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67236aeb6e
This patch contains the miscellaneous math routines and headers we have
implemented for RISC-V. This includes things from <math.h> that aren't
completely ISA-generic, floating-point bit manipulation, and soft-fp
hooks.
2018-01-29 Palmer Dabbelt <palmer@sifive.com>
* sysdeps/riscv/bits/fenv.h: New file.
* sysdeps/riscv/e_sqrtl.c: Likewise.
* sysdeps/riscv/fpu_control.h: Likewise.
* sysdeps/riscv/math-tests.h: Likewise.
* sysdeps/riscv/nofpu/Implies: Likewise.
* sysdeps/riscv/sfp-machine.h: Likewise.
* sysdeps/riscv/tininess.h: Likewise.
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* RISC-V softfloat definitions
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <fpu_control.h>
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#if __riscv_xlen == 32
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# error "rv32i-based targets are not supported"
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#else
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# define _FP_W_TYPE_SIZE 64
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# define _FP_W_TYPE unsigned long long
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# define _FP_WS_TYPE signed long long
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# define _FP_I_TYPE long long
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# define _FP_MUL_MEAT_S(R, X, Y) \
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_FP_MUL_MEAT_1_imm (_FP_WFRACBITS_S, R, X, Y)
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# define _FP_MUL_MEAT_D(R, X, Y) \
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_FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
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# define _FP_MUL_MEAT_Q(R, X, Y) \
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_FP_MUL_MEAT_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
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# define _FP_MUL_MEAT_DW_S(R, X, Y) \
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_FP_MUL_MEAT_DW_1_imm (_FP_WFRACBITS_S, R, X, Y)
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# define _FP_MUL_MEAT_DW_D(R, X, Y) \
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_FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
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# define _FP_MUL_MEAT_DW_Q(R, X, Y) \
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_FP_MUL_MEAT_DW_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
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# define _FP_DIV_MEAT_S(R, X, Y) _FP_DIV_MEAT_1_imm (S, R, X, Y, _FP_DIV_HELP_imm)
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# define _FP_DIV_MEAT_D(R, X, Y) _FP_DIV_MEAT_1_udiv_norm (D, R, X, Y)
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# define _FP_DIV_MEAT_Q(R, X, Y) _FP_DIV_MEAT_2_udiv (Q, R, X, Y)
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# define _FP_NANFRAC_S _FP_QNANBIT_S
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# define _FP_NANFRAC_D _FP_QNANBIT_D
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# define _FP_NANFRAC_Q _FP_QNANBIT_Q, 0
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#endif
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#define _FP_NANSIGN_S 0
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#define _FP_NANSIGN_D 0
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#define _FP_NANSIGN_Q 0
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#define _FP_KEEPNANFRACP 0
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#define _FP_QNANNEGATEDP 0
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#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
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do { \
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R##_s = _FP_NANSIGN_##fs; \
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_FP_FRAC_SET_##wc (R, _FP_NANFRAC_##fs); \
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R##_c = FP_CLS_NAN; \
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} while (0)
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#define _FP_DECL_EX int _frm __attribute__ ((unused));
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#define FP_ROUNDMODE _frm
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#define FP_RND_NEAREST FE_TONEAREST
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#define FP_RND_ZERO FE_TOWARDZERO
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#define FP_RND_PINF FE_UPWARD
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#define FP_RND_MINF FE_DOWNWARD
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#define FP_EX_INVALID FE_INVALID
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#define FP_EX_OVERFLOW FE_OVERFLOW
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#define FP_EX_UNDERFLOW FE_UNDERFLOW
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#define FP_EX_DIVZERO FE_DIVBYZERO
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#define FP_EX_INEXACT FE_INEXACT
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#define _FP_TININESS_AFTER_ROUNDING 1
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#ifdef __riscv_flen
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# define FP_INIT_ROUNDMODE \
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do { \
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__asm__ volatile ("frrm %0" : "=r" (_frm)); \
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} while (0)
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# define FP_HANDLE_EXCEPTIONS \
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do { \
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if (__builtin_expect (_fex, 0)) \
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__asm__ volatile ("csrs fflags, %0" : : "rK" (_fex)); \
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} while (0)
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#else
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# define FP_INIT_ROUNDMODE _frm = FP_RND_NEAREST
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#endif
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