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We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
279 lines
7.8 KiB
ArmAsm
279 lines
7.8 KiB
ArmAsm
.file "modff.s"
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// Copyright (c) 2000 - 2003, Intel Corporation
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// All rights reserved.
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// * The name of Intel Corporation may not be used to endorse or promote
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// products derived from this software without specific prior written
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// permission.
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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://www.intel.com/software/products/opensource/libraries/num.htm.
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//
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// History
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//==============================================================
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// 02/02/00 Initial version
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// 04/04/00 Improved speed, corrected result for NaN input
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// 12/22/00 Fixed so inexact flag is never set, and invalid is not set for
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// qnans nor for inputs larger than 2^63.
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// 05/20/02 Cleaned up namespace and sf0 syntax
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// 02/10/03 Reordered header: .section, .global, .proc, .align
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//
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// API
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//==============================================================
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// float modff(float x, float *iptr)
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// break a floating point x number into fraction and an exponent
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//
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// input floating point f8, address in r33
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// output floating point f8 (x fraction), and *iptr (x integral part)
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//
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// OVERVIEW
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//==============================================================
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// NO FRACTIONAL PART: HUGE
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// If
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// for double-extended
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// If the true exponent is greater than or equal 63
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// 1003e ==> 1003e -ffff = 3f = 63(dec)
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// for double
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// If the true exponent is greater than or equal 52
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// 10033 -ffff = 34 = 52(dec)
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// for single
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// If the true exponent is greater than or equal 23
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// 10016 -ffff = 17 = 23(dec)
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// then
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// we are already an integer (p9 true)
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// NO INTEGER PART: SMALL
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// Is f8 exponent less than register bias (that is, is it
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// less than 1). If it is, get the right sign of
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// zero and store this in iptr.
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// CALCULATION: NOT HUGE, NOT SMALL
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// To get the integer part
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// Take the floating-point input and truncate
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// then convert this integer to fp Call it MODF_INTEGER_PART
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// Subtract MODF_INTEGER_PART from MODF_NORM_F8 to get fraction part
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// Then put fraction part in f8
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// put integer part MODF_INTEGER_PART into *iptr
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// Registers used
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//==============================================================
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// predicate registers used:
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// p6 - p13
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// 0xFFFF 0x10016
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// -----------------------+-----------------+-------------
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// SMALL | NORMAL | HUGE
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// p11 --------------->|<----- p12 ----->| <-------------- p9
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// p10 --------------------------------->|
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// p13 --------------------------------------------------->|
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//
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// floating-point registers used:
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MODF_NORM_F8 = f9
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MODF_FRACTION_PART = f10
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MODF_INTEGER_PART = f11
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MODF_INT_INTEGER_PART = f12
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// general registers used
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modf_signexp = r14
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modf_GR_no_frac = r15
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modf_GR_FFFF = r16
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modf_17_ones = r17
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modf_exp = r18
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// r33 = iptr
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.section .text
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GLOBAL_LIBM_ENTRY(modff)
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// Main path is p9, p11, p8 FALSE and p12 TRUE
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// Assume input is normalized and get signexp
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// Normalize input just in case
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// Form exponent bias
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{ .mfi
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getf.exp modf_signexp = f8
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fnorm.s0 MODF_NORM_F8 = f8
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addl modf_GR_FFFF = 0xffff, r0
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}
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// Get integer part of input
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// Form exponent mask
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{ .mfi
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nop.m 999
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fcvt.fx.trunc.s1 MODF_INT_INTEGER_PART = f8
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mov modf_17_ones = 0x1ffff ;;
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}
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// Is x nan or inf?
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// qnan snan inf norm unorm 0 -+
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// 1 1 1 0 0 0 11 = 0xe3 NAN_INF
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// Form biased exponent where input only has an integer part
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{ .mfi
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nop.m 999
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fclass.m.unc p6,p13 = f8, 0xe3
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addl modf_GR_no_frac = 0x10016, r0 ;;
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}
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// Mask to get exponent
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// Is x unnorm?
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// qnan snan inf norm unorm 0 -+
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// 0 0 0 0 1 0 11 = 0x0b UNORM
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// Set p13 to indicate calculation path, else p6 if nan or inf
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{ .mfi
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and modf_exp = modf_17_ones, modf_signexp
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fclass.m.unc p8,p0 = f8, 0x0b
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nop.i 999 ;;
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}
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// p11 <== SMALL, no integer part, fraction is everyting
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// p9 <== HUGE, no fraction part, integer is everything
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// p12 <== NORMAL, fraction part and integer part
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{ .mii
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(p13) cmp.lt.unc p11,p10 = modf_exp, modf_GR_FFFF
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nop.i 999
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nop.i 999 ;;
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}
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// Is x inf? p6 if inf, p7 if nan
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{ .mfb
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(p10) cmp.ge.unc p9,p12 = modf_exp, modf_GR_no_frac
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(p6) fclass.m.unc p6,p7 = f8, 0x23
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(p8) br.cond.spnt MODF_DENORM ;;
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}
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MODF_COMMON:
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// For HUGE set fraction to signed 0
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{ .mfi
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nop.m 999
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(p9) fmerge.s f8 = f8,f0
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nop.i 999
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}
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// For HUGE set integer part to normalized input
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{ .mfi
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nop.m 999
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(p9) fnorm.s.s0 MODF_INTEGER_PART = MODF_NORM_F8
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nop.i 999 ;;
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}
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// For SMALL set fraction to normalized input, integer part to signed 0
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{ .mfi
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nop.m 999
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(p11) fmerge.s MODF_INTEGER_PART = f8,f0
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nop.i 999
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}
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{ .mfi
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nop.m 999
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(p11) fnorm.s.s0 f8 = MODF_NORM_F8
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nop.i 999 ;;
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}
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// For NORMAL float the integer part
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{ .mfi
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nop.m 999
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(p12) fcvt.xf MODF_INTEGER_PART = MODF_INT_INTEGER_PART
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nop.i 999 ;;
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}
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// If x inf set integer part to INF, fraction to signed 0
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{ .mfi
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(p6) stfs [r33] = MODF_NORM_F8
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(p6) fmerge.s f8 = f8,f0
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nop.i 999 ;;
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}
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// If x nan set integer and fraction parts to NaN (quietized)
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{ .mfi
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(p7) stfs [r33] = MODF_NORM_F8
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(p7) fmerge.s f8 = MODF_NORM_F8, MODF_NORM_F8
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nop.i 999 ;;
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}
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{ .mmi
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(p9) stfs [r33] = MODF_INTEGER_PART
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nop.m 999
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nop.i 999 ;;
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}
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// For NORMAL compute fraction part
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{ .mfi
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(p11) stfs [r33] = MODF_INTEGER_PART
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(p12) fms.s.s0 f8 = MODF_NORM_F8,f1, MODF_INTEGER_PART
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nop.i 999 ;;
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}
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// For NORMAL test if fraction part is zero; if so append correct sign
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{ .mfi
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nop.m 999
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(p12) fcmp.eq.unc.s0 p7,p0 = MODF_NORM_F8, MODF_INTEGER_PART
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nop.i 999 ;;
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}
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{ .mfi
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(p12) stfs [r33] = MODF_INTEGER_PART
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nop.f 999
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nop.i 999 ;;
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}
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// For NORMAL if fraction part is zero append sign of input
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{ .mfb
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nop.m 999
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(p7) fmerge.s f8 = MODF_NORM_F8, f0
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br.ret.sptk b0 ;;
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}
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MODF_DENORM:
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// If x unorm get signexp from normalized input
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// If x unorm get integer part from normalized input
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{ .mfi
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getf.exp modf_signexp = MODF_NORM_F8
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fcvt.fx.trunc.s1 MODF_INT_INTEGER_PART = MODF_NORM_F8
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nop.i 999 ;;
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}
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// If x unorm mask to get exponent
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{ .mmi
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and modf_exp = modf_17_ones, modf_signexp ;;
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cmp.lt.unc p11,p10 = modf_exp, modf_GR_FFFF
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nop.i 999 ;;
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}
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{ .mfb
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(p10) cmp.ge.unc p9,p12 = modf_exp, modf_GR_no_frac
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nop.f 999
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br.cond.spnt MODF_COMMON ;;
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}
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GLOBAL_LIBM_END(modff)
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libm_alias_float_other (modf, modf)
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