| 1 | --- a/libc/sysdeps/linux/powerpc/Makefile.arch |
| 2 | +++ b/libc/sysdeps/linux/powerpc/Makefile.arch |
| 3 | @@ -5,7 +5,7 @@ |
| 4 | # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. |
| 5 | # |
| 6 | |
| 7 | -CSRC := __syscall_error.c pread_write.c ioctl.c |
| 8 | +CSRC := __syscall_error.c pread_write.c ioctl.c copysignl.c |
| 9 | |
| 10 | SSRC := \ |
| 11 | __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S \ |
| 12 | --- /dev/null |
| 13 | +++ b/libc/sysdeps/linux/powerpc/copysignl.c |
| 14 | @@ -0,0 +1,89 @@ |
| 15 | +/* s_copysignl.c -- long double version of s_copysign.c. |
| 16 | + * Conversion to long double by Ulrich Drepper, |
| 17 | + * Cygnus Support, drepper@cygnus.com. |
| 18 | + */ |
| 19 | + |
| 20 | +/* |
| 21 | + * ==================================================== |
| 22 | + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 23 | + * |
| 24 | + * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 25 | + * Permission to use, copy, modify, and distribute this |
| 26 | + * software is freely granted, provided that this notice |
| 27 | + * is preserved. |
| 28 | + * ==================================================== |
| 29 | + */ |
| 30 | + |
| 31 | +/* |
| 32 | + * copysignl(long double x, long double y) |
| 33 | + * copysignl(x,y) returns a value with the magnitude of x and |
| 34 | + * with the sign bit of y. |
| 35 | + */ |
| 36 | + |
| 37 | +#include <endian.h> |
| 38 | +#include <stdint.h> |
| 39 | + |
| 40 | +#if __FLOAT_WORD_ORDER == BIG_ENDIAN |
| 41 | + |
| 42 | +typedef union |
| 43 | +{ |
| 44 | + long double value; |
| 45 | + struct |
| 46 | + { |
| 47 | + int sign_exponent:16; |
| 48 | + unsigned int empty:16; |
| 49 | + uint32_t msw; |
| 50 | + uint32_t lsw; |
| 51 | + } parts; |
| 52 | +} ieee_long_double_shape_type; |
| 53 | + |
| 54 | +#endif |
| 55 | + |
| 56 | +#if __FLOAT_WORD_ORDER == LITTLE_ENDIAN |
| 57 | + |
| 58 | +typedef union |
| 59 | +{ |
| 60 | + long double value; |
| 61 | + struct |
| 62 | + { |
| 63 | + uint32_t lsw; |
| 64 | + uint32_t msw; |
| 65 | + int sign_exponent:16; |
| 66 | + unsigned int empty:16; |
| 67 | + } parts; |
| 68 | +} ieee_long_double_shape_type; |
| 69 | + |
| 70 | +#endif |
| 71 | + |
| 72 | +/* Get int from the exponent of a long double. */ |
| 73 | + |
| 74 | +#define GET_LDOUBLE_EXP(exp,d) \ |
| 75 | +do { \ |
| 76 | + ieee_long_double_shape_type ge_u; \ |
| 77 | + ge_u.value = (d); \ |
| 78 | + (exp) = ge_u.parts.sign_exponent; \ |
| 79 | +} while (0) |
| 80 | + |
| 81 | +/* Set exponent of a long double from an int. */ |
| 82 | + |
| 83 | +#define SET_LDOUBLE_EXP(d,exp) \ |
| 84 | +do { \ |
| 85 | + ieee_long_double_shape_type se_u; \ |
| 86 | + se_u.value = (d); \ |
| 87 | + se_u.parts.sign_exponent = (exp); \ |
| 88 | + (d) = se_u.value; \ |
| 89 | +} while (0) |
| 90 | + |
| 91 | +long double copysignl(long double x, long double y); |
| 92 | +libc_hidden_proto(copysignl); |
| 93 | + |
| 94 | +long double copysignl(long double x, long double y) |
| 95 | +{ |
| 96 | + uint32_t es1,es2; |
| 97 | + GET_LDOUBLE_EXP(es1,x); |
| 98 | + GET_LDOUBLE_EXP(es2,y); |
| 99 | + SET_LDOUBLE_EXP(x,(es1&0x7fff)|(es2&0x8000)); |
| 100 | + return x; |
| 101 | +} |
| 102 | + |
| 103 | +libc_hidden_def(copysignl); |
| 104 | |
