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Diffstat (limited to 'sysdeps/ia64/fpu/s_round.S')
| -rw-r--r-- | sysdeps/ia64/fpu/s_round.S | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/sysdeps/ia64/fpu/s_round.S b/sysdeps/ia64/fpu/s_round.S deleted file mode 100644 index ed5ffae205..0000000000 --- a/sysdeps/ia64/fpu/s_round.S +++ /dev/null @@ -1,233 +0,0 @@ -.file "round.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 -//============================================================== -// 10/25/00 Initial version -// 06/14/01 Changed cmp to an equivalent form -// 05/20/02 Cleaned up namespace and sf0 syntax -// 01/20/03 Improved performance and reduced code size -// 04/18/03 Eliminate possible WAW dependency warning -// 09/03/03 Improved performance -//============================================================== - -// API -//============================================================== -// double round(double x) -//============================================================== - -// general input registers: -// r14 - r18 - -rSignexp = r14 -rExp = r15 -rExpMask = r16 -rBigexp = r17 -rExpHalf = r18 - -// floating-point registers: -// f8 - f13 - -fXtruncInt = f9 -fNormX = f10 -fHalf = f11 -fInc = f12 -fRem = f13 - -// predicate registers used: -// p6 - p10 - -// Overview of operation -//============================================================== -// double round(double x) -// Return an integer value (represented as a double) that is x -// rounded to nearest integer, halfway cases rounded away from -// zero. -// if x>0 result = trunc(x+0.5) -// if x<0 result = trunc(x-0.5) -// -//============================================================== - -// 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(round) - -{ .mfi - getf.exp rSignexp = f8 // Get signexp, recompute if unorm - fcvt.fx.trunc.s1 fXtruncInt = f8 // Convert to int in significand - addl rBigexp = 0x10033, r0 // Set exponent at which is integer -} -{ .mfi - mov rExpHalf = 0x0FFFE // Form sign and exponent of 0.5 - fnorm.s1 fNormX = f8 // Normalize input - mov rExpMask = 0x1FFFF // Form exponent mask -} -;; - -{ .mfi - setf.exp fHalf = rExpHalf // Form 0.5 - fclass.m p7,p0 = f8, 0x0b // Test x unorm - nop.i 0 -} -;; - -{ .mfb - nop.m 0 - fclass.m p6,p0 = f8, 0x1e3 // Test x natval, nan, inf -(p7) br.cond.spnt ROUND_UNORM // Branch if x unorm -} -;; - -ROUND_COMMON: -// Return here from ROUND_UNORM -{ .mfb - nop.m 0 - fcmp.lt.s1 p8,p9 = f8, f0 // Test if x < 0 -(p6) br.cond.spnt ROUND_SPECIAL // Exit if x natval, nan, inf -} -;; - -{ .mfi - nop.m 0 - fcvt.xf f8 = fXtruncInt // Pre-Result if 0.5 <= |x| < 2^52 - nop.i 0 -} -;; - -{ .mfi - and rExp = rSignexp, rExpMask // Get biased exponent - fmerge.s fInc = fNormX, f1 // Form increment if |rem| >= 0.5 - nop.i 0 -} -;; - -{ .mmi - cmp.lt p6,p0 = rExp, rExpHalf // Is |x| < 0.5? - cmp.ge p7,p0 = rExp, rBigexp // Is |x| >= 2^52? - cmp.lt p10,p0 = rExp, rExpHalf // Is |x| < 0.5? -} -;; - -// We must correct result if |x| < 0.5, or |x| >= 2^52 -.pred.rel "mutex",p6,p7 -{ .mfi - nop.m 0 -(p6) fmerge.s f8 = fNormX, f0 // If |x| < 0.5, result sgn(x)*0 - nop.i 0 -} -{ .mfb -(p7) cmp.eq p10,p0 = r0, r0 // Also turn on p10 if |x| >= 2^52 -(p7) fma.d.s0 f8 = fNormX, f1, f0 // If |x| >= 2^52, result x -(p10) br.ret.spnt b0 // Exit |x| < 0.5 or |x| >= 2^52 -} -;; - -// Here if 0.5 <= |x| < 2^52 -{ .mfi - nop.m 0 -(p9) fms.s1 fRem = fNormX, f1, f8 // Get remainder = x - trunc(x) - nop.i 0 -} -{ .mfi - nop.m 0 -(p8) fms.s1 fRem = f8, f1, fNormX // Get remainder = trunc(x) - x - nop.i 0 -} -;; - -{ .mfi - nop.m 0 - fcmp.ge.s1 p9,p0 = fRem, fHalf // Test |rem| >= 0.5 - nop.i 0 -} -;; - -// If x < 0 and remainder <= -0.5, then subtract 1 from result -// If x > 0 and remainder >= +0.5, then add 1 to result -{ .mfb - nop.m 0 -(p9) fma.d.s0 f8 = f8, f1, fInc - br.ret.sptk b0 -} -;; - - -ROUND_SPECIAL: -// Here if x natval, nan, inf -{ .mfb - nop.m 0 - fma.d.s0 f8 = f8, f1, f0 - br.ret.sptk b0 -} -;; - -ROUND_UNORM: -// Here if x unorm -{ .mfi - getf.exp rSignexp = fNormX // Get signexp, recompute if unorm - fcmp.eq.s0 p7,p0 = f8, f0 // Dummy op to set denormal flag - nop.i 0 -} -{ .mfb - nop.m 0 - fcvt.fx.trunc.s1 fXtruncInt = fNormX // Convert to int in significand - br.cond.sptk ROUND_COMMON // Return to main path -} -;; - -GLOBAL_LIBM_END(round) |