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115 lines
3.4 KiB
ArmAsm
115 lines
3.4 KiB
ArmAsm
.file "fmax.s"
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// Copyright (c) 2001 - 2003, Intel Corporation
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// All rights reserved.
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//
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// Contributed 2001 by the Intel Numerics Group, Intel Corporation
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// * The name of Intel Corporation may not be used to endorse or promote
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// products derived from this software without specific prior written
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// permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Intel Corporation is the author of this code, and requests that all
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// problem reports or change requests be submitted to it directly at
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// http://www.intel.com/software/products/opensource/libraries/num.htm.
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//
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// History
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//==============================================================
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// 05/31/01 Initial version
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// 05/20/02 Cleaned up namespace and sf0 syntax
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// 02/10/03 Reordered header: .section, .global, .proc, .align
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//
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// API
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//==============================================================
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// double fmax (double x, double y)
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//
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// Overview of operation
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//==============================================================
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// returns the algebraic maximum of 2 input values
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//
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// Special cases:
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// fmax(x, nan) returns x if x is numeric // Must special case this one
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// fmax(nan, y) returns y if y is numeric
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// fmax(nan1, nan2) returns quietized nan2
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// fmax(+0,+0) returns +0
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// fmax(-0,+0) returns +0
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// fmax(-0,-0) returns -0
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// fmax(+0,-0) returns +0 // Must special case this one
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//
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// SNaN causes invalid to be set
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// floating-point registers used: 2
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// f8, input x, output
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// f9, input y
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.section .text
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GLOBAL_LIBM_ENTRY(fmax)
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{ .mfi
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nop.m 999
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fcmp.unord.s0 p6,p7 = f8, f9 // Is x or y a nan? Raise invalid or denormal
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nop.i 999
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}
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;;
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{ .mfi
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nop.m 999
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(p7) fclass.m.unc p8,p9 = f9, 0x06 // If no nan, is y=-0?
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nop.i 999
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}
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;;
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{ .mfi
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nop.m 999
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(p6) fclass.m.unc p10,p0 = f8, 0xc3 // Is x nan?
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nop.i 999
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}
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;;
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{ .mfi
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nop.m 999
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(p9) fmax.s0 f8 = f8, f9 // Normal case, no nan and y not -0
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nop.i 999
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}
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;;
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{ .mfi
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nop.m 999
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(p8) fmax.s0 f8 = f9, f8 // No nan and y -0
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nop.i 999
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}
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;;
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{ .mfb
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nop.m 999
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(p10) fmerge.s f8 = f9, f9 // If x nan, return y, else do nothing (returns x)
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br.ret.sptk b0
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}
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;;
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GLOBAL_LIBM_END(fmax)
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