225 lines
6.1 KiB
ArmAsm
225 lines
6.1 KiB
ArmAsm
.file "nearbyintf.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
|
|
//==============================================================
|
|
// 10/19/00 Created
|
|
// 02/08/01 Corrected behavior for all rounding modes.
|
|
// 05/20/02 Cleaned up namespace and sf0 syntax
|
|
// 02/10/03 Reordered header: .section, .global, .proc, .align
|
|
//==============================================================
|
|
//
|
|
// API
|
|
//==============================================================
|
|
// float nearbyintf(float x)
|
|
//
|
|
// general registers used:
|
|
//
|
|
|
|
nearbyint_GR_signexp = r14
|
|
nearbyint_GR_exponent = r15
|
|
nearbyint_GR_17ones = r16
|
|
nearbyint_GR_10033 = r17
|
|
nearbyint_GR_fpsr = r18
|
|
nearbyint_GR_rcs0 = r19
|
|
nearbyint_GR_rcs0_mask = r20
|
|
|
|
|
|
// predicate registers used:
|
|
// p6-11
|
|
|
|
// floating-point registers used:
|
|
|
|
NEARBYINT_NORM_f8 = f9
|
|
NEARBYINT_FLOAT_INT_f8 = f10
|
|
NEARBYINT_INT_f8 = f11
|
|
|
|
// Overview of operation
|
|
//==============================================================
|
|
|
|
// float nearbyintf(float x)
|
|
// Return an integer value (represented as a float) that is x rounded to integer in current
|
|
// rounding mode
|
|
// *******************************************************************************
|
|
|
|
// 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 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.
|
|
|
|
// If x is NAN, ZERO, or INFINITY, then return
|
|
|
|
// qnan snan inf norm unorm 0 -+
|
|
// 1 1 1 0 0 1 11 0xe7
|
|
|
|
|
|
.section .text
|
|
GLOBAL_LIBM_ENTRY(nearbyintf)
|
|
|
|
{ .mfi
|
|
mov nearbyint_GR_fpsr = ar40 // Read the fpsr--need to check rc.s0
|
|
fcvt.fx.s1 NEARBYINT_INT_f8 = f8
|
|
addl nearbyint_GR_10033 = 0x10016, r0
|
|
}
|
|
{ .mfi
|
|
nop.m 999
|
|
fnorm.s1 NEARBYINT_NORM_f8 = f8
|
|
mov nearbyint_GR_17ones = 0x1FFFF
|
|
;;
|
|
}
|
|
|
|
{ .mfi
|
|
nop.m 999
|
|
fclass.m.unc p6,p0 = f8, 0xe7
|
|
mov nearbyint_GR_rcs0_mask = 0x0c00
|
|
;;
|
|
}
|
|
|
|
{ .mfb
|
|
nop.m 999
|
|
(p6) fnorm.s.s0 f8 = f8
|
|
(p6) br.ret.spnt b0 // Exit if x nan, inf, zero
|
|
;;
|
|
}
|
|
|
|
{ .mfi
|
|
nop.m 999
|
|
fcvt.xf NEARBYINT_FLOAT_INT_f8 = NEARBYINT_INT_f8
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
{ .mfi
|
|
getf.exp nearbyint_GR_signexp = NEARBYINT_NORM_f8
|
|
fcmp.eq.s0 p8,p0 = f8,f0 // Dummy op to set denormal
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
|
|
{ .mii
|
|
nop.m 999
|
|
nop.i 999
|
|
and nearbyint_GR_exponent = nearbyint_GR_signexp, nearbyint_GR_17ones
|
|
;;
|
|
}
|
|
|
|
{ .mmi
|
|
cmp.ge.unc p7,p6 = nearbyint_GR_exponent, nearbyint_GR_10033
|
|
and nearbyint_GR_rcs0 = nearbyint_GR_rcs0_mask, nearbyint_GR_fpsr
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
// Check to see if s0 rounding mode is round to nearest. If not then set s2
|
|
// rounding mode to that of s0 and repeat conversions.
|
|
NEARBYINT_COMMON:
|
|
{ .mfb
|
|
cmp.ne p11,p0 = nearbyint_GR_rcs0, r0
|
|
(p6) fclass.m.unc p9,p10 = NEARBYINT_FLOAT_INT_f8, 0x07 // Test for result=0
|
|
(p11) br.cond.spnt NEARBYINT_NOT_ROUND_NEAREST // Branch if not round to nearest
|
|
;;
|
|
}
|
|
|
|
{ .mfi
|
|
nop.m 999
|
|
(p7) fnorm.s.s0 f8 = f8
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
// If result is zero, merge sign of input
|
|
{ .mfi
|
|
nop.m 999
|
|
(p9) fmerge.s f8 = f8, NEARBYINT_FLOAT_INT_f8
|
|
nop.i 999
|
|
}
|
|
{ .mfb
|
|
nop.m 999
|
|
(p10) fnorm.s.s0 f8 = NEARBYINT_FLOAT_INT_f8
|
|
br.ret.sptk b0
|
|
;;
|
|
}
|
|
|
|
|
|
NEARBYINT_NOT_ROUND_NEAREST:
|
|
// Set rounding mode of s2 to that of s0
|
|
{ .mfi
|
|
mov nearbyint_GR_rcs0 = r0 // Clear so we don't come back here
|
|
fsetc.s2 0x7f, 0x40
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
{ .mfi
|
|
nop.m 999
|
|
fcvt.fx.s2 NEARBYINT_INT_f8 = f8
|
|
nop.i 999
|
|
;;
|
|
}
|
|
|
|
{ .mfb
|
|
nop.m 999
|
|
fcvt.xf NEARBYINT_FLOAT_INT_f8 = NEARBYINT_INT_f8
|
|
br.cond.sptk NEARBYINT_COMMON
|
|
;;
|
|
}
|
|
|
|
|
|
GLOBAL_LIBM_END(nearbyintf)
|