.file "significand.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 Unwind support added// 05/31/00 Fixed bug when x a double-extended denormal// 05/20/02 Cleaned up namespace and sf0 syntax// 02/10/03 Reordered header: .section, .global, .proc, .align//// API//==============================================================// double significand(double x)//// Overview of operation//==============================================================// If x = sig * 2**n with 1 <= sig < 2// significand returns sig//// predicate registers used: // p6, p7//// floating-point registers used:  // f8, f9, f10 .section .textGLOBAL_LIBM_ENTRY(significand)// qnan snan inf norm     unorm 0 -+// 1    1    1   0        0     1 11// f10 gets f8(sign) with f1(exp,significand){ .mfi      nop.m 999      fmerge.s       f10 = f8,f1                     nop.i 999}{ .mfi      nop.m 999      fnorm.s0          f9  = f8                        nop.i 999 ;;}// Test for denormal input{ .mfi      nop.m 999      fclass.m.unc   p7,p0 = f8, 0x0b      nop.i 999 ;;}// p6 = TRUE ==> x is not (nan,inf,0)//               return sign(f8) exp(f1) significand(f8)// else          x is (nan,inf,0)//               return sign(f8) exp(f8) significand(f8), normalized.{ .mfi      nop.m 999      fclass.m.unc   p0,p6 = f8, 0xe7                nop.i 999 ;;}{ .mmb      nop.m 999      nop.m 999(p7)  br.cond.spnt SIGNIFICAND_DENORM ;; // Branch if x denormal}{ .mfi      nop.m 999(p6)  fmerge.se      f8 = f10,f8      nop.i 999 ;;}{ .mfb      nop.m 999      fnorm.d.s0        f8 = f8                         br.ret.sptk    b0 ;;}SIGNIFICAND_DENORM:// Here if x denorm{ .mfi      nop.m 999      fmerge.se      f8 = f10,f9      nop.i 999 ;;}// Check if fnorm(x) still denormal, means x double-extended denormal{ .mfi      nop.m 999      fclass.m.unc   p7,p0 = f9, 0x0b      nop.i 999 ;;}// This will be the final result unless x double-extended denormal{ .mfi      nop.m 999      fnorm.d.s0        f8 = f8      nop.i 999 ;;}// If x double-extended denorm, then significand ok, but must merge in//    correct signexp{ .mfi      nop.m 999(p7)  fmerge.se      f8 = f10,f8      nop.i 999 ;;}// Final normalization if x double-extended denorm{ .mfb      nop.m 999(p7)  fnorm.d.s0        f8 = f8      br.ret.sptk    b0 ;;}GLOBAL_LIBM_END(significand)