Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | From 5d362074e5975b150a35bcfa77eab1bfa4e30de7 Mon Sep 17 00:00:00 2001 |
| 2 | From: Khem Raj <raj.khem@gmail.com> |
| 3 | Date: Sun, 16 Aug 2015 20:50:56 -0700 |
| 4 | Subject: [PATCH 2/7] Add implementation for copysignl for ppc |
| 5 | |
| 6 | Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| 7 | --- |
| 8 | Upstream-Status: Pending |
| 9 | |
| 10 | libc/sysdeps/linux/powerpc/Makefile.arch | 2 +- |
| 11 | libc/sysdeps/linux/powerpc/copysignl.c | 89 ++++++++++++++++++++++++++++++++ |
| 12 | 2 files changed, 90 insertions(+), 1 deletion(-) |
| 13 | create mode 100644 libc/sysdeps/linux/powerpc/copysignl.c |
| 14 | |
| 15 | diff --git a/libc/sysdeps/linux/powerpc/Makefile.arch b/libc/sysdeps/linux/powerpc/Makefile.arch |
| 16 | index 4fbcb11..7c09c87 100644 |
| 17 | --- a/libc/sysdeps/linux/powerpc/Makefile.arch |
| 18 | +++ b/libc/sysdeps/linux/powerpc/Makefile.arch |
| 19 | @@ -5,7 +5,7 @@ |
| 20 | # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. |
| 21 | # |
| 22 | |
| 23 | -CSRC-y := __syscall_error.c ioctl.c |
| 24 | +CSRC-y := __syscall_error.c ioctl.c copysignl.c |
| 25 | |
| 26 | SSRC-y := \ |
| 27 | __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S \ |
| 28 | diff --git a/libc/sysdeps/linux/powerpc/copysignl.c b/libc/sysdeps/linux/powerpc/copysignl.c |
| 29 | new file mode 100644 |
| 30 | index 0000000..000f653 |
| 31 | --- /dev/null |
| 32 | +++ b/libc/sysdeps/linux/powerpc/copysignl.c |
| 33 | @@ -0,0 +1,89 @@ |
| 34 | +/* s_copysignl.c -- long double version of s_copysign.c. |
| 35 | + * Conversion to long double by Ulrich Drepper, |
| 36 | + * Cygnus Support, drepper@cygnus.com. |
| 37 | + */ |
| 38 | + |
| 39 | +/* |
| 40 | + * ==================================================== |
| 41 | + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 42 | + * |
| 43 | + * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 44 | + * Permission to use, copy, modify, and distribute this |
| 45 | + * software is freely granted, provided that this notice |
| 46 | + * is preserved. |
| 47 | + * ==================================================== |
| 48 | + */ |
| 49 | + |
| 50 | +/* |
| 51 | + * copysignl(long double x, long double y) |
| 52 | + * copysignl(x,y) returns a value with the magnitude of x and |
| 53 | + * with the sign bit of y. |
| 54 | + */ |
| 55 | + |
| 56 | +#include <endian.h> |
| 57 | +#include <stdint.h> |
| 58 | + |
| 59 | +#if __FLOAT_WORD_ORDER == BIG_ENDIAN |
| 60 | + |
| 61 | +typedef union |
| 62 | +{ |
| 63 | + long double value; |
| 64 | + struct |
| 65 | + { |
| 66 | + int sign_exponent:16; |
| 67 | + unsigned int empty:16; |
| 68 | + uint32_t msw; |
| 69 | + uint32_t lsw; |
| 70 | + } parts; |
| 71 | +} ieee_long_double_shape_type; |
| 72 | + |
| 73 | +#endif |
| 74 | + |
| 75 | +#if __FLOAT_WORD_ORDER == LITTLE_ENDIAN |
| 76 | + |
| 77 | +typedef union |
| 78 | +{ |
| 79 | + long double value; |
| 80 | + struct |
| 81 | + { |
| 82 | + uint32_t lsw; |
| 83 | + uint32_t msw; |
| 84 | + int sign_exponent:16; |
| 85 | + unsigned int empty:16; |
| 86 | + } parts; |
| 87 | +} ieee_long_double_shape_type; |
| 88 | + |
| 89 | +#endif |
| 90 | + |
| 91 | +/* Get int from the exponent of a long double. */ |
| 92 | + |
| 93 | +#define GET_LDOUBLE_EXP(exp,d) \ |
| 94 | +do { \ |
| 95 | + ieee_long_double_shape_type ge_u; \ |
| 96 | + ge_u.value = (d); \ |
| 97 | + (exp) = ge_u.parts.sign_exponent; \ |
| 98 | +} while (0) |
| 99 | + |
| 100 | +/* Set exponent of a long double from an int. */ |
| 101 | + |
| 102 | +#define SET_LDOUBLE_EXP(d,exp) \ |
| 103 | +do { \ |
| 104 | + ieee_long_double_shape_type se_u; \ |
| 105 | + se_u.value = (d); \ |
| 106 | + se_u.parts.sign_exponent = (exp); \ |
| 107 | + (d) = se_u.value; \ |
| 108 | +} while (0) |
| 109 | + |
| 110 | +long double copysignl(long double x, long double y); |
| 111 | +libc_hidden_proto(copysignl); |
| 112 | + |
| 113 | +long double copysignl(long double x, long double y) |
| 114 | +{ |
| 115 | + uint32_t es1,es2; |
| 116 | + GET_LDOUBLE_EXP(es1,x); |
| 117 | + GET_LDOUBLE_EXP(es2,y); |
| 118 | + SET_LDOUBLE_EXP(x,(es1&0x7fff)|(es2&0x8000)); |
| 119 | + return x; |
| 120 | +} |
| 121 | + |
| 122 | +libc_hidden_def(copysignl); |
| 123 | -- |
| 124 | 2.1.4 |
| 125 | |