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authorjoseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d>2012-02-08 16:44:31 +0000
committerjoseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d>2012-02-08 16:44:31 +0000
commit78be84cd747c2e3965bf6c2fd5f702d6ff2f5525 (patch)
treec070a60ef7c5371bef8b7a559442a6920b394c8e /libc/sysdeps/ia64/fpu/s_nearbyint.S
parentde06548e980675e65a1e6d850bb8c3a3f7ec638d (diff)
downloadeglibc2-78be84cd747c2e3965bf6c2fd5f702d6ff2f5525.tar.gz
Merge changes between r16568 and r17050 from /fsf/trunk.
git-svn-id: svn://svn.eglibc.org/trunk@17051 7b3dc134-2b1b-0410-93df-9e9f96275f8d
Diffstat (limited to 'libc/sysdeps/ia64/fpu/s_nearbyint.S')
-rw-r--r--libc/sysdeps/ia64/fpu/s_nearbyint.S217
1 files changed, 0 insertions, 217 deletions
diff --git a/libc/sysdeps/ia64/fpu/s_nearbyint.S b/libc/sysdeps/ia64/fpu/s_nearbyint.S
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-.file "nearbyint.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
-//==============================================================
-// 10/19/00 Created
-// 02/08/01 Corrected behavior for all rounding modes.
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 02/10/03 Reordered header: .section, .global, .proc, .align
-// 07/25/03 Improved performance
-//==============================================================
-
-// API
-//==============================================================
-// double nearbyint(double x)
-//==============================================================
-
-// general input registers:
-// r14 - r21
-
-rSignexp = r14
-rExp = r15
-rExpMask = r16
-rBigexp = r17
-rFpsr = r19
-rRcs0 = r20
-rRcs0Mask = r21
-
-// floating-point registers:
-// f8 - f10
-
-fXInt = f9
-fNormX = f10
-
-// predicate registers used:
-// p6 - p10
-
-// Overview of operation
-//==============================================================
-// double nearbyint(double x)
-// Return an integer value (represented as a double) that is x
-// rounded to integer in current rounding mode
-// Inexact is not set, otherwise result identical with rint.
-//==============================================================
-
-// double_extended
-// if the exponent is > 1003e => 3F(true) = 63(decimal)
-// we have a significand of 64 bits 1.63-bits.
-// If we multiply by 2^63, we no longer have a fractional part
-// So input is an integer value already.
-
-// double
-// if the exponent is >= 10033 => 34(true) = 52(decimal)
-// 34 + 3ff = 433
-// we have a significand of 53 bits 1.52-bits. (implicit 1)
-// If we multiply by 2^52, we no longer have a fractional part
-// So input is an integer value already.
-
-// single
-// if the exponent is > 10016 => 17(true) = 23(decimal)
-// we have a significand of 24 bits 1.23-bits. (implicit 1)
-// If we multiply by 2^23, we no longer have a fractional part
-// So input is an integer value already.
-
-.section .text
-GLOBAL_LIBM_ENTRY(nearbyint)
-
-{ .mfi
- getf.exp rSignexp = f8 // Get signexp, recompute if unorm
- fclass.m p7,p0 = f8, 0x0b // Test x unorm
- addl rBigexp = 0x10033, r0 // Set exponent at which is integer
-}
-{ .mfi
- nop.m 0
- fcvt.fx.s1 fXInt = f8 // Convert to int in significand
- mov rExpMask = 0x1FFFF // Form exponent mask
-}
-;;
-
-{ .mfi
- mov rFpsr = ar40 // Read fpsr -- check rc.s0
- fclass.m p6,p0 = f8, 0x1e3 // Test x natval, nan, inf
- nop.i 0
-}
-{ .mfb
- nop.m 0
- fnorm.s1 fNormX = f8 // Normalize input
-(p7) br.cond.spnt RINT_UNORM // Branch if x unorm
-}
-;;
-
-
-RINT_COMMON:
-// Return here from RINT_UNORM
-{ .mfb
- and rExp = rSignexp, rExpMask // Get biased exponent
-(p6) fma.d.s0 f8 = f8, f1, f0 // Result if x natval, nan, inf
-(p6) br.ret.spnt b0 // Exit if x natval, nan, inf
-}
-;;
-
-{ .mfi
- mov rRcs0Mask = 0x0c00 // Mask for rc.s0
- fcvt.xf f8 = fXInt // Result assume |x| < 2^52
- cmp.ge p7,p8 = rExp, rBigexp // Is |x| >= 2^52?
-}
-;;
-
-// We must correct result if |x| >= 2^52
-{ .mfi
- nop.m 0
-(p7) fma.d.s0 f8 = fNormX, f1, f0 // If |x| >= 2^52, result x
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
-(p8) fmerge.s f8 = fNormX, f8 // Make sign nearbyint(x) = sign x
- nop.i 0
-}
-;;
-
-{ .mfi
-(p8) and rRcs0 = rFpsr, rRcs0Mask // Get rounding mode for sf0
- nop.f 0
- nop.i 0
-}
-;;
-
-// If |x| < 2^52 we must test for other rounding modes
-{ .mbb
-(p8) cmp.ne.unc p10,p0 = rRcs0, r0 // Test for other rounding modes
-(p10) br.cond.spnt RINT_NOT_ROUND_NEAREST // Branch if not round nearest
- br.ret.sptk b0 // Exit main path if round nearest
-}
-;;
-
-
-RINT_UNORM:
-// Here if x unorm
-{ .mfb
- getf.exp rSignexp = fNormX // Get signexp, recompute if unorm
- fcmp.eq.s0 p7,p0 = f8, f0 // Dummy op to set denormal flag
- br.cond.sptk RINT_COMMON // Return to main path
-}
-;;
-
-RINT_NOT_ROUND_NEAREST:
-// Here if not round to nearest, and |x| < 2^52
-// Set rounding mode of s2 to that of s0, and repeat the conversion using s2
-{ .mfi
- nop.m 0
- fsetc.s2 0x7f, 0x40
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
- fcvt.fx.s2 fXInt = fNormX // Convert to int in significand
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
- fcvt.xf f8 = fXInt // Expected result
- nop.i 0
-}
-;;
-
-// Be sure sign of result = sign of input. Fixes cases where result is 0.
-{ .mfb
- nop.m 0
- fmerge.s f8 = fNormX, f8
- br.ret.sptk b0 // Exit main path
-}
-;;
-
-GLOBAL_LIBM_END(nearbyint)