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[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / internal / asm / f64 / divto_amd64.s

diff --git a/vendor/gonum.org/v1/gonum/internal/asm/f64/divto_amd64.s b/vendor/gonum.org/v1/gonum/internal/asm/f64/divto_amd64.s
new file mode 100644 (file)
index 0000000..e30e807
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+++ b/vendor/gonum.org/v1/gonum/internal/asm/f64/divto_amd64.s
@@ -0,0 +1,73 @@
+// Copyright ©2016 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,!appengine
+
+#include "textflag.h"
+
+// func DivTo(dst, x, y []float64)
+TEXT ·DivTo(SB), NOSPLIT, $0
+       MOVQ    dst_base+0(FP), DI // DI = &dst
+       MOVQ    dst_len+8(FP), CX  // CX = len(dst)
+       MOVQ    x_base+24(FP), SI  // SI = &x
+       MOVQ    y_base+48(FP), DX  // DX = &y
+       CMPQ    x_len+32(FP), CX   // CX = max( len(dst), len(x), len(y) )
+       CMOVQLE x_len+32(FP), CX
+       CMPQ    y_len+56(FP), CX
+       CMOVQLE y_len+56(FP), CX
+       MOVQ    CX, ret_len+80(FP) // len(ret) = CX
+       CMPQ    CX, $0             // if CX == 0 { return }
+       JE      div_end
+       XORQ    AX, AX             // i = 0
+       MOVQ    DX, BX
+       ANDQ    $15, BX            // BX = &y & OxF
+       JZ      div_no_trim        // if BX == 0 { goto div_no_trim }
+
+       // Align on 16-bit boundary
+       MOVSD (SI)(AX*8), X0 // X0 = s[i]
+       DIVSD (DX)(AX*8), X0 // X0 /= t[i]
+       MOVSD X0, (DI)(AX*8) // dst[i] = X0
+       INCQ  AX             // ++i
+       DECQ  CX             // --CX
+       JZ    div_end        // if CX == 0 { return }
+
+div_no_trim:
+       MOVQ CX, BX
+       ANDQ $7, BX         // BX = len(dst) % 8
+       SHRQ $3, CX         // CX = floor( len(dst) / 8 )
+       JZ   div_tail_start // if CX == 0 { goto div_tail_start }
+
+div_loop: // Loop unrolled 8x   do {
+       MOVUPS (SI)(AX*8), X0   // X0 = x[i:i+1]
+       MOVUPS 16(SI)(AX*8), X1
+       MOVUPS 32(SI)(AX*8), X2
+       MOVUPS 48(SI)(AX*8), X3
+       DIVPD  (DX)(AX*8), X0   // X0 /= y[i:i+1]
+       DIVPD  16(DX)(AX*8), X1
+       DIVPD  32(DX)(AX*8), X2
+       DIVPD  48(DX)(AX*8), X3
+       MOVUPS X0, (DI)(AX*8)   // dst[i:i+1] = X0
+       MOVUPS X1, 16(DI)(AX*8)
+       MOVUPS X2, 32(DI)(AX*8)
+       MOVUPS X3, 48(DI)(AX*8)
+       ADDQ   $8, AX           // i += 8
+       LOOP   div_loop         // } while --CX > 0
+       CMPQ   BX, $0           // if BX == 0 { return }
+       JE     div_end
+
+div_tail_start: // Reset loop registers
+       MOVQ BX, CX // Loop counter: CX = BX
+
+div_tail: // do {
+       MOVSD (SI)(AX*8), X0 // X0  = x[i]
+       DIVSD (DX)(AX*8), X0 // X0 /= y[i]
+       MOVSD X0, (DI)(AX*8)
+       INCQ  AX             // ++i
+       LOOP  div_tail       // } while --CX > 0
+
+div_end:
+       MOVQ DI, ret_base+72(FP) // &ret = &dst
+       MOVQ dst_cap+16(FP), DI  // cap(ret) = cap(dst)
+       MOVQ DI, ret_cap+88(FP)
+       RET