diff options
Diffstat (limited to 'libc/sysdeps/ia64/fpu/s_nearbyint.S')
| -rw-r--r-- | libc/sysdeps/ia64/fpu/s_nearbyint.S | 217 |
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 deleted file mode 100644 index ec1ff22db..000000000 --- a/libc/sysdeps/ia64/fpu/s_nearbyint.S +++ /dev/null @@ -1,217 +0,0 @@ -.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) |