2011-12-17 19:59:47 +00:00
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/* Round to int floating-point values. PowerPC32 version.
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Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2011-12-17 19:59:47 +00:00
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/* This has been coded in assembler because GCC makes such a mess of it
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when it's coded in C. */
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#include <sysdep.h>
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#include <math_ldbl_opt.h>
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/* double [fp1] nearbyint(double [fp1] x) */
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.section .rodata.cst4,"aM",@progbits,4
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.align 2
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.LC0: /* 2**52 */
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.long 0x59800000 /* TWO52: 2**52 */
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.section ".text"
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ENTRY (__nearbyint)
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#ifdef SHARED
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mflr r11
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cfi_register(lr,r11)
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bcl 20,31,1f
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1: mflr r9
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addis r9,r9,.LC0-1b@ha
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lfs fp13,.LC0-1b@l(r9)
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mtlr r11
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cfi_same_value (lr)
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#else
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lis r9,.LC0@ha
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lfs fp13,.LC0@l(r9)
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#endif
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fabs fp0,fp1
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fsub fp12,fp13,fp13 /* generate 0.0 */
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fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */
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bgelr cr7
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fcmpu cr7,fp1,fp12 /* if (x > 0.0 */
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ble cr7,L(lessthanzero)
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mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
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fadd fp0,fp1,fp13 /* x += TWO52 */
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fsub fp1,fp0,fp13 /* x -= TWO52 */
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fabs fp1,fp1 /* if (x == 0.0 */
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mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */
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blr
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L(lessthanzero):
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bgelr cr7
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mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
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fsub fp0,fp13,fp1 /* x -= TWO52 */
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fsub fp0,fp0,fp13 /* x += TWO52 */
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fneg fp1,fp0 /* if (x == 0.0) */
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mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */
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blr
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END (__nearbyint)
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weak_alias (__nearbyint, nearbyint)
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#ifdef NO_LONG_DOUBLE
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weak_alias (__nearbyint, nearbyintl)
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strong_alias (__nearbyint, __nearbyintl)
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#endif
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#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
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compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_0)
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#endif
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