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1 | /* FPU control word definitions. PowerPC version. |
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2 | Copyright (C) 1996-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #ifndef _FPU_CONTROL_H |
20 | #define _FPU_CONTROL_H |
21 | |
22 | #if defined __SPE__ || (defined __NO_FPRS__ && !defined _SOFT_FLOAT) |
23 | # error "SPE/e500 is no longer supported" |
24 | #endif |
25 | |
26 | #ifdef _SOFT_FLOAT |
27 | |
28 | # define _FPU_RESERVED 0xffffffff |
29 | # define _FPU_DEFAULT 0x00000000 /* Default value. */ |
30 | typedef unsigned int fpu_control_t; |
31 | # define _FPU_GETCW(cw) (cw) = 0 |
32 | # define _FPU_SETCW(cw) (void) (cw) |
33 | extern fpu_control_t __fpu_control; |
34 | |
35 | #else /* PowerPC 6xx floating-point. */ |
36 | |
37 | /* rounding control */ |
38 | # define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ |
39 | # define _FPU_RC_DOWN 0x03 |
40 | # define _FPU_RC_UP 0x02 |
41 | # define _FPU_RC_ZERO 0x01 |
42 | |
43 | # define _FPU_MASK_RC (_FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO) |
44 | |
45 | # define _FPU_MASK_NI 0x04 /* non-ieee mode */ |
46 | |
47 | /* masking of interrupts */ |
48 | # define _FPU_MASK_ZM 0x10 /* zero divide */ |
49 | # define _FPU_MASK_OM 0x40 /* overflow */ |
50 | # define _FPU_MASK_UM 0x20 /* underflow */ |
51 | # define _FPU_MASK_XM 0x08 /* inexact */ |
52 | # define _FPU_MASK_IM 0x80 /* invalid operation */ |
53 | |
54 | # define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */ |
55 | |
56 | /* The fdlibm code requires no interrupts for exceptions. */ |
57 | # define _FPU_DEFAULT 0x00000000 /* Default value. */ |
58 | |
59 | /* IEEE: same as above, but (some) exceptions; |
60 | we leave the 'inexact' exception off. |
61 | */ |
62 | # define _FPU_IEEE 0x000000f0 |
63 | |
64 | /* Type of the control word. */ |
65 | typedef unsigned int fpu_control_t; |
66 | |
67 | /* Macros for accessing the hardware control word. */ |
68 | # define _FPU_GETCW(cw) \ |
69 | ({union { double __d; unsigned long long __ll; } __u; \ |
70 | __asm__ __volatile__("mffs %0" : "=f" (__u.__d)); \ |
71 | (cw) = (fpu_control_t) __u.__ll; \ |
72 | (fpu_control_t) __u.__ll; \ |
73 | }) |
74 | |
75 | # define _FPU_GET_RC_ISA300() \ |
76 | ({union { double __d; unsigned long long __ll; } __u; \ |
77 | __asm__ __volatile__( \ |
78 | ".machine push; .machine \"power9\"; mffsl %0; .machine pop" \ |
79 | : "=f" (__u.__d)); \ |
80 | (fpu_control_t) (__u.__ll & _FPU_MASK_RC); \ |
81 | }) |
82 | |
83 | # ifdef _ARCH_PWR9 |
84 | # define _FPU_GET_RC() _FPU_GET_RC_ISA300() |
85 | # elif defined __BUILTIN_CPU_SUPPORTS__ |
86 | # define _FPU_GET_RC() \ |
87 | ({fpu_control_t __rc; \ |
88 | __rc = __glibc_likely (__builtin_cpu_supports ("arch_3_00")) \ |
89 | ? _FPU_GET_RC_ISA300 () \ |
90 | : _FPU_GETCW (__rc) & _FPU_MASK_RC; \ |
91 | __rc; \ |
92 | }) |
93 | # else |
94 | # define _FPU_GET_RC() \ |
95 | ({fpu_control_t __rc = _FPU_GETCW (__rc) & _FPU_MASK_RC; \ |
96 | __rc; \ |
97 | }) |
98 | # endif |
99 | |
100 | # define _FPU_SETCW(cw) \ |
101 | { union { double __d; unsigned long long __ll; } __u; \ |
102 | register double __fr; \ |
103 | __u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \ |
104 | __u.__ll |= (cw) & 0xffffffffLL; \ |
105 | __fr = __u.__d; \ |
106 | __asm__ __volatile__("mtfsf 255,%0" : : "f" (__fr)); \ |
107 | } |
108 | |
109 | /* Default control word set at startup. */ |
110 | extern fpu_control_t __fpu_control; |
111 | |
112 | #endif /* PowerPC 6xx floating-point. */ |
113 | |
114 | #endif /* _FPU_CONTROL_H */ |
115 |
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