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/* round function. PowerPC32 version.
Copyright (C) 2004 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>
.section .rodata
.align 3
.type TWO52.0,@object
.size TWO52.0,8
TWO52.0:
.long 0x43300000
.long 0
.type POINTFIVE.0,@object
.size POINTFIVE.0,8
POINTFIVE.0:
.long 0x3fe00000
.long 0
.section .rodata.cst8,"aM",@progbits,8
.align 3
.LC0: /* 2**52 */
.long 0x43300000
.long 0
.LC1: /* 0.5 */
.long 0x3fe00000
.long 0
/* double [fp1] round (double x [fp1])
IEEE 1003.1 round function. IEEE specifies "round to the nearest
integer value, rounding halfway cases away from zero, regardless of
the current rounding mode." However PowerPC Architecture defines
"Round to Nearest" as "Choose the best approximation. In case of a
tie, choose the one that is even (least significant bit o).".
So we can't use the PowerPC "Round to Nearest" mode. Instead we set
"Round toward Zero" mode and round by adding +-0.5 before rounding
to the integer value. */
ENTRY (__round)
mffs fp11 /* Save current FPU rounding mode. */
#ifdef SHARED
mflr r11
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr r10
lwz r9,.LC0@got(10)
mtlr r11
lfd fp13,0(r9)
#else
lis r9,.LC0@ha
lfd fp13,.LC0@l(r9)
#endif
fabs fp0,fp1
fsub fp12,fp13,fp13 /* generate 0.0 */
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
bnllr- cr7
mtfsfi 7,1 /* Set rounding mode toward 0. */
#ifdef SHARED
lwz r9,.LC1@got(10)
lfd fp10,0(r9)
#else
lis r9,.LC1@ha
lfd fp10,.LC1@l(r9)
#endif
ble- cr6,.L4
fadd fp1,fp1,fp10 /* x+= 0.5; */
fadd fp1,fp1,fp13 /* x+= TWO52; */
fsub fp1,fp1,fp13 /* x-= TWO52; */
fabs fp1,fp1 /* if (x == 0.0) */
/* x = 0.0; */
mtfsf 0x01,fp11 /* restore previous rounding mode. */
blr
.L4:
fsub fp9,fp1,fp10 /* x+= 0.5; */
bge- cr6,.L9 /* if (x < 0.0) */
fsub fp1,fp9,fp13 /* x-= TWO52; */
fadd fp1,fp1,fp13 /* x+= TWO52; */
fnabs fp1,fp1 /* if (x == 0.0) */
/* x = -0.0; */
.L9:
mtfsf 0x01,fp11 /* restore previous rounding mode. */
blr
END (__round)
weak_alias (__round, round)
#ifdef NO_LONG_DOUBLE
weak_alias (__round, roundl)
strong_alias (__round, __roundl)
#endif
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