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/* Round long double to long int.
IBM extended format long double version.
Copyright (C) 2004,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
.section ".toc","aw"
.LC0: /* 2**52 */
.tc FD_43300000_0[TC],0x4330000000000000
.LC1: /* 2**63 */
.tc FD_43E00000_0[TC],0x43e0000000000000
.section ".text"
/* long long int[r3] __llrintl (long double x[fp1,fp2]) */
ENTRY (__llrintl)
lfd fp13,.LC0@toc(2)
lfd fp10,.LC1@toc(2)
fabs fp0,fp1
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
fcmpu cr6,fp0,fp10 /* if (fabs(x) > TWO63) */
beq- cr6,.L2
fctid fp11,fp1 /* must delay this opperation to here */
fctid fp12,fp2 /* and avoid setting "invalid operation". */
li r0,0
stfd fp11,-16(r1)
bgt- cr6,.L9 /* if > TWO63 return "invalid operation". */
ble+ cr7,.L9 /* If < TWO52 only thy high double is used. */
stfd fp12,-8(r1)
nop /* Insure the following load is in a different dispatch group */
nop /* to avoid pipe stall on POWER4&5. */
nop
.L8:
ld r0,-8(r1)
.L9:
ld r3,-16(r1)
add r3,r3,r0
blr
/* The high double is >= TWO63 so it looks like we are "out of range".
But this may be caused by rounding of the high double and the
negative low double may bring it back into range. So we need to
de-round the high double and invert the low double without changing
the effective long double value. To do this we compute a special
value (tau) that we can subtract from the high double and add to
the low double before conversion. The resulting integers can be
summed to get the total value.
tau = floor(x_high/TWO52);
x0 = x_high - tau;
x1 = x_low + tau; */
.L2:
fdiv fp8,fp1,fp13 /* x_high/TWO52 */
fctidz fp0,fp8
fcfid fp8,fp0 /* tau = floor(x_high/TWO52); */
fsub fp3,fp1,fp8 /* x0 = x_high - tau; */
fadd fp4,fp2,fp8 /* x1 = x_low + tau; */
fctid fp11,fp3
fctid fp12,fp4
stfd fp11,-16(r1)
stfd fp12,-8(r1)
nop /* Insure the following load is in a different dispatch group */
nop /* to avoid pipe stall on POWER4&5. */
nop
ld r3,-16(r1)
ld r0,-8(r1)
addo. r3,r3,r0
bnslr+ cr0 /* if the sum does not overflow, return. */
fctid fp11,fp1 /* Otherwise we want to set "invalid operation". */
li r0,0
stfd fp11,-16(r1)
b .L9
END (__llrintl)
strong_alias (__llrintl, __lrintl)
long_double_symbol (libm, __llrintl, llrintl)
long_double_symbol (libm, __lrintl, lrintl)
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