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Diffstat (limited to 'sysdeps/ia64/fpu/libm_frexp4.S')
| -rw-r--r-- | sysdeps/ia64/fpu/libm_frexp4.S | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/sysdeps/ia64/fpu/libm_frexp4.S b/sysdeps/ia64/fpu/libm_frexp4.S deleted file mode 100644 index 08c2de6766..0000000000 --- a/sysdeps/ia64/fpu/libm_frexp4.S +++ /dev/null @@ -1,199 +0,0 @@ -.file "libm_frexp_4.s" - -// Copyright (C) 2000, 2001, Intel Corporation -// All rights reserved. -// -// Contributed 2/2/2000 by John Harrison, Ted Kubaska, Bob Norin, Shane Story, -// and Ping Tak Peter Tang of the Computational Software Lab, 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://developer.intel.com/opensource. -// -// History -//============================================================== -// 2/02/00: Initial version -// 3/20/00: Improved speed -// 6/01/00: Fixed bug when x a double-extended denormal -// 12/08/00 Corrected label on .endp -// -// API -//============================================================== -// double frexp(double x, int* y) -// double __libm_frexp_4(double x, int* y) -// where int* y is a 32-bit integer -// -// 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 integer for exponent -// -// 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 -// -// 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 - -#include "libm_support.h" - -.align 32 -.global __libm_frexp_4# - -.section .text -.proc __libm_frexp_4# -.align 32 - -__libm_frexp_4: - -// 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 -(p0) mov r15 = 0x0fffe -(p0) fclass.m.unc p6,p0 = f8, 0xe7 -(p0) 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 -(p0) mov r20 = 0x1003f -(p0) fnorm 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 -(p0) setf.exp f10 = r15 -(p0) setf.exp f12 = r20 - nop.i 999 ;; -} - -// Move signexp for significand result for x<0 to FP reg -// If x NAN, ZERO, INFINITY, set *y=0 as a 32-bit integer, and exit -{ .mmb -(p0) setf.exp f11 = r14 -(p6) st4 [r33] = r0 -(p6) br.ret.spnt b0 ;; -} - -// Form exponent mask -// p7 if x<0, else p8 -{ .mfi -(p0) mov r17 = 0x1ffff -(p0) fcmp.lt.unc p7,p8 = f8,f0 - nop.i 999 ;; -} - -// Test for fnorm(x) denormal, means x double-extended denormal -{ .mfi - nop.m 999 -(p0) fclass.m.unc 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 -{ .mfi -(p9) add r15 = 64, r15 -(p9) fmpy f9 = f9, f12 - nop.i 999 ;; -} - -// 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 -(p0) 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 -(p0) and r18 = r17,r16 ;; -(p0) sub r19 = r18,r15 - nop.i 999 ;; -} - -// Store int y as a 32-bit integer -// Make the value a double -{ .mfb -(p0) st4 [r33] = r19 -(p0) fnorm.d f8 = f8 -(p0) br.ret.sptk b0 ;; -} - -.endp __libm_frexp_4 -ASM_SIZE_DIRECTIVE(__libm_frexp_4) -strong_alias(__libm_frexp_4, _GI___libm_frexp_4) |