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124 lines
3.9 KiB
ArmAsm
124 lines
3.9 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,!safe
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#include "textflag.h"
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// MOVDDUP X2, X3
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#define MOVDDUP_X2_X3 BYTE $0xF2; BYTE $0x0F; BYTE $0x12; BYTE $0xDA
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// MOVDDUP X4, X5
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#define MOVDDUP_X4_X5 BYTE $0xF2; BYTE $0x0F; BYTE $0x12; BYTE $0xEC
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// MOVDDUP X6, X7
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#define MOVDDUP_X6_X7 BYTE $0xF2; BYTE $0x0F; BYTE $0x12; BYTE $0xFE
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// MOVDDUP X8, X9
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#define MOVDDUP_X8_X9 BYTE $0xF2; BYTE $0x45; BYTE $0x0F; BYTE $0x12; BYTE $0xC8
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// ADDSUBPD X2, X3
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#define ADDSUBPD_X2_X3 BYTE $0x66; BYTE $0x0F; BYTE $0xD0; BYTE $0xDA
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// ADDSUBPD X4, X5
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#define ADDSUBPD_X4_X5 BYTE $0x66; BYTE $0x0F; BYTE $0xD0; BYTE $0xEC
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// ADDSUBPD X6, X7
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#define ADDSUBPD_X6_X7 BYTE $0x66; BYTE $0x0F; BYTE $0xD0; BYTE $0xFE
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// ADDSUBPD X8, X9
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#define ADDSUBPD_X8_X9 BYTE $0x66; BYTE $0x45; BYTE $0x0F; BYTE $0xD0; BYTE $0xC8
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// func AxpyUnitaryTo(dst []complex128, alpha complex64, x, y []complex128)
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TEXT ·AxpyUnitaryTo(SB), NOSPLIT, $0
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MOVQ dst_base+0(FP), DI // DI = &dst
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MOVQ x_base+40(FP), SI // SI = &x
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MOVQ y_base+64(FP), DX // DX = &y
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MOVQ x_len+48(FP), CX // CX = min( len(x), len(y), len(dst) )
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CMPQ y_len+72(FP), CX
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CMOVQLE y_len+72(FP), CX
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CMPQ dst_len+8(FP), CX
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CMOVQLE dst_len+8(FP), CX
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CMPQ CX, $0 // if CX == 0 { return }
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JE caxy_end
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MOVUPS alpha+24(FP), X0 // X0 = { imag(a), real(a) }
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MOVAPS X0, X1
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SHUFPD $0x1, X1, X1 // X1 = { real(a), imag(a) }
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XORQ AX, AX // i = 0
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MOVAPS X0, X10 // Copy X0 and X1 for pipelining
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MOVAPS X1, X11
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MOVQ CX, BX
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ANDQ $3, CX // CX = n % 4
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SHRQ $2, BX // BX = floor( n / 4 )
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JZ caxy_tail // if BX == 0 { goto caxy_tail }
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caxy_loop: // do {
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MOVUPS (SI)(AX*8), X2 // X_i = { imag(x[i]), real(x[i]) }
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MOVUPS 16(SI)(AX*8), X4
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MOVUPS 32(SI)(AX*8), X6
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MOVUPS 48(SI)(AX*8), X8
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// X_(i+1) = { real(x[i], real(x[i]) }
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MOVDDUP_X2_X3 // Load and duplicate imag elements (xi, xi)
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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 // duplicate real elements (xr, xr)
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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(a) * imag(x[i]), imag(a) * imag(x[i]) }
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// X_(i+1) = { imag(a) * real(x[i]), real(a) * real(x[i]) }
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MULPD X1, X2
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MULPD X0, X3
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MULPD X11, X4
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MULPD X10, X5
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MULPD X1, X6
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MULPD X0, X7
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MULPD X11, X8
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MULPD X10, X9
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// X_(i+1) = {
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// imag(result[i]): imag(a)*real(x[i]) + real(a)*imag(x[i]),
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// real(result[i]): real(a)*real(x[i]) - imag(a)*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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// X_(i+1) = { imag(result[i]) + imag(y[i]), real(result[i]) + real(y[i]) }
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ADDPD (DX)(AX*8), X3
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ADDPD 16(DX)(AX*8), X5
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ADDPD 32(DX)(AX*8), X7
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ADDPD 48(DX)(AX*8), X9
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MOVUPS X3, (DI)(AX*8) // y[i] = X_(i+1)
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MOVUPS X5, 16(DI)(AX*8)
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MOVUPS X7, 32(DI)(AX*8)
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MOVUPS X9, 48(DI)(AX*8)
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ADDQ $8, AX // i += 8
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DECQ BX
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JNZ caxy_loop // } while --BX > 0
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CMPQ CX, $0 // if CX == 0 { return }
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JE caxy_end
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caxy_tail: // Same calculation, but read in values to avoid trampling memory
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MOVUPS (SI)(AX*8), 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 X1, X2 // X_i = { real(a) * imag(x[i]), imag(a) * imag(x[i]) }
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MULPD X0, X3 // X_(i+1) = { imag(a) * real(x[i]), real(a) * real(x[i]) }
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// X_(i+1) = {
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// imag(result[i]): imag(a)*real(x[i]) + real(a)*imag(x[i]),
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// real(result[i]): real(a)*real(x[i]) - imag(a)*imag(x[i])
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// }
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ADDSUBPD_X2_X3
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// X_(i+1) = { imag(result[i]) + imag(y[i]), real(result[i]) + real(y[i]) }
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ADDPD (DX)(AX*8), X3
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MOVUPS X3, (DI)(AX*8) // y[i] = X_(i+1)
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ADDQ $2, AX // i += 2
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LOOP caxy_tail // } while --CX > 0
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caxy_end:
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RET
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