?? s_rint.s
字號:
/* Round to int floating-point values. PowerPC32 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., 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> .section .rodata.cst4,"aM",@progbits,4 .align 2.LC0: /* 2**52 */ .long 0x59800000 .section ".text"ENTRY (__rint)#ifdef SHARED mflr r11 cfi_register(lr,r11)# ifdef HAVE_ASM_PPC_REL16 bcl 20,31,1f1: mflr r9 addis r9,r9,.LC0-1b@ha lfs fp13,.LC0-1b@l(r9)# else bl _GLOBAL_OFFSET_TABLE_@local-4 mflr r10 lwz r9,.LC0@got(10) lfs fp13,0(r9)# endif 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) */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 bng- cr6,.L4 fadd fp1,fp1,fp13 /* x+= TWO52; */ fsub fp1,fp1,fp13 /* x-= TWO52; */ fabs fp1,fp1 /* if (x == 0.0) */ blr /* x = 0.0; */.L4: bnllr- cr6 /* if (x < 0.0) */ fsub fp1,fp1,fp13 /* x-= TWO52; */ fadd fp1,fp1,fp13 /* x+= TWO52; */ fnabs fp1,fp1 /* if (x == 0.0) */ blr /* x = -0.0; */ END (__rint)weak_alias (__rint, rint)#ifdef NO_LONG_DOUBLEweak_alias (__rint, rintl)strong_alias (__rint, __rintl)#endif#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)compat_symbol (libm, __rint, rintl, GLIBC_2_0)#endif
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