mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
228 lines
6.4 KiB
ArmAsm
228 lines
6.4 KiB
ArmAsm
.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#
|