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// Copyright ©2017 The Gonum 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 !noasm,!gccgo,!safe
#include "textflag.h"
#define SRC SI
#define DST SI
#define LEN CX
#define IDX AX
#define TAIL BX
#define ALPHA X0
#define ALPHA_2 X1
#define MOVDDUP_ALPHA LONG $0x44120FF2; WORD $0x0824 // MOVDDUP 8(SP), X0
// func DscalUnitary(alpha float64, x []complex128)
TEXT ·DscalUnitary(SB), NOSPLIT, $0
MOVQ x_base+8(FP), SRC // SRC = &x
MOVQ x_len+16(FP), LEN // LEN = len(x)
CMPQ LEN, $0 // if LEN == 0 { return }
JE dscal_end
MOVDDUP_ALPHA // ALPHA = alpha
XORQ IDX, IDX // IDX = 0
MOVUPS ALPHA, ALPHA_2 // Copy ALPHA to ALPHA_2 for pipelining
MOVQ LEN, TAIL // TAIL = LEN
SHRQ $2, LEN // LEN = floor( n / 4 )
JZ dscal_tail // if LEN == 0 { goto dscal_tail }
dscal_loop: // do {
MOVUPS (SRC)(IDX*8), X2 // X_i = x[i]
MOVUPS 16(SRC)(IDX*8), X3
MOVUPS 32(SRC)(IDX*8), X4
MOVUPS 48(SRC)(IDX*8), X5
MULPD ALPHA, X2 // X_i *= ALPHA
MULPD ALPHA_2, X3
MULPD ALPHA, X4
MULPD ALPHA_2, X5
MOVUPS X2, (DST)(IDX*8) // x[i] = X_i
MOVUPS X3, 16(DST)(IDX*8)
MOVUPS X4, 32(DST)(IDX*8)
MOVUPS X5, 48(DST)(IDX*8)
ADDQ $8, IDX // IDX += 8
DECQ LEN
JNZ dscal_loop // } while --LEN > 0
dscal_tail:
ANDQ $3, TAIL // TAIL = TAIL % 4
JZ dscal_end // if TAIL == 0 { return }
dscal_tail_loop: // do {
MOVUPS (SRC)(IDX*8), X2 // X_i = x[i]
MULPD ALPHA, X2 // X_i *= ALPHA
MOVUPS X2, (DST)(IDX*8) // x[i] = X_i
ADDQ $2, IDX // IDX += 2
DECQ TAIL
JNZ dscal_tail_loop // } while --TAIL > 0
dscal_end:
RET
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