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| 1 | /* FPU control word definitions. PowerPC version. |
|---|---|
| 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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