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70 lines
1.8 KiB
ArmAsm
70 lines
1.8 KiB
ArmAsm
// Copyright ©2017 The Gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !noasm,!appengine,!safe
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#include "textflag.h"
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#define SRC SI
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#define DST SI
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#define LEN CX
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#define TAIL BX
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#define INC R9
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#define INC3 R10
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#define ALPHA X0
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#define ALPHA_2 X1
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#define MOVDDUP_ALPHA LONG $0x44120FF2; WORD $0x0824 // MOVDDUP 8(SP), X0
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// func DscalInc(alpha float64, x []complex128, n, inc uintptr)
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TEXT ·DscalInc(SB), NOSPLIT, $0
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MOVQ x_base+8(FP), SRC // SRC = &x
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MOVQ n+32(FP), LEN // LEN = n
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CMPQ LEN, $0 // if LEN == 0 { return }
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JE dscal_end
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MOVDDUP_ALPHA // ALPHA = alpha
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MOVQ inc+40(FP), INC // INC = inc
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SHLQ $4, INC // INC = INC * sizeof(complex128)
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LEAQ (INC)(INC*2), INC3 // INC3 = 3 * INC
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MOVUPS ALPHA, ALPHA_2 // Copy ALPHA and ALPHA_2 for pipelining
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MOVQ LEN, TAIL // TAIL = LEN
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SHRQ $2, LEN // LEN = floor( n / 4 )
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JZ dscal_tail // if LEN == 0 { goto dscal_tail }
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dscal_loop: // do {
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MOVUPS (SRC), X2 // X_i = x[i]
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MOVUPS (SRC)(INC*1), X3
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MOVUPS (SRC)(INC*2), X4
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MOVUPS (SRC)(INC3*1), X5
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MULPD ALPHA, X2 // X_i *= ALPHA
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MULPD ALPHA_2, X3
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MULPD ALPHA, X4
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MULPD ALPHA_2, X5
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MOVUPS X2, (DST) // x[i] = X_i
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MOVUPS X3, (DST)(INC*1)
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MOVUPS X4, (DST)(INC*2)
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MOVUPS X5, (DST)(INC3*1)
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LEAQ (SRC)(INC*4), SRC // SRC += INC*4
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DECQ LEN
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JNZ dscal_loop // } while --LEN > 0
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dscal_tail:
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ANDQ $3, TAIL // TAIL = TAIL % 4
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JE dscal_end // if TAIL == 0 { return }
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dscal_tail_loop: // do {
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MOVUPS (SRC), X2 // X_i = x[i]
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MULPD ALPHA, X2 // X_i *= ALPHA
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MOVUPS X2, (DST) // x[i] = X_i
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ADDQ INC, SRC // SRC += INC
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DECQ TAIL
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JNZ dscal_tail_loop // } while --TAIL > 0
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dscal_end:
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RET
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