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68 lines
1.9 KiB
ArmAsm
68 lines
1.9 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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// func Div(dst, s []float64)
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TEXT ·Div(SB), NOSPLIT, $0
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MOVQ dst_base+0(FP), DI // DI = &dst
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MOVQ dst_len+8(FP), CX // CX = len(dst)
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MOVQ s_base+24(FP), SI // SI = &s
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CMPQ s_len+32(FP), CX // CX = max( CX, len(s) )
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CMOVQLE s_len+32(FP), CX
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CMPQ CX, $0 // if CX == 0 { return }
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JE div_end
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XORQ AX, AX // i = 0
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MOVQ SI, BX
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ANDQ $15, BX // BX = &s & 15
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JZ div_no_trim // if BX == 0 { goto div_no_trim }
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// Align on 16-bit boundary
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MOVSD (DI)(AX*8), X0 // X0 = dst[i]
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DIVSD (SI)(AX*8), X0 // X0 /= s[i]
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MOVSD X0, (DI)(AX*8) // dst[i] = X0
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INCQ AX // ++i
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DECQ CX // --CX
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JZ div_end // if CX == 0 { return }
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div_no_trim:
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MOVQ CX, BX
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ANDQ $7, BX // BX = len(dst) % 8
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SHRQ $3, CX // CX = floor( len(dst) / 8 )
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JZ div_tail_start // if CX == 0 { goto div_tail_start }
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div_loop: // Loop unrolled 8x do {
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MOVUPS (DI)(AX*8), X0 // X0 = dst[i:i+1]
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MOVUPS 16(DI)(AX*8), X1
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MOVUPS 32(DI)(AX*8), X2
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MOVUPS 48(DI)(AX*8), X3
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DIVPD (SI)(AX*8), X0 // X0 /= s[i:i+1]
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DIVPD 16(SI)(AX*8), X1
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DIVPD 32(SI)(AX*8), X2
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DIVPD 48(SI)(AX*8), X3
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MOVUPS X0, (DI)(AX*8) // dst[i] = X0
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MOVUPS X1, 16(DI)(AX*8)
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MOVUPS X2, 32(DI)(AX*8)
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MOVUPS X3, 48(DI)(AX*8)
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ADDQ $8, AX // i += 8
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LOOP div_loop // } while --CX > 0
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CMPQ BX, $0 // if BX == 0 { return }
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JE div_end
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div_tail_start: // Reset loop registers
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MOVQ BX, CX // Loop counter: CX = BX
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div_tail: // do {
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MOVSD (DI)(AX*8), X0 // X0 = dst[i]
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DIVSD (SI)(AX*8), X0 // X0 /= s[i]
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MOVSD X0, (DI)(AX*8) // dst[i] = X0
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INCQ AX // ++i
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LOOP div_tail // } while --CX > 0
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div_end:
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RET
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