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75 lines
2.3 KiB
75 lines
2.3 KiB
.file "isnan.s"
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// Copyright (c) 2000, 2001, Intel Corporation
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// All rights reserved.
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//
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// Contributed 2/2/2000 by John Harrison, Ted Kubaska, Bob Norin, Shane Story,
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// and Ping Tak Peter Tang of the Computational Software Lab, Intel Corporation.
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//
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// WARRANTY DISCLAIMER
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//
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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://developer.intel.com/opensource.
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//
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// History
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//==============================================================
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// 2/02/00: Initial version
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.align 32
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.global _isnan#
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.section .text
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.proc _isnan#
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.align 32
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// API
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//==============================================================
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// int _isnan (double x)
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// Overview of operation
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//==============================================================
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// returns 1 if x is a nan; 0 otherwise
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// takes no exceptions
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// Registers used
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//==============================================================
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// general registers used:
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// r8 for return value
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// floating-point registers used:
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// f8
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// predicate registers used
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// p6, p7
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// qnan snan inf norm unorm 0 -+
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// 1 1 0 0 0 0 11
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_isnan:
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{ .mfi
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nop.m 999
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fclass.m.unc p6,p7 = f8,0xc3
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nop.i 999 ;;
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}
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{ .mib
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(p6) addl r8 = 0x1,r0
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(p7) addl r8 = 0x0,r0
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br.ret.sptk b0 ;;
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}
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.endp _isnan
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