sysdeps/ia64/fpu/s_fmaxf.S

   1 .file "fmaxf.s"
   2
   3
   4 // Copyright (c) 2001 - 2003, Intel Corporation
   5 // All rights reserved.
   6 //
   7 // Contributed 2001 by the Intel Numerics Group, Intel Corporation
   8 //
   9 // Redistribution and use in source and binary forms, with or without
  10 // modification, are permitted provided that the following conditions are
  11 // met:
  12 //
  13 // * Redistributions of source code must retain the above copyright
  14 // notice, this list of conditions and the following disclaimer.
  15 //
  16 // * Redistributions in binary form must reproduce the above copyright
  17 // notice, this list of conditions and the following disclaimer in the
  18 // documentation and/or other materials provided with the distribution.
  19 //
  20 // * The name of Intel Corporation may not be used to endorse or promote
  21 // products derived from this software without specific prior written
  22 // permission.
  23
  24 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
  28 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  32 // OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
  33 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35 //
  36 // Intel Corporation is the author of this code, and requests that all
  37 // problem reports or change requests be submitted to it directly at
  38 // http://www.intel.com/software/products/opensource/libraries/num.htm.
  39 //
  40 // History
  41 //==============================================================
  42 // 05/31/01 Initial version
  43 // 05/20/02 Cleaned up namespace and sf0 syntax
  44 // 02/10/03 Reordered header: .section, .global, .proc, .align
  45 //
  46 // API
  47 //==============================================================
  48 // float fmaxf  (float x, float y)
  49 //
  50 // Overview of operation
  51 //==============================================================
  52 // returns the algebraic maximum of 2 input values
  53 //
  54 // Special cases:
  55 //    fmaxf(x, nan) returns x if x is numeric  // Must special case this one
  56 //    fmaxf(nan, y) returns y if y is numeric
  57 //    fmaxf(nan1, nan2) returns quietized nan2
  58 //    fmaxf(+0,+0) returns +0
  59 //    fmaxf(-0,+0) returns +0
  60 //    fmaxf(-0,-0) returns -0
  61 //    fmaxf(+0,-0) returns +0                  // Must special case this one
  62 //
  63 // SNaN causes invalid to be set
  64
  65 // floating-point registers used: 2
  66 // f8,  input x, output
  67 // f9,  input y
  68
  69 .section .text
  70 GLOBAL_LIBM_ENTRY(fmaxf)
  71
  72 { .mfi
  73       nop.m 999
  74       fcmp.unord.s0 p6,p7 = f8, f9 // Is x or y a nan? Raise invalid or denormal
  75       nop.i 999
  76 }
  77 ;;
  78
  79 { .mfi
  80       nop.m 999
  81 (p7)  fclass.m.unc  p8,p9 = f9, 0x06 // If no nan, is y=-0?
  82       nop.i 999
  83 }
  84 ;;
  85
  86 { .mfi
  87       nop.m 999
  88 (p6)  fclass.m.unc  p10,p0 = f8, 0xc3 // Is x nan?
  89       nop.i 999
  90 }
  91 ;;
  92
  93 { .mfi
  94       nop.m 999
  95 (p9)  fmax.s0  f8 = f8, f9    // Normal case, no nan and y not -0
  96       nop.i 999
  97 }
  98 ;;
  99
 100 { .mfi
 101       nop.m 999
 102 (p8)  fmax.s0  f8 = f9, f8    // No nan and y -0
 103       nop.i 999
 104 }
 105 ;;
 106
 107 { .mfb
 108       nop.m 999
 109 (p10) fmerge.s  f8 = f9, f9   // If x nan, return y, else do nothing (returns x)
 110       br.ret.sptk    b0
 111 }
 112 ;;
 113
 114 GLOBAL_LIBM_END(fmaxf)