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-.file "libm_frexp.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
-//==============================================================
-// double __libm_frexp(double x, int* y, int int_type)
-// input floating point f8, pointer to y (r33), int int_type (r34)
-// 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 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 on input contains the 64-bit IEEE double that is in f8
-// r33 on input pointer to 32-bit or 64-bit integer for exponent
-// r34 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_frexp)
-
-// 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 = r34, r0 ;;
-}
-
-// If x NAN, ZERO, INFINITY, set *y=0 and exit
-{ .mmb
-(p10) st4 [r33] = r0 // Store *y=0 as 32-bit integer
-(p11) st8 [r33] = 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 = r34, 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 r33
-
-// 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 double
-{ .mfi
-(p10) st4 [r33] = r19 // Store *y as 32-bit integer
- fnorm.d.s0 f8 = f8
- nop.i 999
-}
-{ .mfb
-(p11) st8 [r33] = r19 // Store *y as 64-bit integer
- nop.f 999
- br.ret.sptk b0 ;;
-}
-
-GLOBAL_LIBM_END(__libm_frexp)