1 /* Inline math functions for powerpc.
2 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2004, 2006
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 # error "Never use <bits/mathinline.h> directly; include <math.h> instead."
28 # define __MATH_INLINE __inline
30 # define __MATH_INLINE extern __inline
31 #endif /* __cplusplus */
33 #if defined __GNUC__ && !defined _SOFT_FLOAT
36 # if !__GNUC_PREREQ (2,97)
37 # define __unordered_cmp(x, y) \
39 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
41 __asm__("fcmpu 7,%1,%2 ; mfcr %0" : "=r" (__r) : "f" (__x), "f"(__y) \
46 # undef isgreaterequal
52 # define isgreater(x, y) (__unordered_cmp (x, y) >> 2 & 1)
53 # define isgreaterequal(x, y) ((__unordered_cmp (x, y) & 6) != 0)
54 # define isless(x, y) (__unordered_cmp (x, y) >> 3 & 1)
55 # define islessequal(x, y) ((__unordered_cmp (x, y) & 0xA) != 0)
56 # define islessgreater(x, y) ((__unordered_cmp (x, y) & 0xC) != 0)
57 # define isunordered(x, y) (__unordered_cmp (x, y) & 1)
59 # endif /* __GNUC_PREREQ (2,97) */
61 /* The gcc, version 2.7 or below, has problems with all this inlining
62 code. So disable it for this version of the compiler. */
63 # if __GNUC_PREREQ (2, 8)
64 /* Test for negative number. Used in the signbit() macro. */
66 __NTH (__signbitf (float __x))
68 __extension__ union { float __f; int __i; } __u = { __f: __x };
72 __NTH (__signbit (double __x))
74 __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
75 return __u.__i[0] < 0;
78 #endif /* __USE_ISOC99 */
80 #if !defined __NO_MATH_INLINES && defined __OPTIMIZE__
84 # ifndef __powerpc64__
85 __MATH_INLINE long int lrint (double __x) __THROW;
86 __MATH_INLINE long int
87 __NTH (lrint (double __x))
93 __asm__ ("fctiw %0,%1" : "=f"(__u.__d) : "f"(__x));
97 __MATH_INLINE long int lrintf (float __x) __THROW;
98 __MATH_INLINE long int
99 __NTH (lrintf (float __x))
105 __asm__ ("fctiw %0,%1" : "=f"(__u.__d) : "f"(__x));
110 __MATH_INLINE double fdim (double __x, double __y) __THROW;
112 __NTH (fdim (double __x, double __y))
114 return __x <= __y ? 0 : __x - __y;
117 __MATH_INLINE float fdimf (float __x, float __y) __THROW;
119 __NTH (fdimf (float __x, float __y))
121 return __x <= __y ? 0 : __x - __y;
124 #endif /* __USE_ISOC99 */
125 #endif /* !__NO_MATH_INLINES && __OPTIMIZE__ */
127 /* This code is used internally in the GNU libc. */
128 #if 0 /*def __LIBC_INTERNAL_MATH_INLINES*/
131 #include <ldsodefs.h>
132 #include <dl-procinfo.h>
134 # if __WORDSIZE == 64 || defined _ARCH_PWR4
135 # define __CPU_HAS_FSQRT 1
137 # define __CPU_HAS_FSQRT ((GLRO(dl_hwcap) & PPC_FEATURE_64) != 0)
140 extern double __slow_ieee754_sqrt (double);
142 __NTH (__ieee754_sqrt (double __x))
146 /* If the CPU is 64-bit we can use the optional FP instructions. */
149 /* Volatile is required to prevent the compiler from moving the
150 fsqrt instruction above the branch. */
151 __asm__ __volatile__ (
157 __z = __slow_ieee754_sqrt(__x);
162 extern float __slow_ieee754_sqrtf (float);
164 __NTH (__ieee754_sqrtf (float __x))
168 /* If the CPU is 64-bit we can use the optional FP instructions. */
171 /* Volatile is required to prevent the compiler from moving the
172 fsqrts instruction above the branch. */
173 __asm__ __volatile__ (
179 __z = __slow_ieee754_sqrtf(__x);
183 #endif /* __LIBC_INTERNAL_MATH_INLINES */
184 #endif /* __GNUC__ && !_SOFT_FLOAT */