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| Current File : //sys/libkern/ia64/__udivdi3.S |
.file "__udivdi3.s"
// $FreeBSD: release/9.1.0/sys/libkern/ia64/__udivdi3.S 139815 2005-01-07 00:24:33Z imp $
//-
// 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 __udivdi3#
.align 32
.global __udivdi3#
.align 32
// 64-bit unsigned integer divide
__udivdi3:
{ .mii
alloc r31=ar.pfs,2,0,0,0
nop.i 0
nop.i 0;;
}
{ .mmi
// 64-BIT UNSIGNED INTEGER DIVIDE BEGINS HERE
setf.sig f8=r32
setf.sig f9=r33
nop.i 0;;
} { .mfb
nop.m 0
fma.s1 f6=f8,f1,f0
nop.b 0
} { .mfb
nop.m 0
fma.s1 f7=f9,f1,f0
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
// (11) q = trunc(q3)
fcvt.fxu.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 UNSIGNED INTEGER DIVIDE ENDS HERE
{ .mmb
nop.m 0
nop.m 0
br.ret.sptk b0;;
}
.endp __udivdi3