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+.file "floor.s"
+
+// Copyright (c) 2000, 2001, Intel Corporation
+// All rights reserved.
+// 
+// Contributed 2/2/2000 by John Harrison, Ted Kubaska, Bob Norin, Shane Story,
+// and Ping Tak Peter Tang of the Computational Software Lab, Intel Corporation.
+// 
+// WARRANTY DISCLAIMER
+// 
+// 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://developer.intel.com/opensource.
+//
+.align 32
+.global floor#
+
+.section .text
+.proc  floor#
+.align 32
+
+// History
+//==============================================================
+// 2/02/00: Initial version
+// 3/22/00: Updated to improve performance 
+// 6/13/00: Improved speed, fixed setting of inexact flag
+// 6/27/00: Eliminated incorrect invalid flag setting
+// 2/07/01: Corrected sign of zero result in round to -inf mode
+
+// API
+//==============================================================
+// double floor(double x)
+
+// general input registers:  
+
+floor_GR_FFFF      = r14
+floor_GR_signexp   = r15
+floor_GR_exponent  = r16
+floor_GR_expmask   = r17
+floor_GR_bigexp    = r18
+
+
+// predicate registers used: 
+
+// p6  ==> Input is NaN, infinity, zero
+// p7  ==> Input is denormal
+// p8  ==> Input is <0
+// p9  ==> Input is >=0
+// p10 ==> Input is already an integer (bigger than largest integer)
+// p11 ==> Input is not a large integer
+// p12 ==> Input is a smaller integer
+// p13 ==> Input is not an even integer, so inexact must be set
+
+
+// floating-point registers used: 
+
+FLOOR_NORM_f8      = f9                        
+FLOOR_FFFF         = f10 
+FLOOR_INEXACT      = f11 
+FLOOR_FLOAT_INT_f8 = f12
+FLOOR_INT_f8       = f13
+FLOOR_adj          = f14
+
+// 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)
+// **************************************************************************
+
+// Set denormal flag for denormal input and
+// and take denormal fault if necessary.
+
+// Is the input an integer value already?
+
+// 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.
+
+// If x is NAN, ZERO, or INFINITY, then  return
+
+// qnan snan inf norm     unorm 0 -+
+// 1    1    1   0        0     1 11     0xe7
+
+#include "libm_support.h"
+
+floor:
+#ifdef _LIBC
+.global __floor
+__floor:
+#endif
+
+{ .mfi
+      getf.exp floor_GR_signexp  = f8
+      fcvt.fx.trunc.s1     FLOOR_INT_f8  = f8
+      addl        floor_GR_bigexp = 0x10033, r0
+}
+{ .mfi
+      addl        floor_GR_FFFF      = -1,r0
+      fcmp.lt.s1  p8,p9 = f8,f0
+      mov         floor_GR_expmask    = 0x1FFFF ;;
+}
+
+// p7 ==> denorm
+{ .mfi
+      setf.sig    FLOOR_FFFF  = floor_GR_FFFF
+      fclass.m    p7,p0 = f8, 0x0b
+      nop.i 999
+}
+{ .mfi
+      nop.m 999
+      fnorm.s1           FLOOR_NORM_f8  = f8
+      nop.i 999 ;;
+}
+
+// p6 ==> NAN, INF, ZERO
+{ .mfb
+      nop.m 999
+      fclass.m      p6,p10 = f8, 0xe7
+(p7)  br.cond.spnt  L(FLOOR_DENORM) ;;
+}
+
+L(FLOOR_COMMON):
+.pred.rel "mutex",p8,p9
+// Set adjustment to subtract from trunc(x) for result
+//   If x<0,  adjustment is -1.0
+//   If x>=0, adjustment is 0.0
+{ .mfi
+      and      floor_GR_exponent = floor_GR_signexp, floor_GR_expmask
+(p8)  fnma.s1  FLOOR_adj = f1,f1,f0
+      nop.i 999
+}
+{ .mfi
+      nop.m 999
+(p9)  fadd.s1  FLOOR_adj = f0,f0
+      nop.i 999 ;;
+}
+
+{ .mfi
+      nop.m 999
+      fcmp.eq.s0  p12,p0 = f8,f0 // Dummy op to set denormal and invalid flag
+      nop.i 999
+}
+{ .mfi
+(p10) cmp.ge.unc    p10,p11 = floor_GR_exponent, floor_GR_bigexp
+(p6)  fnorm.d f8 = f8
+      nop.i 999 ;;
+}
+
+{ .mfi
+      nop.m 999
+(p11) fcvt.xf         FLOOR_FLOAT_INT_f8   = FLOOR_INT_f8
+      nop.i 999 ;;
+}
+
+{ .mfi
+      nop.m 999
+(p10) fnorm.d f8 = FLOOR_NORM_f8
+      nop.i 999 ;;
+}
+
+
+{ .mfi
+      nop.m 999
+(p11) fadd.d   f8 = FLOOR_FLOAT_INT_f8,FLOOR_adj
+      nop.i 999 ;;
+}
+
+{ .mfi
+      nop.m 999
+(p11) fcmp.eq.unc.s1  p12,p13  = FLOOR_FLOAT_INT_f8, FLOOR_NORM_f8
+      nop.i 999 ;;
+}
+
+// Set inexact if result not equal to input
+{ .mfi
+      nop.m 999
+(p13) fmpy.s0     FLOOR_INEXACT = FLOOR_FFFF,FLOOR_FFFF
+      nop.i 999
+}
+// Set result to input if integer
+{ .mfb
+      nop.m 999
+(p12) fnorm.d f8 = FLOOR_NORM_f8
+      br.ret.sptk    b0 ;;
+}
+
+// Here if input denorm
+L(FLOOR_DENORM):
+{ .mfb
+      getf.exp floor_GR_signexp  = FLOOR_NORM_f8
+      fcvt.fx.trunc.s1     FLOOR_INT_f8  = FLOOR_NORM_f8
+      br.cond.sptk  L(FLOOR_COMMON) ;;
+}
+
+.endp floor
+ASM_SIZE_DIRECTIVE(floor)