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-.file "modf.s"
-
-
-// Copyright (c) 2000 - 2003, Intel Corporation
-// All rights reserved.
-//
-// Contributed 2000 by the Intel Numerics Group, Intel Corporation
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// * Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-//
-// * The name of Intel Corporation may not be used to endorse or promote
-// products derived from this software without specific prior written
-// permission.
-
-// 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://www.intel.com/software/products/opensource/libraries/num.htm.
-//
-// History
-//==============================================================
-// 02/02/00 Initial version
-// 04/04/00 Improved speed, corrected result for NaN input
-// 12/22/00 Fixed so inexact flag is never set, and invalid is not set for 
-//            qnans nor for inputs larger than 2^63.
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 02/10/03 Reordered header: .section, .global, .proc, .align
-//
-// API
-//==============================================================
-// double modf(double x, double *iptr)
-// break a floating point x number into fraction and an exponent
-//
-// input  floating point f8, address in r33
-// output floating point f8 (x fraction), and *iptr (x integral part)
-//
-// OVERVIEW
-//==============================================================
-//
-// NO FRACTIONAL PART: HUGE
-// If
-// for double-extended
-// If the true exponent is greater than or equal 63
-//      1003e ==> 1003e -ffff = 3f = 63(dec)
-// for double
-// If the true exponent is greater than or equal 52
-//                10033 -ffff = 34 = 52(dec)
-// for single
-// If the true exponent is greater than or equal 23
-//                10016 -ffff = 17 = 23(dec)
-// then
-// we are already an integer (p9 true)
-
-// NO INTEGER PART:    SMALL
-//     Is f8 exponent less than register bias (that is, is it
-//     less than 1). If it is, get the right sign of
-//     zero and store this in iptr.
-
-// CALCULATION: NOT HUGE, NOT SMALL
-// To get the integer part
-// Take the floating-point  input and truncate 
-//   then convert  this integer to fp  Call it  MODF_INTEGER_PART
-
-// Subtract  MODF_INTEGER_PART from MODF_NORM_F8 to get fraction part
-// Then put fraction part in f8 
-//      put integer  part MODF_INTEGER_PART into *iptr
-
-// Registers used
-//==============================================================
-
-// predicate registers used: 
-// p6 - p13
-
-//                      0xFFFF           0x10033
-// -----------------------+-----------------+-------------
-//              SMALL     |      NORMAL     | HUGE
-//    p11 --------------->|<----- p12 ----->| <-------------- p9
-//    p10 --------------------------------->|
-//    p13 --------------------------------------------------->|
-//
-
-// floating-point registers used: 
-MODF_NORM_F8               = f9
-MODF_FRACTION_PART         = f10
-MODF_INTEGER_PART          = f11
-MODF_INT_INTEGER_PART      = f12
-
-
-// general registers used 
-modf_signexp    = r14
-modf_GR_no_frac = r15
-modf_GR_FFFF    = r16
-modf_17_ones    = r17 
-modf_exp        = r18
-// r33 = iptr
-     
-
-.section .text
-GLOBAL_LIBM_ENTRY(modf)
-
-// Main path is p9, p11, p8 FALSE and p12 TRUE
-
-// Assume input is normalized and get signexp
-// Normalize input just in case
-// Form exponent bias 
-{ .mfi
-      getf.exp  modf_signexp = f8
-      fnorm.s0          MODF_NORM_F8  = f8
-      addl           modf_GR_FFFF  = 0xffff, r0
-}
-// Get integer part of input
-// Form exponent mask
-{ .mfi
-      nop.m 999
-      fcvt.fx.trunc.s1  MODF_INT_INTEGER_PART   = f8
-      mov  modf_17_ones     = 0x1ffff ;;
-}
-
-// Is x nan or inf?
-// qnan snan inf norm     unorm 0 -+
-// 1    1    1   0        0     0 11 = 0xe3 NAN_INF
-// Form biased exponent where input only has an integer part
-{ .mfi
-      nop.m 999
-      fclass.m.unc p6,p13 = f8, 0xe3
-      addl modf_GR_no_frac = 0x10033, r0 ;;
-}
-
-// Mask to get exponent
-// Is x unnorm?
-// qnan snan inf norm     unorm 0 -+
-// 0    0    0   0        1     0 11 = 0x0b UNORM
-// Set p13 to indicate calculation path, else p6 if nan or inf 
-{ .mfi
-      and       modf_exp = modf_17_ones, modf_signexp 
-      fclass.m.unc p8,p0 = f8, 0x0b
-      nop.i 999 ;;
-}
-
-// p11 <== SMALL, no integer part, fraction is everyting
-// p9  <== HUGE,  no fraction part, integer is everything
-// p12 <== NORMAL, fraction part and integer part
-{ .mii
-(p13) cmp.lt.unc p11,p10 = modf_exp, modf_GR_FFFF
-      nop.i 999
-      nop.i 999 ;;
-}
-
-// Is x inf? p6 if inf, p7 if nan
-{ .mfb
-(p10) cmp.ge.unc p9,p12  = modf_exp, modf_GR_no_frac
-(p6)  fclass.m.unc p6,p7 = f8, 0x23
-(p8)  br.cond.spnt MODF_DENORM ;;
-}
-
-MODF_COMMON:
-// For HUGE set fraction to signed 0
-{ .mfi
-      nop.m 999
-(p9)  fmerge.s f8 = f8,f0
-      nop.i 999
-}
-// For HUGE set integer part to normalized input
-{ .mfi
-      nop.m 999
-(p9)  fnorm.d.s0 MODF_INTEGER_PART = MODF_NORM_F8
-      nop.i 999 ;;
-}
-
-// For SMALL set fraction to normalized input, integer part to signed 0
-{ .mfi
-      nop.m 999
-(p11) fmerge.s MODF_INTEGER_PART = f8,f0
-      nop.i 999
-}
-{ .mfi
-      nop.m 999
-(p11) fnorm.d.s0 f8 = MODF_NORM_F8
-      nop.i 999 ;;
-}
-
-// For NORMAL float the integer part
-{ .mfi
-      nop.m 999
-(p12) fcvt.xf    MODF_INTEGER_PART = MODF_INT_INTEGER_PART
-      nop.i 999 ;;
-}
-
-// If x inf set integer part to INF, fraction to signed 0
-{ .mfi
-(p6)  stfd [r33] = MODF_NORM_F8
-(p6)  fmerge.s  f8 = f8,f0
-      nop.i 999 ;;
-}
-
-// If x nan set integer and fraction parts to NaN (quietized)
-{ .mfi
-(p7)  stfd [r33] = MODF_NORM_F8
-(p7)  fmerge.s  f8 = MODF_NORM_F8, MODF_NORM_F8
-      nop.i 999 ;;
-}
-
-{ .mmi
-(p9)  stfd [r33] = MODF_INTEGER_PART
-      nop.m 999
-      nop.i 999 ;;
-}
-
-// For NORMAL compute fraction part
-{ .mfi
-(p11) stfd [r33] = MODF_INTEGER_PART
-(p12) fms.d.s0   f8 = MODF_NORM_F8,f1, MODF_INTEGER_PART
-      nop.i 999 ;;
-}
-
-// For NORMAL test if fraction part is zero; if so append correct sign
-{ .mfi
-      nop.m 999
-(p12) fcmp.eq.unc.s0 p7,p0 = MODF_NORM_F8, MODF_INTEGER_PART
-      nop.i 999 ;;
-}
-
-{ .mfi
-(p12) stfd [r33] = MODF_INTEGER_PART
-      nop.f 999
-      nop.i 999 ;;
-}
-
-// For NORMAL if fraction part is zero append sign of input
-{ .mfb
-      nop.m 999
-(p7)  fmerge.s f8 = MODF_NORM_F8, f0
-      br.ret.sptk    b0 ;;
-}
-
-MODF_DENORM:
-// If x unorm get signexp from normalized input
-// If x unorm get integer part from normalized input
-{ .mfi
-      getf.exp  modf_signexp = MODF_NORM_F8
-      fcvt.fx.trunc.s1  MODF_INT_INTEGER_PART   = MODF_NORM_F8
-      nop.i 999 ;;
-}
-
-// If x unorm mask to get exponent
-{ .mmi
-      and       modf_exp = modf_17_ones, modf_signexp ;;
-      cmp.lt.unc p11,p10 = modf_exp, modf_GR_FFFF
-      nop.i 999 ;;
-}
-
-{ .mfb
-(p10) cmp.ge.unc p9,p12  = modf_exp, modf_GR_no_frac
-      nop.f 999
-      br.cond.spnt MODF_COMMON ;;
-}
-
-GLOBAL_LIBM_END(modf)