1*16(b_ptr), (R19, R20)
LDP 2*16(b_ptr), (R21, R22)
CSEL EQ, R16, R4, R4
CSEL EQ, R17, R5, R5
CSEL EQ, R19, R6, R6
CSEL EQ, R20, R7, R7
CSEL EQ, R21, R8, R8
CSEL EQ, R22, R9, R9
STP (R4, R5), 0*16(res_ptr)
STP (R6, R7), 1*16(res_ptr)
STP (R8, R9), 2*16(res_ptr)
LDP 3*16(a_ptr), (R4, R5)
LDP 4*16(a_ptr), (R6, R7)
LDP 5*16(a_ptr), (R8, R9)
LDP 3*16(b_ptr), (R16, R17)
LDP 4*16(b_ptr), (R19, R20)
LDP 5*16(b_ptr), (R21, R22)
CSEL EQ, R16, R4, R4
CSEL EQ, R17, R5, R5
CSEL EQ, R19, R6, R6
CSEL EQ, R20, R7, R7
CSEL EQ, R21, R8, R8
CSEL EQ, R22, R9, R9
STP (R4, R5), 3*16(res_ptr)
STP (R6, R7), 4*16(res_ptr)
STP (R8, R9), 5*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256NegCond(val []uint64, cond int)
// iff cond != 0 val <- -val
TEXT ·c256NegCond(SB),NOSPLIT,$0
MOVD val+0(FP), a_ptr
MOVD cond+24(FP), hlp0
MOVD a_ptr, res_ptr
// acc = p
MOVD $-1, acc0
MOVD c256const1<>(SB), acc1
MOVD $-1, acc2
MOVD c256const3<>(SB), acc3
// Load the original value
LDP 0*16(a_ptr), (t0, t1)
LDP 1*16(a_ptr), (t2, t3)
// Speculatively subtract
SUBS t0, acc0
SBCS t1, acc1
SBCS t2, acc2
SBC t3, acc3
// If condition is 0, keep original value
CMP $0, hlp0
CSEL EQ, t0, acc0, acc0
CSEL EQ, t1, acc1, acc1
CSEL EQ, t2, acc2, acc2
CSEL EQ, t3, acc3, acc3
// Store result
STP (acc0, acc1), 0*16(res_ptr)
STP (acc2, acc3), 1*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256Sqr(res, in []uint64, n int)
TEXT ·c256Sqr(SB),NOSPLIT,$0
MOVD res+0(FP), res_ptr
MOVD in+24(FP), a_ptr
MOVD n+48(FP), b_ptr
LDP 0*16(a_ptr), (x0, x1)
LDP 1*16(a_ptr), (x2, x3)
sqrLoop:
SUB $1, b_ptr
CALL c256SqrInternal<>(SB)
MOVD y0, x0
MOVD y1, x1
MOVD y2, x2
MOVD y3, x3
CBNZ b_ptr, sqrLoop
STP (y0, y1), 0*16(res_ptr)
STP (y2, y3), 1*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256Mul(res, in1, in2 []uint64)
TEXT ·c256Mul(SB),NOSPLIT,$0
MOVD res+0(FP), res_ptr
MOVD in1+24(FP), a_ptr
MOVD in2+48(FP), b_ptr
LDP 0*16(a_ptr), (x0, x1)
LDP 1*16(a_ptr), (x2, x3)
LDP 0*16(b_ptr), (y0, y1)
LDP 1*16(b_ptr), (y2, y3)
CALL c256MulInternal<>(SB)
STP (y0, y1), 0*16(res_ptr)
STP (y2, y3), 1*16(res_ptr)
RET
#define minusOne acc5
/* ---------------------------------------*/
// func c256FromMont(res, in []uint64)
TEXT ·c256FromMont(SB),NOSPLIT,$0
MOVD res+0(FP), res_ptr
MOVD in+24(FP), a_ptr
LDP 0*16(a_ptr), (acc0, acc1)
LDP 1*16(a_ptr), (acc2, acc3)
montReduceQW(acc0, acc1, acc2, acc3, t0, t1)
montReduceQW(acc1, acc2, acc3, acc0, t0, t1)
montReduceQW(acc2, acc3, acc0, acc1, t0, t1)
montReduceQW(acc3, acc0, acc1, acc2, t0, t1)
// sub p
MOVD c256const1<>(SB), const0
MOVD c256const3<>(SB), const1
MOVD $-1, minusOne
SUBS minusOne, acc0, t0
SBCS const0, acc1, t1
SBCS minusOne, acc2, t2
SBCS const1, acc3, t3
CSEL CS, t0, acc0, acc0
CSEL CS, t1, acc1, acc1
CSEL CS, t2, acc2, acc2
CSEL CS, t3, acc3, acc3
STP (acc0, acc1), 0*16(res_ptr)
STP (acc2, acc3), 1*16(res_ptr)
RET
#undef minusOne
/* ---------------------------------------*/
// Constant time point access to arbitrary point table.
// Indexed from 1 to 15, with -1 offset
// (index 0 is implicitly point at infinity)
// func c256Select(point, table []uint64, idx int)
TEXT ·c256Select(SB),NOSPLIT,$0
MOVD idx+48(FP), const0
MOVD table+24(FP), b_ptr
MOVD point+0(FP), res_ptr
EOR x0, x0, x0
EOR x1, x1, x1
EOR x2, x2, x2
EOR x3, x3, x3
EOR y0, y0, y0
EOR y1, y1, y1
EOR y2, y2, y2
EOR y3, y3, y3
EOR t0, t0, t0
EOR t1, t1, t1
EOR t2, t2, t2
EOR t3, t3, t3
MOVD $0, const1
loop_select:
ADD $1, const1
CMP const0, const1
LDP.P 16(b_ptr), (acc0, acc1)
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
LDP.P 16(b_ptr), (acc2, acc3)
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
LDP.P 16(b_ptr), (acc4, acc5)
CSEL EQ, acc4, y0, y0
CSEL EQ, acc5, y1, y1
LDP.P 16(b_ptr), (acc6, acc7)
CSEL EQ, acc6, y2, y2
CSEL EQ, acc7, y3, y3
LDP.P 16(b_ptr), (acc0, acc1)
CSEL EQ, acc0, t0, t0
CSEL EQ, acc1, t1, t1
LDP.P 16(b_ptr), (acc2, acc3)
CSEL EQ, acc2, t2, t2
CSEL EQ, acc3, t3, t3
CMP $16, const1
BNE loop_select
STP (x0, x1), 0*16(res_ptr)
STP (x2, x3), 1*16(res_ptr)
STP (y0, y1), 2*16(res_ptr)
STP (y2, y3), 3*16(res_ptr)
STP (t0, t1), 4*16(res_ptr)
STP (t2, t3), 5*16(res_ptr)
RET
/* ---------------------------------------*/
// Constant time point access to base point table.
// Note that the base point table is affine points
//
// func c256SelectBase(point, table []uint64, idx int)
TEXT ·c256SelectBase(SB),NOSPLIT,$0
MOVD idx+48(FP), t0
MOVD table+24(FP), t1
MOVD point+0(FP), res_ptr
EOR x0, x0, x0
EOR x1, x1, x1
EOR x2, x2, x2
EOR x3, x3, x3
EOR y0, y0, y0
EOR y1, y1, y1
EOR y2, y2, y2
EOR y3, y3, y3
MOVD $0, t2
loop_select:
ADD $1, t2
CMP t0, t2
LDP.P 16(t1), (acc0, acc1)
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
LDP.P 16(t1), (acc2, acc3)
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
LDP.P 16(t1), (acc4, acc5)
CSEL EQ, acc4, y0, y0
CSEL EQ, acc5, y1, y1
LDP.P 16(t1), (acc6, acc7)
CSEL EQ, acc6, y2, y2
CSEL EQ, acc7, y3, y3
CMP $32, t2
BNE loop_select
STP (x0, x1), 0*16(res_ptr)
STP (x2, x3), 1*16(res_ptr)
STP (y0, y1), 2*16(res_ptr)
STP (y2, y3), 3*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256OrdSqr(res, in []uint64, n int)
TEXT ·c256OrdSqr(SB),NOSPLIT,$0
MOVD in+24(FP), a_ptr
MOVD n+48(FP), b_ptr
MOVD c256ordK0<>(SB), hlp1
LDP c256ord<>+0x00(SB), (const0, const1)
LDP c256ord<>+0x10(SB), (const2, const3)
LDP 0*16(a_ptr), (x0, x1)
LDP 1*16(a_ptr), (x2, x3)
ordSqrLoop:
SUB $1, b_ptr
// x[1:] * x[0]
MUL x0, x1, acc1
UMULH x0, x1, acc2
MUL x0, x2, t0
ADDS t0, acc2, acc2
UMULH x0, x2, acc3
MUL x0, x3, t0
ADCS t0, acc3, acc3
UMULH x0, x3, acc4
ADC $0, acc4, acc4
// x[2:] * x[1]
MUL x1, x2, t0
ADDS t0, acc3
UMULH x1, x2, t1
ADCS t1, acc4
ADC $0, ZR, acc5
MUL x1, x3, t0
ADDS t0, acc4
UMULH x1, x3, t1
ADC t1, acc5
// x[3] * x[2]
MUL x2, x3, t0
ADDS t0, acc5
UMULH x2, x3, acc6
ADC $0, acc6
MOVD $0, acc7
// *2
ADDS acc1, acc1
ADCS acc2, acc2
ADCS acc3, acc3
ADCS acc4, acc4
ADCS acc5, acc5
ADCS acc6, acc6
ADC $0, acc7
// Missing products
MUL x0, x0, acc0
UMULH x0, x0, t0
ADDS t0, acc1, acc1
MUL x1, x1, t0
ADCS t0, acc2, acc2
UMULH x1, x1, t1
ADCS t1, acc3, acc3
MUL x2, x2, t0
ADCS t0, acc4, acc4
UMULH x2, x2, t1
ADCS t1, acc5, acc5
MUL x3, x3, t0
ADCS t0, acc6, acc6
UMULH x3, x3, t1
ADC t1, acc7, acc7
// Now the product is in acc[0:8]
// First reduction step - acc[0:8] + (k0*acc0 mod B) * Ord
MUL acc0, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc0, acc0
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc1, acc1
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc2, acc2
UMULH const2, hlp0, acc0
MUL const3, hlp0, t0
ADCS t0, acc3, acc3
UMULH const3, hlp0, hlp0
ADC $0, hlp0
ADDS t1, acc1, acc1
ADCS y0, acc2, acc2
ADCS acc0, acc3, acc3
ADC $0, hlp0, acc0
// Second reduction step
MUL acc1, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc1, acc1
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc2, acc2
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc3, acc3
UMULH const2, hlp0, acc1
MUL const3, hlp0, t0
ADCS t0, acc0, acc0
UMULH const3, hlp0, hlp0
ADC $0, hlp0
ADDS t1, acc2, acc2
ADCS y0, acc3, acc3
ADCS acc1, acc0, acc0
ADC $0, hlp0, acc1
// Third reduction step
MUL acc2, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc2, acc2
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc3, acc3
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc0, acc0
UMULH const2, hlp0, acc2
MUL const3, hlp0, t0
ADCS t0, acc1, acc1
UMULH const3, hlp0, hlp0
ADC $0, hlp0
ADDS t1, acc3, acc3
ADCS y0, acc0, acc0
ADCS acc2, acc1, acc1
ADC $0, hlp0, acc2
// Last reduction step
MUL acc3, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc3, acc3
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc0, acc0
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc1, acc1
UMULH const2, hlp0, acc3
MUL const3, hlp0, t0
ADCS t0, acc2, acc2
UMULH const3, hlp0, hlp0
ADC $0, acc7
ADDS t1, acc0, acc0
ADCS y0, acc1, acc1
ADCS acc3, acc2, acc2
ADC $0, hlp0, acc3
ADDS acc4, acc0, acc0
ADCS acc5, acc1, acc1
ADCS acc6, acc2, acc2
ADCS acc7, acc3, acc3
ADC $0, ZR, acc4
SUBS const0, acc0, y0
SBCS const1, acc1, y1
SBCS const2, acc2, y2
SBCS const3, acc3, y3
SBCS $0, acc4, acc4
CSEL CS, y0, acc0, x0
CSEL CS, y1, acc1, x1
CSEL CS, y2, acc2, x2
CSEL CS, y3, acc3, x3
CBNZ b_ptr, ordSqrLoop
MOVD res+0(FP), res_ptr
STP (x0, x1), 0*16(res_ptr)
STP (x2, x3), 1*16(res_ptr)
RET
/* ---------------------------------------*/
// func c256OrdMul(res, in1, in2 []uint64)
TEXT ·c256OrdMul(SB),NOSPLIT,$0
MOVD in1+24(FP), a_ptr
MOVD in2+48(FP), b_ptr
MOVD c256ordK0<>(SB), hlp1
LDP c256ord<>+0x00(SB), (const0, const1)
LDP c256ord<>+0x10(SB), (const2, const3)
LDP 0*16(a_ptr), (x0, x1)
LDP 1*16(a_ptr), (x2, x3)
LDP 0*16(b_ptr), (y0, y1)
LDP 1*16(b_ptr), (y2, y3)
// y[0] * x
MUL y0, x0, acc0
UMULH y0, x0, acc1
MUL y0, x1, t0
ADDS t0, acc1
UMULH y0, x1, acc2
MUL y0, x2, t0
ADCS t0, acc2
UMULH y0, x2, acc3
MUL y0, x3, t0
ADCS t0, acc3
UMULH y0, x3, acc4
ADC $0, acc4
// First reduction step
// [acc0, acc1, acc2, acc3, acc4] += (acc0 * k0 mod B) * N
// also rotate the acc0, acc1, acc2, acc3 => acc1, acc2, acc3, acc0
MUL acc0, hlp1, hlp0
// golib: hlp1? - should be a bug, but it matters?
// MUL const0, hlp1, t0
MUL const0, hlp0, t0
ADDS t0, acc0, acc0
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc1, acc1
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc2, acc2
UMULH const2, hlp0, acc0
MUL const3, hlp0, t0
ADCS t0, acc3, acc3
UMULH const3, hlp0, hlp0
ADC $0, acc4
ADDS t1, acc1, acc1
ADCS y0, acc2, acc2
ADCS acc0, acc3, acc3
ADC $0, hlp0, acc0
// y[1] * x
MUL y1, x0, t0
ADDS t0, acc1
UMULH y1, x0, t1
MUL y1, x1, t0
ADCS t0, acc2
UMULH y1, x1, hlp0
MUL y1, x2, t0
ADCS t0, acc3
UMULH y1, x2, y0
MUL y1, x3, t0
ADCS t0, acc4
UMULH y1, x3, y1
ADC $0, ZR, acc5
ADDS t1, acc2
ADCS hlp0, acc3
ADCS y0, acc4
ADC y1, acc5
// Second reduction step
MUL acc1, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc1, acc1
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc2, acc2
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc3, acc3
UMULH const2, hlp0, acc1
MUL const3, hlp0, t0
ADCS t0, acc0, acc0
UMULH const3, hlp0, hlp0
ADC $0, acc5
ADDS t1, acc2, acc2
ADCS y0, acc3, acc3
ADCS acc1, acc0, acc0
ADC $0, hlp0, acc1
// y[2] * x
MUL y2, x0, t0
ADDS t0, acc2
UMULH y2, x0, t1
MUL y2, x1, t0
ADCS t0, acc3
UMULH y2, x1, hlp0
MUL y2, x2, t0
ADCS t0, acc4
UMULH y2, x2, y0
MUL y2, x3, t0
ADCS t0, acc5
UMULH y2, x3, y1
ADC $0, ZR, acc6
ADDS t1, acc3
ADCS hlp0, acc4
ADCS y0, acc5
ADC y1, acc6
// Third reduction step
MUL acc2, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc2, acc2
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc3, acc3
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc0, acc0
UMULH const2, hlp0, acc2
MUL const3, hlp0, t0
ADCS t0, acc1, acc1
UMULH const3, hlp0, hlp0
ADC $0, acc6
ADDS t1, acc3, acc3
ADCS y0, acc0, acc0
ADCS acc2, acc1, acc1
ADC $0, hlp0, acc2
// y[3] * x
MUL y3, x0, t0
ADDS t0, acc3
UMULH y3, x0, t1
MUL y3, x1, t0
ADCS t0, acc4
UMULH y3, x1, hlp0
MUL y3, x2, t0
ADCS t0, acc5
UMULH y3, x2, y0
MUL y3, x3, t0
ADCS t0, acc6
UMULH y3, x3, y1
ADC $0, ZR, acc7
ADDS t1, acc4
ADCS hlp0, acc5
ADCS y0, acc6
ADC y1, acc7
// Last reduction step
MUL acc3, hlp1, hlp0
MUL const0, hlp1, t0
ADDS t0, acc3, acc3
UMULH const0, hlp0, t1
MUL const1, hlp0, t0
ADCS t0, acc0, acc0
UMULH const1, hlp0, y0
MUL const2, hlp0, t0
ADCS t0, acc1, acc1
UMULH const2, hlp0, acc3
MUL const3, hlp0, t0
ADCS t0, acc2, acc2
UMULH const3, hlp0, hlp0
ADC $0, acc7
ADDS t1, acc0, acc0
ADCS y0, acc1, acc1
ADCS acc3, acc2, acc2
ADC $0, hlp0, acc3
ADDS acc4, acc0, acc0
ADCS acc5, acc1, acc1
ADCS acc6, acc2, acc2
ADCS acc7, acc3, acc3
ADC $0, ZR, acc4
SUBS const0, acc0, t0
SBCS const1, acc1, t1
SBCS const2, acc2, t2
SBCS const3, acc3, t3
SBCS $0, acc4, acc4
CSEL CS, t0, acc0, acc0
CSEL CS, t1, acc1, acc1
CSEL CS, t2, acc2, acc2
CSEL CS, t3, acc3, acc3
MOVD res+0(FP), res_ptr
STP (acc0, acc1), 0*16(res_ptr)
STP (acc2, acc3), 1*16(res_ptr)
RET
/* ---------------------------------------*/
// x = y - x
TEXT c256SubInternal<>(SB),NOSPLIT,$0
SUBS x0, y0, acc0
SBCS x1, y1, acc1
SBCS x2, y2, acc2
SBCS x3, y3, acc3
SBC $0, ZR, t0
ADDS $-1, acc0, acc4
MOVD c256const1<>(SB), acc5
ADCS acc5, acc1, acc5
MOVD $-1, acc6
ADCS acc6, acc2, acc6
MOVD c256const3<>(SB), acc7
ADC acc7, acc3, acc7
ANDS $1, t0
CSEL EQ, acc0, acc4, x0
CSEL EQ, acc1, acc5, x1
CSEL EQ, acc2, acc6, x2
CSEL EQ, acc3, acc7, x3
RET
/* ---------------------------------------*/
// y[0:3] = x[0:3] ^ 2 / R mod p
TEXT c256SqrInternal<>(SB),NOSPLIT,$0
// x[1:] * x[0]
MUL x0, x1, acc1
UMULH x0, x1, acc2
MUL x0, x2, t0
ADDS t0, acc2, acc2
UMULH x0, x2, acc3
MUL x0, x3, t0
ADCS t0, acc3, acc3
UMULH x0, x3, acc4
ADC $0, acc4, acc4
// x[2:] * x[1]
MUL x1, x2, t0
ADDS t0, acc3
UMULH x1, x2, t1
ADCS t1, acc4
ADC $0, ZR, acc5
MUL x1, x3, t0
ADDS t0, acc4
UMULH x1, x3, t1
ADC t1, acc5
// x[3] * x[2]
MUL x2, x3, t0
ADDS t0, acc5
UMULH x2, x3, acc6
ADC $0, acc6
MOVD $0, acc7
// *2
ADDS acc1, acc1
ADCS acc2, acc2
ADCS acc3, acc3
ADCS acc4, acc4
ADCS acc5, acc5
ADCS acc6, acc6
ADC $0, acc7
// Missing products
MUL x0, x0, acc0
UMULH x0, x0, t0
ADDS t0, acc1, acc1
MUL x1, x1, t0
ADCS t0, acc2, acc2
UMULH x1, x1, t1
ADCS t1, acc3, acc3
MUL x2, x2, t0
ADCS t0, acc4, acc4
UMULH x2, x2, t1
ADCS t1, acc5, acc5
MUL x3, x3, t0
ADCS t0, acc6, acc6
UMULH x3, x3, t1
ADCS t1, acc7, acc7
// Reduction step
// Let r = 2^64, acc[0:3] / r mod p
montReduceQW(acc0, acc1, acc2, acc3, t0, t1)
montReduceQW(acc1, acc2, acc3, acc0, t0, t1)
montReduceQW(acc2, acc3, acc0, acc1, t0, t1)
montReduceQW(acc3, acc0, acc1, acc2, t0, t1)
// Add bits [511:256] of the sqr result
ADDS acc4, acc0, acc0
ADCS acc5, acc1, acc1
ADCS acc6, acc2, acc2
ADCS acc7, acc3, acc3
ADC $0, ZR, acc4
// sub p if necessary, p = [y2, y0, y2, y0]
MOVD c256const1<>(SB), y0
MOVD c256const3<>(SB), y1
MOVD $-1, y2
SUBS $-1, acc0, t0
SBCS y0, acc1, t1
SBCS y2, acc2, t2
SBCS y1, acc3, t3
SBCS $0, acc4, acc4
CSEL CS, t0, acc0, y0
CSEL CS, t1, acc1, y1
CSEL CS, t2, acc2, y2
CSEL CS, t3, acc3, y3
RET
/* ---------------------------------------*/
// y[0:3] = x[0:3] * y[0:3] / R
// 先计算acc[0:7] = x[0:3] * y[0:3]
// 再计算 acc[4:7] + (acc[0:3] + acc0*p)/R
// 注意：与amd64不同的是, amd64平台下寄存器不够，因此采用
// x*y = ((((y[0]*x)/r + y[1]*x)/r + y[2]*x)/r + y[3]*x)/r
// 只需要acc0~acc5, 少用两个寄存器
TEXT c256MulInternal<>(SB),NOSPLIT,$0
// acc[0:4] = y[0] * x
MUL y0, x0, acc0
UMULH y0, x0, acc1
MUL y0, x1, t0
ADDS t0, acc1
UMULH y0, x1, acc2
MUL y0, x2, t0
ADCS t0, acc2
UMULH y0, x2, acc3
MUL y0, x3, t0
ADCS t0, acc3
UMULH y0, x3, acc4
ADC $0, acc4
// y[1] * x
MUL y1, x0, t0
ADDS t0, acc1
UMULH y1, x0, t1
MUL y1, x1, t0
ADCS t0, acc2
UMULH y1, x1, t2
MUL y1, x2, t0
ADCS t0, acc3
UMULH y1, x2, t3
MUL y1, x3, t0
ADCS t0, acc4
UMULH y1, x3, hlp0
ADC $0, ZR, acc5
ADDS t1, acc2
ADCS t2, acc3
ADCS t3, acc4
ADC hlp0, acc5
// y[2] * x
MUL y2, x0, t0
ADDS t0, acc2
UMULH y2, x0, t1
MUL y2, x1, t0
ADCS t0, acc3
UMULH y2, x1, t2
MUL y2, x2, t0
ADCS t0, acc4
UMULH y2, x2, t3
MUL y2, x3, t0
ADCS t0, acc5
UMULH y2, x3, hlp0
ADC $0, ZR, acc6
ADDS t1, acc3
ADCS t2, acc4
ADCS t3, acc5
ADC hlp0, acc6
// Third reduction step
// montReduceQW(acc2, acc3, acc0, acc1, t0, t1)
// y[3] * x
MUL y3, x0, t0
ADDS t0, acc3
UMULH y3, x0, t1
MUL y3, x1, t0
ADCS t0, acc4
UMULH y3, x1, t2
MUL y3, x2, t0
ADCS t0, acc5
UMULH y3, x2, t3
MUL y3, x3, t0
ADCS t0, acc6
UMULH y3, x3, hlp0
ADC $0, ZR, acc7
ADDS t1, acc4
ADCS t2, acc5
ADCS t3, acc6
ADC hlp0, acc7
// Reduction step
montReduceQW(acc0, acc1, acc2, acc3, t0, t1)
montReduceQW(acc1, acc2, acc3, acc0, t0, t1)
montReduceQW(acc2, acc3, acc0, acc1, t0, t1)
montReduceQW(acc3, acc0, acc1, acc2, t0, t1)
// Add bits [511:256] of the mul result
ADDS acc4, acc0, acc0
ADCS acc5, acc1, acc1
ADCS acc6, acc2, acc2
ADCS acc7, acc3, acc3
ADC $0, ZR, acc4
MOVD c256const1<>(SB), y0
MOVD c256const3<>(SB), y1
MOVD $-1, y2
SUBS $-1, acc0, t0
SBCS y0, acc1, t1
SBCS y2, acc2, t2
SBCS y1, acc3, t3
SBCS $0, acc4, acc4
CSEL CS, t0, acc0, y0
CSEL CS, t1, acc1, y1
CSEL CS, t2, acc2, y2
CSEL CS, t3, acc3, y3
RET
/* ---------------------------------------*/
// x[0:3] = 2*y[0:3] mod p
#define c256MulBy2Inline \
ADDS y0, y0, x0; \
ADCS y1, y1, x1; \
ADCS y2, y2, x2; \
ADCS y3, y3, x3; \
ADC $0, ZR, hlp0; \
\
SUBS $-1, x0, t0; \
MOVD c256const1<>(SB), t1; \
SBCS t1, x1, t1; \
MOVD $-1, t2; \
SBCS t2, x2, t2; \
MOVD c256const3<>(SB), t3; \
SBCS t3, x3, t3; \
SBCS $0, hlp0, hlp0; \
\
CSEL CC, x0, t0, x0; \
CSEL CC, x1, t1, x1; \
CSEL CC, x2, t2, x2; \
CSEL CC, x3, t3, x3;
/* ---------------------------------------*/
#define x1in(off) (off)(a_ptr)
#define y1in(off) (off + 32)(a_ptr)
#define z1in(off) (off + 64)(a_ptr)
#define x2in(off) (off)(b_ptr)
#define z2in(off) (off + 64)(b_ptr)
#define x3out(off) (off)(res_ptr)
#define y3out(off) (off + 32)(res_ptr)
#define z3out(off) (off + 64)(res_ptr)
#define LDx(src) LDP src(0), (x0, x1); LDP src(16), (x2, x3)
#define LDy(src) LDP src(0), (y0, y1); LDP src(16), (y2, y3)
#define STx(src) STP (x0, x1), src(0); STP (x2, x3), src(16)
#define STy(src) STP (y0, y1), src(0); STP (y2, y3), src(16)
/* ---------------------------------------*/
#define y2in(off) (32*0 + 8 + off)(RSP)
#define s2(off) (32*1 + 8 + off)(RSP)
#define z1sqr(off) (32*2 + 8 + off)(RSP)
#define h(off) (32*3 + 8 + off)(RSP)
#define r(off) (32*4 + 8 + off)(RSP)
#define hsqr(off) (32*5 + 8 + off)(RSP)
#define rsqr(off) (32*6 + 8 + off)(RSP)
#define hcub(off) (32*7 + 8 + off)(RSP)
#define z2sqr(off) (32*8 + 8 + off)(RSP)
#define s1(off) (32*9 + 8 + off)(RSP)
#define u1(off) (32*10 + 8 + off)(RSP)
#define u2(off) (32*11 + 8 + off)(RSP)
// func c256PointAddAffineAsm(res, in1, in2 []uint64, sign, sel, zero int)
// local var y2in ~ hcub, 32*8 + 8 = 264
// Fix issue 7: if NOSPLIT is not specified for the TEXT, the argument size must be provided
TEXT ·c256PointAddAffineAsm(SB),0,$264-96
MOVD in1+24(FP), a_ptr
MOVD in2+48(FP), b_ptr
MOVD sign+72(FP), hlp0
MOVD sel+80(FP), hlp1
MOVD zero+88(FP), t2
MOVD $1, t0
CMP $0, t2
CSEL EQ, ZR, t0, t2
CMP $0, hlp1
CSEL EQ, ZR, t0, hlp1
MOVD c256const1<>(SB), const0
MOVD c256const3<>(SB), const1
EOR t2<<1, hlp1
// Negate y2in based on sign
LDP 2*16(b_ptr), (y0, y1)
LDP 3*16(b_ptr), (y2, y3)
MOVD $-1, t0
// acc0-acc3,t0 = p-y
SUBS y0, t0, acc0
SBCS y1, const0, acc1
SBCS y2, t0, acc2
SBCS y3, const1, acc3
SBC $0, ZR, t0
// acc4-acc7,t0 = p-y + p = 2p - y
ADDS $-1, acc0, acc4
ADCS const0, acc1, acc5
MOVD $-1, acc6
ADCS acc6, acc2, acc6
ADCS const1, acc3, acc7
ADC $0, t0, t0
CMP $0, t0
CSEL EQ, acc4, acc0, acc0
CSEL EQ, acc5, acc1, acc1
CSEL EQ, acc6, acc2, acc2
CSEL EQ, acc7, acc3, acc3
// If condition is 0, keep original value
CMP $0, hlp0
CSEL EQ, y0, acc0, y0
CSEL EQ, y1, acc1, y1
CSEL EQ, y2, acc2, y2
CSEL EQ, y3, acc3, y3
// Store result
STy(y2in)
// Begin point add
LDx(z1in)
CALL c256SqrInternal<>(SB) // z1ˆ2
STy(z1sqr)
LDx(x2in)
CALL c256MulInternal<>(SB) // x2 * z1ˆ2
LDx(x1in)
CALL c256SubInternal<>(SB) // h = u2 - u1
STx(h)
LDy(z1in)
CALL c256MulInternal<>(SB) // z3 = h * z1
LDP 4*16(a_ptr), (acc0, acc1)// iff select[0] == 0, z3 = z1
LDP 5*16(a_ptr), (acc2, acc3)
ANDS $1, hlp1, ZR
CSEL EQ, acc0, y0, y0
CSEL EQ, acc1, y1, y1
CSEL EQ, acc2, y2, y2
CSEL EQ, acc3, y3, y3
LDP c256one<>+0x00(SB), (acc0, acc1)
LDP c256one<>+0x10(SB), (acc2, acc3)
ANDS $2, hlp1, ZR // iff select[1] == 0, z3 = 1
CSEL EQ, acc0, y0, y0
CSEL EQ, acc1, y1, y1
CSEL EQ, acc2, y2, y2
CSEL EQ, acc3, y3, y3
LDx(z1in) // must load first in case z3out = z1in.
MOVD res+0(FP), t0
STP (y0, y1), 4*16(t0)
STP (y2, y3), 5*16(t0)
LDy(z1sqr)
CALL c256MulInternal<>(SB) // z1 ^ 3
LDx(y2in)
CALL c256MulInternal<>(SB) // s2 = y2 * z1ˆ3
STy(s2)
LDx(y1in)
CALL c256SubInternal<>(SB) // r = s2 - s1
STx(r)
CALL c256SqrInternal<>(SB) // rsqr = rˆ2
STy (rsqr)
LDx(h)
CALL c256SqrInternal<>(SB) // hsqr = hˆ2
STy(hsqr)
CALL c256MulInternal<>(SB) // hcub = hˆ3
STy(hcub)
LDx(y1in)
CALL c256MulInternal<>(SB) // y1 * hˆ3
STy(s2)
LDP hsqr(0*8), (x0, x1)
LDP hsqr(2*8), (x2, x3)
LDP 0*16(a_ptr), (y0, y1)
LDP 1*16(a_ptr), (y2, y3)
CALL c256MulInternal<>(SB) // u1 * hˆ2
STP (y0, y1), h(0*8)
STP (y2, y3), h(2*8)
c256MulBy2Inline // u1 * hˆ2 * 2, inline
LDy(rsqr)
CALL c256SubInternal<>(SB) // rˆ2 - u1 * hˆ2 * 2
MOVD x0, y0
MOVD x1, y1
MOVD x2, y2
MOVD x3, y3
LDx(hcub)
CALL c256SubInternal<>(SB)
LDP 0*16(a_ptr), (acc0, acc1)
LDP 1*16(a_ptr), (acc2, acc3)
ANDS $1, hlp1, ZR // iff select[0] == 0, x3 = x1
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
LDP 0*16(b_ptr), (acc0, acc1)
LDP 1*16(b_ptr), (acc2, acc3)
ANDS $2, hlp1, ZR // iff select[1] == 0, x3 = x2
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
MOVD res+0(FP), t0
STP (x0, x1), 0*16(t0)
STP (x2, x3), 1*16(t0)
LDP h(0*8), (y0, y1)
LDP h(2*8), (y2, y3)
CALL c256SubInternal<>(SB)
LDP r(0*8), (y0, y1)
LDP r(2*8), (y2, y3)
CALL c256MulInternal<>(SB)
LDP s2(0*8), (x0, x1)
LDP s2(2*8), (x2, x3)
CALL c256SubInternal<>(SB)
LDP 2*16(a_ptr), (acc0, acc1)
LDP 3*16(a_ptr), (acc2, acc3)
ANDS $1, hlp1, ZR // iff select[0] == 0, y3 = y1
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
LDP y2in(0*8), (acc0, acc1)
LDP y2in(2*8), (acc2, acc3)
ANDS $2, hlp1, ZR // iff select[1] == 0, y3 = y2
CSEL EQ, acc0, x0, x0
CSEL EQ, acc1, x1, x1
CSEL EQ, acc2, x2, x2
CSEL EQ, acc3, x3, x3
MOVD res+0(FP), t0
STP (x0, x1), 2*16(t0)
STP (x2, x3), 3*16(t0)
RET
// x[0:3] = x[0:3]+y[0:3]
#define c256AddInline \
ADDS y0, x0, x0; \
ADCS y1, x1, x1; \
ADCS y2, x2, x2; \
ADCS y3, x3, x3; \
ADC $0, ZR, hlp0; \
\
SUBS $-1, x0, t0; \
MOVD c256const1<>(SB), t1; \
SBCS t1, x1, t1; \
MOVD $-1, t2; \
SBCS t2, x2, t2; \
MOVD c256const3<>(SB), t3; \
SBCS t3, x3, t3; \
SBCS $0, hlp0, hlp0; \
\
CSEL CC, x0, t0, x0; \
CSEL CC, x1, t1, x1; \
CSEL CC, x2, t2, x2; \
CSEL CC, x3, t3, x3;
// TEXT ·c256Add(SB),NOSPLIT,$0
// MOVD res+0(FP), res_ptr
// MOVD in1+24(FP), a_ptr
// MOVD in2+48(FP), b_ptr
// LDP 0*16(a_ptr), (x0, x1)
// LDP 1*16(a_ptr), (x2, x3)
// LDP 0*16(b_ptr), (y0, y1)
// LDP 1*16(b_ptr), (y2, y3)
// c256AddInline
// STP (x0, x1), 0*16(res_ptr)
// STP (x2, x3), 1*16(res_ptr)
// RET
#define s(off) (32*0 + 8 + off)(RSP)
#define m(off) (32*1 + 8 + off)(RSP)
#define zsqr(off) (32*2 + 8 + off)(RSP)
#define tmp(off) (32*3 + 8 + off)(RSP)
// func c256PointDoubleAsm(res, in []uint64)
// the "dbl-1986-cc-2" from https://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html
// S = 4*X1*Y1^2
// M = 3*(X1-Z1^2)*(X1+Z1^2)
// T = M^2-2*S
// X3 = T
// Y3 = M*(S-T)-8*Y1^4
// Z3 = 2*Y1*Z1
// local var 32*4 + 8 = 136
TEXT ·c256PointDoubleAsm(SB),NOSPLIT,$136-48
MOVD res+0(FP), res_ptr
MOVD in+24(FP), a_ptr
// Begin point double
LDP 4*16(a_ptr), (x0, x1)
LDP 5*16(a_ptr), (x2, x3)
CALL c256SqrInternal<>(SB)
STP (y0, y1), zsqr(0*8)
STP (y2, y3), zsqr(2*8) // zsqr = z1^2
LDP 0*16(a_ptr), (x0, x1)
LDP 1*16(a_ptr), (x2, x3)
c256AddInline
STx(m) // m = x1 + z1^2
LDx(z1in)
LDy(y1in)
CALL c256MulInternal<>(SB)
c256MulBy2Inline
STx(z3out) // z3 = 2*z1*y1
LDy(x1in)
LDx(zsqr)
CALL c256SubInternal<>(SB)
LDy(m)
CALL c256MulInternal<>(SB)// (x1 + z1^2)*(x1 - z^2)
// Multiply by 3
c256MulBy2Inline
c256AddInline
STx(m) // m=3(x1 + z1^2)*(x1 - z^2)
LDy(y1in)
c256MulBy2Inline
CALL c256SqrInternal<>(SB)
STy(s) // s = 4y1^2
MOVD y0, x0
MOVD y1, x1
MOVD y2, x2
MOVD y3, x3
CALL c256SqrInternal<>(SB) // 16*y1^2
// Divide by 2
ADDS $-1, y0, t0
MOVD c256const1<>(SB), t1
ADCS t1, y1, t1
MOVD $-1, t2
ADCS t2, y2, t2
MOVD c256const3<>(SB), t3
ADCS t3, y3, t3
ADC $0, ZR, hlp0
ANDS $1, y0, ZR
CSEL EQ, y0, t0, t0
CSEL EQ, y1, t1, t1
CSEL EQ, y2, t2, t2
CSEL EQ, y3, t3, t3
AND y0, hlp0, hlp0
EXTR $1, t0, t1, y0
EXTR $1, t1, t2, y1
EXTR $1, t2, t3, y2
EXTR $1, t3, hlp0, y3
STy(y3out) // y3 = 8y1^2
LDx(x1in)
LDy(s)
CALL c256MulInternal<>(SB)
STy(s)// s = 4*x1*y1^2
c256MulBy2Inline
STx(tmp) // tmp = 2*s
LDx(m)
CALL c256SqrInternal<>(SB)
LDx(tmp)
CALL c256SubInternal<>(SB)
STx(x3out) // x3 = m^2 - 2s
LDy(s)
CALL c256SubInternal<>(SB) // s-x3
LDy(m)
CALL c256MulInternal<>(SB) // m(s-x3)
LDx(y3out)
CALL c256SubInternal<>(SB)
STx(y3out)// y3 = m(s-x3) - 8y1^2
RET
/* ---------------------------------------*/
#undef y2in
#undef x3out
#undef y3out
#undef z3out
#define y2in(off) (off + 32)(b_ptr)
#define x3out(off) (off)(b_ptr)
#define y3out(off) (off + 32)(b_ptr)
#define z3out(off) (off + 64)(b_ptr)
//func c256PointAddAsm(res, in1, in2 []uint64) int
// local var: 32*12 + 8 = 392
TEXT ·c256PointAddAsm(SB),0,$392-80
// See https://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-3.html#addition-add-2007-bl
// Move input to stack in order to free registers
MOVD in1+24(FP), a_ptr
MOVD in2+48(FP), b_ptr
// Begin point add
LDx(z2in)
CALL c256SqrInternal<>(SB) // z2^2
STy(z2sqr)
CALL c256MulInternal<>(SB) // z2^3
LDx(y1in)
CALL c256MulInternal<>(SB) // s1 = z2ˆ3*y1
STy(s1)
LDx(z1in)
CALL c256SqrInternal<>(SB) // z1^2
STy(z1sqr)
CALL c256MulInternal<>(SB) // z1^3
LDx(y2in)
CALL c256MulInternal<>(SB) // s2 = z1ˆ3*y2
LDx(s1)
CALL c256SubInternal<>(SB) // r = s2 - s1
STx(r)
MOVD $1, t2
ORR x0, x1, t0 // Check if zero mod c256 --- TODO
ORR x2, x3, t1
ORR t1, t0, t0
CMP $0, t0
CSEL EQ, t2, ZR, hlp1
EOR $-1, x0, t0
MOVD c256const1<>(SB), t1
EOR t1, x1, t1
EOR $-1, x2, t2
MOVD c256const3<>(SB), t3
EOR t3, x3, t3
ORR t0, t1, t0
ORR t2, t3, t1
ORR t1, t0, t0
CMP $0, t0
CSEL EQ, t2, hlp1, hlp1
LDx(z2sqr)
LDy(x1in)
CALL c256MulInternal<>(SB) // u1 = x1 * z2ˆ2
STy(u1)
LDx(z1sqr)
LDy(x2in)
CALL c256MulInternal<>(SB) // u2 = x2 * z1ˆ2
STy(u2)
LDx(u1)
CALL c256SubInternal<>(SB) // h = u2 - u1
STx(h)
MOVD $1, t2
ORR x0, x1, t0 // Check if zero mod c256
ORR x2, x3, t1
ORR t1, t0, t0
CMP $0, t0
CSEL EQ, t2, ZR, hlp0
EOR $-1, x0, t0
MOVD c256const1<>(SB), t1
EOR t1, x1, t1
EOR $-1, x2, t2
MOVD c256const3<>(SB), t3
EOR t3, x3, t3
ORR t0, t1, t0
ORR t2, t3, t1
ORR t1, t0, t0
CMP $0, t0
CSEL EQ, t2, hlp0, hlp0
AND hlp0, hlp1, hlp1
LDx(r)
CALL c256SqrInternal<>(SB) // rsqr = rˆ2
STy(rsqr)
LDx(h)
CALL c256SqrInternal<>(SB) // hsqr = hˆ2
STy(hsqr)
LDx(h)
CALL c256MulInternal<>(SB) // hcub = hˆ3
STy(hcub)
LDx(s1)
CALL c256MulInternal<>(SB)
STy(s2)
LDx(z1in)
LDy(z2in)
CALL c256MulInternal<>(SB) // z1 * z2
LDx(h)
CALL c256MulInternal<>(SB) // z1 * z2 * h
MOVD res+0(FP), b_ptr
STy(z3out)
LDx(hsqr)
LDy(u1)
CALL c256MulInternal<>(SB) // hˆ2 * u1
STy(u2)
c256MulBy2Inline // u1 * hˆ2 * 2, inline
LDy(rsqr)
CALL c256SubInternal<>(SB) // rˆ2 - u1 * hˆ2 * 2
MOVD x0, y0
MOVD x1, y1
MOVD x2, y2
MOVD x3, y3
LDx(hcub)
CALL c256SubInternal<>(SB)
STx(x3out)
LDy(u2)
CALL c256SubInternal<>(SB)
LDy(r)
CALL c256MulInternal<>(SB)
LDx(s2)
CALL c256SubInternal<>(SB)
STx(y3out)
MOVD hlp1, R0
MOVD R0, ret+72(FP)
RET
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