xref: /src/sys/lib/libkern/arch/ia64/divdi3.S

.file "__divdi3.s"

// $NetBSD: divdi3.S,v 1.2 2006/04/07 14:27:33 cherry Exp $

//-
// Copyright (c) 2000, Intel Corporation
// All rights reserved.
//
// Contributed 2/15/2000 by Marius Cornea, John Harrison, Cristina Iordache,
// Ted Kubaska, Bob Norin, and Shane Story of the Computational Software Lab,
// Intel Corporation.
//
// WARRANTY DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Intel Corporation is the author of this code, and requests that all
// problem reports or change requests be submitted to it directly at
// http://developer.intel.com/opensource.
//

.section .text
.proc __divdi3#
.align 32
.global __divdi3#
.align 32

// 64-bit signed integer divide

__divdi3:

{ .mii
  alloc r31=ar.pfs,2,0,0,0
  nop.i 0
  nop.i 0;;
} { .mmi

  // 64-BIT SIGNED INTEGER DIVIDE BEGINS HERE

  setf.sig f8=r32
  setf.sig f9=r33
  nop.i 0;;
} { .mfb
  nop.m 0
  fcvt.xf f6=f8
  nop.b 0
} { .mfb
  nop.m 0
  fcvt.xf f7=f9
  nop.b 0;;
} { .mfi
  nop.m 0
  // Step (1)
  // y0 = 1 / b in f8
  frcpa.s1 f8,p6=f6,f7
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (2)
  // e0 = 1 - b * y0 in f9
  (p6) fnma.s1 f9=f7,f8,f1
  nop.i 0
} { .mfi
  nop.m 0
  // Step (3)
  // q0 = a * y0 in f10
  (p6) fma.s1 f10=f6,f8,f0
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (4)
  // e1 = e0 * e0 in f11
  (p6) fma.s1 f11=f9,f9,f0
  nop.i 0
} { .mfi
  nop.m 0
  // Step (5)
  // q1 = q0 + e0 * q0 in f10
  (p6) fma.s1 f10=f9,f10,f10
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (6)
  // y1 = y0 + e0 * y0 in f8
  (p6) fma.s1 f8=f9,f8,f8
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (7)
  // q2 = q1 + e1 * q1 in f9
  (p6) fma.s1 f9=f11,f10,f10
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (8)
  // y2 = y1 + e1 * y1 in f8
  (p6) fma.s1 f8=f11,f8,f8
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (9)
  // r2 = a - b * q2 in f10
  (p6) fnma.s1 f10=f7,f9,f6
  nop.i 0;;
} { .mfi
  nop.m 0
  // Step (10)
  // q3 = q2 + r2 * y2 in f8
  (p6) fma.s1 f8=f10,f8,f9
  nop.i 0;;
} { .mfb
  nop.m 0
  // Step (11)
  // q = trunc (q3)
  fcvt.fx.trunc.s1 f8=f8
  nop.b 0;;
} { .mmi
  // quotient will be in r8 (if b != 0)
  getf.sig r8=f8
  nop.m 0
  nop.i 0;;
}

  // 64-BIT SIGNED INTEGER DIVIDE ENDS HERE

{ .mmb
  nop.m 0
  nop.m 0
  br.ret.sptk b0;;
}

.endp __divdi3