diff options
Diffstat (limited to 'libc/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S')
| -rw-r--r-- | libc/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/libc/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S b/libc/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S new file mode 100644 index 000000000..0102aa331 --- /dev/null +++ b/libc/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S @@ -0,0 +1,80 @@ +/* Round to int floating-point values. PowerPC32 version. + Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 + + 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., 1 Franklin Street, Fifth Floor, Boston MA + 02110-1301 USA. */ + +/* This has been coded in assembler because GCC makes such a mess of it + when it's coded in C. */ + +#include <sysdep.h> +#include <math_ldbl_opt.h> + + +/* double [fp1] nearbyint(double [fp1] x) */ + + .section .rodata.cst4,"aM",@progbits,4 + .align 2 +.LC0: /* 2**52 */ + .long 0x59800000 /* TWO52: 2**52 */ + + .section ".text" +ENTRY (__nearbyint) +#ifdef SHARED + mflr r11 + cfi_register(lr,r11) + bcl 20,31,1f +1: mflr r9 + addis r9,r9,.LC0-1b@ha + lfs fp13,.LC0-1b@l(r9) + mtlr r11 + cfi_same_value (lr) +#else + lis r9,.LC0@ha + lfs fp13,.LC0@l(r9) +#endif + fabs fp0,fp1 + fsub fp12,fp13,fp13 /* generate 0.0 */ + fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */ + bgelr cr7 + fcmpu cr7,fp1,fp12 /* if (x > 0.0 */ + ble cr7,L(lessthanzero) + mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ + fadd fp0,fp1,fp13 /* x += TWO52 */ + fsub fp1,fp0,fp13 /* x -= TWO52 */ + fabs fp1,fp1 /* if (x == 0.0 */ + mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ + blr +L(lessthanzero): + bgelr cr7 + mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ + fsub fp0,fp13,fp1 /* x -= TWO52 */ + fsub fp0,fp0,fp13 /* x += TWO52 */ + fneg fp1,fp0 /* if (x == 0.0) */ + mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ + blr +END (__nearbyint) + +weak_alias (__nearbyint, nearbyint) + +#ifdef NO_LONG_DOUBLE +weak_alias (__nearbyint, nearbyintl) +strong_alias (__nearbyint, __nearbyintl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0) +compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_0) +#endif |