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-.file "fdim.s"
-
-
-// Copyright (c) 2001 - 2003, Intel Corporation
-// All rights reserved.
-//
-// Contributed 2001 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
-//==============================================================
-// 06/08/01 Initial version
-// 08/23/01 Corrected error tag number
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 01/28/03 Improved performance
-//
-// API
-//==============================================================
-// double fdim( double x, double y );
-// input floating point f8, f9
-// output floating point f8
-//
-//
-// Overview of operation
-//==============================================================
-// fdim determines the positive difference between the arguments
-// Result = x - y if x > y
-// = +0 if x <= y
-//
-// Error support is called if x-y overflows for x > y
-//
-
-// Registers used
-//==============================================================
-// General purpose registers: r14, r32 - r39
-
-rExpBig = r14
-
-// r36-39 parameters for libm_error_support
-GR_SAVE_B0 = r33
-GR_SAVE_GP = r34
-GR_SAVE_PFS = r35
-
-GR_Parameter_X = r36
-GR_Parameter_Y = r37
-GR_Parameter_RESULT = r38
-GR_Parameter_TAG = r39
-
-// Floating-point registers: f8 - f12
-
-f_tmp_result = f10
-fBig = f11
-fNormX = f12
-
-// Predicate registers: p6 - p10
-
-
-.section .text
-GLOBAL_LIBM_ENTRY(fdim)
-
-{ .mfi
- mov rExpBig = 0x103ff // Exponent to indicate overflow
- fcmp.le.s1 p6,p7 = f8, f9 // Is x <= y?
- nop.i 0
-}
-{ .mfi
- nop.m 0
- fnorm.s1 fNormX = f8 // Save x
- nop.i 0
-}
-;;
-
-{ .mfi
- setf.exp fBig = rExpBig // Constant to test for overflow
- fcmp.eq.s0 p8,p0 = f8, f9 // Dummy op to set Denormal or Invalid
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
- fclass.m p9,p10 = f8, 0x1e3 // Test for x natval, nan, inf
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
-(p6) fmerge.s f8 = f0, f0 // Result is +0 if x <= y
- nop.i 0
-}
-{ .mfi
- nop.m 0
-(p7) fms.d.s0 f8 = f8, f1, f9 // Result is x - y if x > y
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
-(p10) fclass.m p9,p10 = f9, 0x1e3 // Test for y natval, nan, inf
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
-(p10) fcmp.ge.s1 p8,p0 = f8, fBig // Test result for overflow
- nop.i 0
-}
-;;
-
-{ .mbb
-(p9) cmp.ne p8,p0 = r0,r0 // Clear p8 if x or y natval,nan,inf
-(p8) br.cond.spnt FDIM_OVERFLOW // Branch if result overflows
- br.ret.sptk b0 // Normal return
-}
-;;
-
-
-// Here if result will overflow
-FDIM_OVERFLOW:
-{ .mfi
- alloc r32=ar.pfs,2,2,4,0
- fms.d.s0 f_tmp_result = f8,f1,f9 // Normalize result force overflow
- nop.i 0
-}
-{ .mfb
- mov GR_Parameter_TAG = 196 // Error code
- nop.f 0
- br.cond.sptk __libm_error_region // Branch to error code
-}
-;;
-
-GLOBAL_LIBM_END(fdim)
-
-
-LOCAL_LIBM_ENTRY(__libm_error_region)
-// Call error support to report possible range error
-.prologue
-
-{ .mfi
- add GR_Parameter_Y=-32,sp // Parameter 2 value
- nop.f 0
-.save ar.pfs,GR_SAVE_PFS
- mov GR_SAVE_PFS=ar.pfs // Save ar.pfs
-}
-{ .mfi
-.fframe 64
- add sp=-64,sp // Create new stack
- nop.f 0
- mov GR_SAVE_GP=gp // Save gp
-};;
-
-{ .mmi
- stfd [GR_Parameter_Y] = f9,16 // STORE Parameter 2 on stack
- add GR_Parameter_X = 16,sp // Parameter 1 address
-.save b0, GR_SAVE_B0
- mov GR_SAVE_B0=b0 // Save b0
-};;
-
-.body
-{ .mib
- stfd [GR_Parameter_X] = fNormX // STORE Parameter 1 on stack
- add GR_Parameter_RESULT = 0,GR_Parameter_Y // Parameter 3 address
- nop.b 0
-}
-{ .mib
- stfd [GR_Parameter_Y] = f_tmp_result // STORE Parameter 3 on stack
- add GR_Parameter_Y = -16,GR_Parameter_Y
- br.call.sptk b0=__libm_error_support# // Call error handling function
-};;
-
-{ .mmi
- add GR_Parameter_RESULT = 48,sp
- nop.m 0
- nop.i 0
-};;
-
-{ .mmi
- ldfd f8 = [GR_Parameter_RESULT] // Get return result off stack
-.restore sp
- add sp = 64,sp // Restore stack pointer
- mov b0 = GR_SAVE_B0 // Restore return address
-};;
-
-{ .mib
- mov gp = GR_SAVE_GP // Restore gp
- mov ar.pfs = GR_SAVE_PFS // Restore ar.pfs
- br.ret.sptk b0 // Return
-};;
-
-LOCAL_LIBM_END(__libm_error_region)
-
-
-.type __libm_error_support#,@function
-.global __libm_error_support#
-