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-.file "floor.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
-//==============================================================
-// 02/02/00 Initial version
-// 03/22/00 Updated to improve performance
-// 06/13/00 Improved speed, fixed setting of inexact flag
-// 06/27/00 Eliminated incorrect invalid flag setting
-// 02/07/01 Corrected sign of zero result in round to -inf mode
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 01/28/03 Improved performance
-//==============================================================
-
-// API
-//==============================================================
-// double floor(double x)
-//==============================================================
-
-// general input registers:
-// r14 - r18
-
-rSignexp   = r14
-rExp       = r15
-rExpMask   = r16
-rBigexp    = r17
-rM1        = r18
-
-// floating-point registers:
-// f8 - f13
-
-fXInt      = f9
-fNormX     = f10
-fTmp       = f11
-fAdj       = f12
-fPreResult = f13
-
-// predicate registers used:
-// p6 - p9
-
-// Overview of operation
-//==============================================================
-// double floor(double x)
-// Return an integer value (represented as a double) that is the largest
-// value not greater than x
-// This is x rounded toward -infinity to an integral value.
-// Inexact is set if x != floor(x)
-//==============================================================
-
-// 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_IEEE754_ENTRY(floor)
-
-{ .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
-      mov              rM1 = -1              // Set all ones
-      fcvt.fx.trunc.s1 fXInt  = f8           // Convert to int in significand
-      mov              rExpMask    = 0x1FFFF // Form exponent mask
-}
-;;
-
-{ .mfi
-      nop.m            0
-      fcmp.lt.s1       p8,p9 = f8, f0        // Test x < 0
-      nop.i            0
-}
-{ .mfb
-      setf.sig         fTmp = rM1            // Make const for setting inexact
-      fnorm.s1         fNormX  = f8          // Normalize input
-(p7)  br.cond.spnt     FLOOR_UNORM           // Branch if x unorm
-}
-;;
-
-FLOOR_COMMON:
-// Return here from FLOOR_UNORM
-{ .mfi
-      nop.m            0
-      fclass.m         p6,p0 = f8, 0x1e7     // Test x natval, nan, inf, 0
-      nop.i            0
-}
-;;
-
-.pred.rel "mutex",p8,p9
-{ .mfi
-      nop.m            0
-(p8)  fnma.s1          fAdj = f1, f1, f0     // If x < 0, adjustment is -1
-      nop.i            0
-}
-{ .mfi
-      nop.m            0
-(p9)  fma.s1           fAdj = f0, f0, f0     // If x > 0, adjustment is 0
-      nop.i            0
-}
-;;
-
-{ .mfi
-      nop.m            0
-      fcvt.xf          fPreResult = fXInt    // trunc(x)
-      nop.i            0
-}
-{ .mfb
-      nop.m            0
-(p6)  fma.d.s0         f8 = f8, f1, f0       // Result if x natval, nan, inf, 0
-(p6)  br.ret.spnt      b0                    // Exit if x natval, nan, inf, 0
-}
-;;
-
-{ .mmi
-      and              rExp = rSignexp, rExpMask // Get biased exponent
-;;
-      cmp.ge           p7,p6 = rExp, rBigexp  // Is |x| >= 2^52?
-      nop.i            0
-}
-;;
-
-{ .mfi
-      nop.m            0
-(p6)  fma.d.s0         f8 = fPreResult, f1, fAdj // Result if !int, |x| < 2^52
-      nop.i            0
-}
-{ .mfi
-      nop.m            0
-(p7)  fma.d.s0         f8 = fNormX, f1, f0    // Result, if |x| >= 2^52
-      nop.i            0
-}
-;;
-
-{ .mfi
-      nop.m            0
-(p6)  fcmp.eq.unc.s1   p8, p9 = fPreResult, fNormX // Is trunc(x) = x ?
-      nop.i            0
-}
-;;
-
-{ .mfi
-      nop.m            0
-(p9)  fmpy.s0          fTmp = fTmp, fTmp      // Dummy to set inexact
-      nop.i            0
-}
-{ .mfb
-      nop.m            0
-(p8)  fma.d.s0         f8 = fNormX, f1, f0    // If x int, result normalized x
-      br.ret.sptk      b0                     // Exit main path, 0 < |x| < 2^52
-}
-;;
-
-
-FLOOR_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     FLOOR_COMMON           // Return to main path
-}
-;;
-
-GLOBAL_IEEE754_END(floor)