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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>
230 lines
6.9 KiB
ArmAsm
230 lines
6.9 KiB
ArmAsm
.file "rintl.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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// 02/08/01 Corrected behavior for all rounding modes.
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// 05/20/02 Cleaned up namespace and sf0 syntax
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// 01/20/03 Improved performance
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//==============================================================
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// API
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//==============================================================
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// long double rintl(long double x)
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//==============================================================
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// general input registers:
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// r14 - r21
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rSignexp = r14
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rExp = r15
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rExpMask = r16
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rBigexp = r17
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rM1 = r18
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rFpsr = r19
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rRcs0 = r20
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rRcs0Mask = r21
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// floating-point registers:
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// f8 - f11
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fXInt = f9
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fNormX = f10
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fTmp = f11
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// predicate registers used:
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// p6 - p10
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// Overview of operation
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//==============================================================
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// long double rintl(long double x)
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// Return an integer value (represented as a long double) that is x
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// rounded to integer in current rounding mode
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// Inexact is set if x != rint(x)
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//==============================================================
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// double_extended
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// if the exponent is > 1003e => 3F(true) = 63(decimal)
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// we have a significand of 64 bits 1.63-bits.
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// If we multiply by 2^63, we no longer have a fractional part
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// So input is an integer value already.
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// double
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// if the exponent is >= 10033 => 34(true) = 52(decimal)
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// 34 + 3ff = 433
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// we have a significand of 53 bits 1.52-bits. (implicit 1)
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// If we multiply by 2^52, we no longer have a fractional part
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// So input is an integer value already.
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// single
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// if the exponent is > 10016 => 17(true) = 23(decimal)
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// we have a significand of 24 bits 1.23-bits. (implicit 1)
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// If we multiply by 2^23, we no longer have a fractional part
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// So input is an integer value already.
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.section .text
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GLOBAL_IEEE754_ENTRY(rintl)
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{ .mfi
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getf.exp rSignexp = f8 // Get signexp, recompute if unorm
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fclass.m p7,p0 = f8, 0x0b // Test x unorm
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addl rBigexp = 0x1003e, r0 // Set exponent at which is integer
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}
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{ .mfi
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mov rM1 = -1 // Set all ones
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fcvt.fx.s1 fXInt = f8 // Convert to int in significand
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mov rExpMask = 0x1FFFF // Form exponent mask
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}
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;;
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{ .mfi
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mov rFpsr = ar40 // Read fpsr -- check rc.s0
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fclass.m p6,p0 = f8, 0x1e3 // Test x natval, nan, inf
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nop.i 0
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}
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{ .mfb
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setf.sig fTmp = rM1 // Make const for setting inexact
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fnorm.s1 fNormX = f8 // Normalize input
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(p7) br.cond.spnt RINT_UNORM // Branch if x unorm
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}
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;;
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RINT_COMMON:
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// Return here from RINT_UNORM
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{ .mfb
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and rExp = rSignexp, rExpMask // Get biased exponent
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(p6) fma.s0 f8 = f8, f1, f0 // Result if x natval, nan, inf
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(p6) br.ret.spnt b0 // Exit if x natval, nan, inf
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}
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;;
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{ .mfi
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mov rRcs0Mask = 0x0c00 // Mask for rc.s0
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fcvt.xf f8 = fXInt // Result assume |x| < 2^63
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cmp.ge p7,p8 = rExp, rBigexp // Is |x| >= 2^63?
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}
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;;
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// We must correct result if |x| >= 2^63
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{ .mfi
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nop.m 0
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(p7) fma.s0 f8 = fNormX, f1, f0 // If |x| >= 2^63, result x
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nop.i 0
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}
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;;
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{ .mfi
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nop.m 0
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fcmp.eq.unc.s1 p0, p9 = f8, fNormX // Is result = x ?
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nop.i 0
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}
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{ .mfi
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nop.m 0
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(p8) fmerge.s f8 = fNormX, f8 // Make sure sign rint(x) = sign x
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nop.i 0
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}
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;;
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{ .mfi
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(p8) and rRcs0 = rFpsr, rRcs0Mask // Get rounding mode for sf0
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nop.f 0
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nop.i 0
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}
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;;
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// If |x| < 2^63 we must test for other rounding modes
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{ .mfi
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(p8) cmp.ne.unc p10,p0 = rRcs0, r0 // Test for other rounding modes
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(p9) fmpy.s0 fTmp = fTmp, fTmp // Dummy to set inexact
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nop.i 0
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}
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{ .mbb
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nop.m 0
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(p10) br.cond.spnt RINT_NOT_ROUND_NEAREST // Branch if not round nearest
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br.ret.sptk b0 // Exit main path if round nearest
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}
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;;
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RINT_UNORM:
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// Here if x unorm
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{ .mfb
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getf.exp rSignexp = fNormX // Get signexp, recompute if unorm
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fcmp.eq.s0 p7,p0 = f8, f0 // Dummy op to set denormal flag
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br.cond.sptk RINT_COMMON // Return to main path
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}
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;;
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RINT_NOT_ROUND_NEAREST:
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// Here if not round to nearest, and |x| < 2^63
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// Set rounding mode of s2 to that of s0, and repeat the conversion using s2
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{ .mfi
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nop.m 0
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fsetc.s2 0x7f, 0x40
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nop.i 0
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}
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;;
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{ .mfi
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nop.m 0
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fcvt.fx.s2 fXInt = fNormX // Convert to int in significand
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nop.i 0
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}
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;;
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{ .mfi
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nop.m 0
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fcvt.xf f8 = fXInt // Expected result
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nop.i 0
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}
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;;
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// Be sure sign of result = sign of input. Fixes cases where result is 0.
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{ .mfb
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nop.m 0
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fmerge.s f8 = fNormX, f8
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br.ret.sptk b0 // Exit main path
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}
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;;
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GLOBAL_IEEE754_END(rintl)
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libm_alias_ldouble_other (__rint, rint)
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