/* Copy a sign bit between floating-point values. Copyright (C) 1997-2017 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, see . */ /* This has been coded in assembler because GCC makes such a mess of it when it's coded in C. */ #include #include #include #include ENTRY(__copysign) /* double [f1] copysign (double [f1] x, double [f2] y); copysign(x,y) returns a value with the magnitude of x and with the sign bit of y. */ stwu r1,-16(r1) cfi_adjust_cfa_offset (16) stfd fp2,8(r1) lwz r3,8+HIWORD(r1) cmpwi r3,0 addi r1,r1,16 cfi_adjust_cfa_offset (-16) blt L(0) fabs fp1,fp1 blr L(0): fnabs fp1,fp1 blr END (__copysign) libm_alias_double (__copysign, copysign) /* It turns out that it's safe to use this code even for single-precision. */ strong_alias(__copysign,__copysignf) libm_alias_float (__copysign, copysign) #if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) compat_symbol (libc, __copysign, copysignl, GLIBC_2_0) #endif