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122 lines
3.5 KiB
ArmAsm
122 lines
3.5 KiB
ArmAsm
// Copyright ©2016 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
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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_C X1
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#define ALPHA2 X10
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#define ALPHA_C2 X11
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#define MOVDDUP_X2_X3 LONG $0xDA120FF2 // MOVDDUP X2, X3
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#define MOVDDUP_X4_X5 LONG $0xEC120FF2 // MOVDDUP X4, X5
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#define MOVDDUP_X6_X7 LONG $0xFE120FF2 // MOVDDUP X6, X7
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#define MOVDDUP_X8_X9 LONG $0x120F45F2; BYTE $0xC8 // MOVDDUP X8, X9
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#define ADDSUBPD_X2_X3 LONG $0xDAD00F66 // ADDSUBPD X2, X3
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#define ADDSUBPD_X4_X5 LONG $0xECD00F66 // ADDSUBPD X4, X5
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#define ADDSUBPD_X6_X7 LONG $0xFED00F66 // ADDSUBPD X6, X7
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#define ADDSUBPD_X8_X9 LONG $0xD00F4566; BYTE $0xC8 // ADDSUBPD X8, X9
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// func ScalInc(alpha complex128, x []complex128, n, inc uintptr)
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TEXT ·ScalInc(SB), NOSPLIT, $0
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MOVQ x_base+16(FP), SRC // SRC = &x
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MOVQ n+40(FP), LEN // LEN = len(x)
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CMPQ LEN, $0
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JE scal_end // if LEN == 0 { return }
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MOVQ inc+48(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+0(FP), ALPHA // ALPHA = { imag(alpha), real(alpha) }
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MOVAPS ALPHA, ALPHA_C
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SHUFPD $0x1, ALPHA_C, ALPHA_C // ALPHA_C = { real(alpha), imag(alpha) }
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MOVAPS ALPHA, ALPHA2 // Copy ALPHA and ALPHA_C for pipelining
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MOVAPS ALPHA_C, ALPHA_C2
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MOVQ LEN, TAIL
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SHRQ $2, LEN // LEN = floor( n / 4 )
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JZ scal_tail // if BX == 0 { goto scal_tail }
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scal_loop: // do {
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MOVUPS (SRC), X2 // X_i = { imag(x[i]), real(x[i]) }
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MOVUPS (SRC)(INC*1), X4
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MOVUPS (SRC)(INC*2), X6
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MOVUPS (SRC)(INC3*1), X8
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// X_(i+1) = { real(x[i], real(x[i]) }
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MOVDDUP_X2_X3
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MOVDDUP_X4_X5
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MOVDDUP_X6_X7
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MOVDDUP_X8_X9
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// X_i = { imag(x[i]), imag(x[i]) }
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SHUFPD $0x3, X2, X2
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SHUFPD $0x3, X4, X4
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SHUFPD $0x3, X6, X6
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SHUFPD $0x3, X8, X8
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// X_i = { real(ALPHA) * imag(x[i]), imag(ALPHA) * imag(x[i]) }
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// X_(i+1) = { imag(ALPHA) * real(x[i]), real(ALPHA) * real(x[i]) }
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MULPD ALPHA_C, X2
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MULPD ALPHA, X3
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MULPD ALPHA_C2, X4
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MULPD ALPHA2, X5
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MULPD ALPHA_C, X6
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MULPD ALPHA, X7
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MULPD ALPHA_C2, X8
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MULPD ALPHA2, X9
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// X_(i+1) = {
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// imag(result[i]): imag(ALPHA)*real(x[i]) + real(ALPHA)*imag(x[i]),
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// real(result[i]): real(ALPHA)*real(x[i]) - imag(ALPHA)*imag(x[i])
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// }
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ADDSUBPD_X2_X3
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ADDSUBPD_X4_X5
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ADDSUBPD_X6_X7
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ADDSUBPD_X8_X9
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MOVUPS X3, (DST) // x[i] = X_(i+1)
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MOVUPS X5, (DST)(INC*1)
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MOVUPS X7, (DST)(INC*2)
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MOVUPS X9, (DST)(INC3*1)
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LEAQ (SRC)(INC*4), SRC // SRC = &(SRC[inc*4])
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DECQ LEN
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JNZ scal_loop // } while --BX > 0
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scal_tail:
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ANDQ $3, TAIL // TAIL = TAIL % 4
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JE scal_end // if TAIL == 0 { return }
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scal_tail_loop: // do {
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MOVUPS (SRC), X2 // X_i = { imag(x[i]), real(x[i]) }
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MOVDDUP_X2_X3 // X_(i+1) = { real(x[i], real(x[i]) }
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SHUFPD $0x3, X2, X2 // X_i = { imag(x[i]), imag(x[i]) }
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MULPD ALPHA_C, X2 // X_i = { real(ALPHA) * imag(x[i]), imag(ALPHA) * imag(x[i]) }
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MULPD ALPHA, X3 // X_(i+1) = { imag(ALPHA) * real(x[i]), real(ALPHA) * real(x[i]) }
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// X_(i+1) = {
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// imag(result[i]): imag(ALPHA)*real(x[i]) + real(ALPHA)*imag(x[i]),
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// real(result[i]): real(ALPHA)*real(x[i]) - imag(ALPHA)*imag(x[i])
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// }
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ADDSUBPD_X2_X3
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MOVUPS X3, (DST) // x[i] = X_i
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ADDQ INC, SRC // SRC = &(SRC[incX])
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DECQ TAIL
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JNZ scal_tail_loop // } while --TAIL > 0
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scal_end:
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RET
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