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-.file "libm_frexpl.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
-// 03/20/00 Improved speed
-// 06/01/00 Fixed bug when x a double-extended denormal
-// 12/08/00 Corrected label on .endp
-// 01/23/02 Added handling for int 32 or 64 bits
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 02/10/03 Reordered header: .section, .global, .proc, .align
-//
-// API
-//==============================================================
-// long double __libm_frexpl(long double x, int* y, int int_type)
-// input  floating point f8, pointer to y (r34), int int_type (r35)
-// output floating point f8, returns the fraction of x, 0.5 <= fraction < 1.0
-// output int* y, returns the true exponent of x
-//
-// int_type = 0 if int is 32 bits
-// int_type = 1 if int is 64 bits
-//
-// int* y is returned as a 32 bit integer if int_type = 0
-// int* y is returned as a 64 bit integer if int_type = 1
-//
-// Overview of operation
-//==============================================================
-// break a floating point x number into fraction and an exponent
-// The fraction is returned as a long double
-// The exponent is returned as an integer pointed to by y
-//    This is a true (not a biased exponent) but 0fffe is subtracted
-//    as a bias instead of 0xffff. This is because the fraction returned
-//    is between 0.5 and 1.0, not the expected IEEE range.
-//
-// The fraction is 0.5 <= fraction < 1.0
-//
-// Registers used
-//==============================================================
-//
-// general registers: 
-// r14  exponent bias for x negative
-// r15  exponent bias for x positive
-// r16  signexp of x
-// r17  exponent mask
-// r18  exponent of x
-// r19  exponent result
-// r20  signexp of 2^64
-// r32-33  on input contains the 80-bit IEEE long double that is in f8
-// r34  on input pointer to 32-bit or 64-bit integer for exponent
-// r35  on input contains 0 if output int is 32 bits, else output int is 64 bits
-//
-// predicate registers:
-// p6   set if x is Nan, zero, or infinity
-// p7   set if x negative
-// p8   set if x positive
-// p9   set if x double-extended denormal
-// p10  set if int_type = 0, 32-bit integer
-// p11  set if int_type = 1, 64-bit integer
-//
-// floating-point registers:
-// f8  input, output
-// f9  normalized x
-// f10 signexp for significand result for x positive
-// f11 signexp for significand result for x negative
-// f12 2^64
-
-.section .text
-GLOBAL_LIBM_ENTRY(__libm_frexpl)
-
-// Set signexp for significand result for x>0
-// If x is a NaN, zero, or infinity, return it.
-// Put 0 in the int pointer.
-// x NAN, ZERO, INFINITY?
-// Set signexp for significand result for x<0
-{ .mfi
-        mov         r15 = 0x0fffe
-        fclass.m    p6,p7 = f8, 0xe7
-        mov         r14 = 0x2fffe
-}
-// Form signexp of 2^64 in case x double-extended denormal
-// Save the normalized value of input in f9
-// The normalization also sets fault flags and takes faults if necessary
-{ .mfi
-        mov         r20 = 0x1003f
-        fnorm.s0    f9 = f8 
-        nop.i 999 ;;
-}
-
-// Move signexp for significand result for x>0 to FP reg
-// Form 2^64 in case x double-extended denormal
-{ .mmi
-        setf.exp    f10 = r15
-        setf.exp    f12 = r20
-        nop.i 999 ;;
-}
-
-// Move signexp for significand result for x<0 to FP reg
-// p7 if x<0, else p8
-// If x=0,nan,inf, set p10 if output int to be 32 bits, or set p11 if 64 bits
-{ .mfi
-        setf.exp    f11 = r14
-(p7)    fcmp.lt.s0  p7,p8 = f8,f0
-(p6)    cmp.eq.unc  p10,p11 = r35, r0 ;; 
-}
-
-// If x NAN, ZERO, INFINITY, set *y=0 and exit
-{ .mmb
-(p10)   st4         [r34] = r0      // Store *y=0 as 32-bit integer
-(p11)   st8         [r34] = r0      // Store *y=0 as 64-bit integer
-(p6)    br.ret.spnt b0 ;;
-}
-
-// Form exponent mask
-// Test for fnorm(x) denormal, means x double-extended denormal
-{ .mfi
-        mov         r17 = 0x1ffff
-        fclass.m    p9,p0 = f9, 0x0b
-        nop.i 999 ;;
-}
-
-// If x double-extended denormal add 64 to exponent bias for scaling
-// If x double-extended denormal multiply x * 2^64 which is normal
-// Set p10 if output int to be 32 bits, or set p11 if 64 bits
-{ .mfi
-(p9)    add         r15 = 64, r15
-(p9)    fmpy.s0     f9 = f9, f12
-        cmp.eq      p10,p11 = r35, r0 ;; 
-}
-
-// true exponent stored to int pointer
-// the bias is treated as 0xfffe instead of 
-// normal 0xffff because we want the significand
-// to be in the range <=0.5 sig < 1.0
-// Store the value of the exponent at the pointer in r34
-
-// If x>0 form significand result 
-{ .mfi
-        nop.m 999
-(p8)    fmerge.se   f8 = f10,f9
-        nop.i 999  ;;
-}
-
-// Get signexp of normalized x
-// If x<0 form significand result 
-{ .mfi
-        getf.exp    r16 = f9
-(p7)    fmerge.se   f8 = f11,f9
-        nop.i 999  ;;
-}
-
-// Get exp of normalized x
-// Subtract off bias to get true exponent of x
-{ .mmi
-        and         r18 = r17,r16 ;;
-        sub         r19 = r18,r15
-        nop.i 999  ;;
-}
-
-// Store int *y as a 32-bit integer
-// Make the value a long double
-{ .mfi
-(p10)   st4         [r34] = r19        // Store *y as 32-bit integer
-        fnorm.s0    f8 = f8
-        nop.i 999
-}
-{ .mfb
-(p11)   st8         [r34] = r19        // Store *y as 64-bit integer
-        nop.f 999
-        br.ret.sptk b0 ;;
-}
-
-GLOBAL_LIBM_END(__libm_frexpl)