bionic/libm/include/arm64/machine/fenv.h

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/*-
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/lib/msun/arm/fenv.h,v 1.5 2005/03/16 19:03:45 das Exp $
*/
/*
* In ARMv8, AArch64 state, floating-point operation is controlled by:
*
* * FPCR - 32Bit Floating-Point Control Register:
* * [31:27] - Reserved, Res0;
* * [26] - AHP, Alternative half-precision control bit;
* * [25] - DN, Default NaN mode control bit;
* * [24] - FZ, Flush-to-zero mode control bit;
* * [23:22] - RMode, Rounding Mode control field:
* * 00 - Round to Nearest (RN) mode;
* * 01 - Round towards Plus Infinity (RP) mode;
* * 10 - Round towards Minus Infinity (RM) mode;
* * 11 - Round towards Zero (RZ) mode.
* * [21:20] - Stride, ignored during AArch64 execution;
* * [19] - Reserved, Res0;
* * [18:16] - Len, ignored during AArch64 execution;
* * [15] - IDE, Input Denormal exception trap;
* * [14:13] - Reserved, Res0;
* * [12] - IXE, Inexact exception trap;
* * [11] - UFE, Underflow exception trap;
* * [10] - OFE, Overflow exception trap;
* * [9] - DZE, Division by Zero exception;
* * [8] - IOE, Invalid Operation exception;
* * [7:0] - Reserved, Res0.
*
* * FPSR - 32Bit Floating-Point Status Register:
* * [31] - N, Negative condition flag for AArch32 (AArch64 sets PSTATE.N);
* * [30] - Z, Zero condition flag for AArch32 (AArch64 sets PSTATE.Z);
* * [29] - C, Carry conditon flag for AArch32 (AArch64 sets PSTATE.C);
* * [28] - V, Overflow conditon flag for AArch32 (AArch64 sets PSTATE.V);
* * [27] - QC, Cumulative saturation bit, Advanced SIMD only;
* * [26:8] - Reserved, Res0;
* * [7] - IDC, Input Denormal cumulative exception;
* * [6:5] - Reserved, Res0;
* * [4] - IXC, Inexact cumulative exception;
* * [3] - UFC, Underflow cumulative exception;
* * [2] - OFC, Overflow cumulative exception;
* * [1] - DZC, Division by Zero cumulative exception;
* * [0] - IOC, Invalid Operation cumulative exception.
*/
#ifndef _ARM64_FENV_H_
#define _ARM64_FENV_H_
#include <sys/types.h>
__BEGIN_DECLS
typedef struct {
__uint32_t __control; /* FPCR, Floating-point Control Register */
__uint32_t __status; /* FPSR, Floating-point Status Register */
} fenv_t;
typedef __uint32_t fexcept_t;
/* Exception flags. */
#define FE_INVALID 0x01
#define FE_DIVBYZERO 0x02
#define FE_OVERFLOW 0x04
#define FE_UNDERFLOW 0x08
#define FE_INEXACT 0x10
#define FE_DENORMAL 0x80
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
FE_OVERFLOW | FE_UNDERFLOW | FE_DENORMAL)
/* Rounding modes. */
#define FE_TONEAREST 0x0
#define FE_UPWARD 0x1
#define FE_DOWNWARD 0x2
#define FE_TOWARDZERO 0x3
__END_DECLS
#endif /* !_ARM64_FENV_H_ */