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[PATCH v3 11/19] RISC-V: Generic <math.h> and soft-fp Routines


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.

FIXME: add ieee745/soft-fp via a riscv/soft-fp directory.
---
 sysdeps/riscv/bits/fenv.h   |  74 +++++++++++++++++++++++++++++
 sysdeps/riscv/fpu_control.h |  74 +++++++++++++++++++++++++++++
 sysdeps/riscv/sfp-machine.h | 112 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 260 insertions(+)
 create mode 100644 sysdeps/riscv/bits/fenv.h
 create mode 100644 sysdeps/riscv/fpu_control.h
 create mode 100644 sysdeps/riscv/sfp-machine.h

diff --git a/sysdeps/riscv/bits/fenv.h b/sysdeps/riscv/bits/fenv.h
new file mode 100644
index 000000000000..13569f6d2ca6
--- /dev/null
+++ b/sysdeps/riscv/bits/fenv.h
@@ -0,0 +1,74 @@
+/* Floating point environment, RISC-V version.
+   Copyright (C) 1998-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+enum
+  {
+    FE_INEXACT   =
+#define FE_INEXACT	(0x01)
+      FE_INEXACT,
+    FE_UNDERFLOW =
+#define FE_UNDERFLOW	(0x02)
+      FE_UNDERFLOW,
+    FE_OVERFLOW  =
+#define FE_OVERFLOW	(0x04)
+      FE_OVERFLOW,
+    FE_DIVBYZERO =
+#define FE_DIVBYZERO	(0x08)
+      FE_DIVBYZERO,
+    FE_INVALID   =
+#define FE_INVALID	(0x10)
+      FE_INVALID,
+  };
+
+#define FE_ALL_EXCEPT \
+	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+enum
+  {
+    FE_TONEAREST  =
+#define FE_TONEAREST	(0x0)
+      FE_TONEAREST,
+    FE_TOWARDZERO =
+#define FE_TOWARDZERO	(0x1)
+      FE_TOWARDZERO,
+    FE_DOWNWARD   =
+#define FE_DOWNWARD	(0x2)
+      FE_DOWNWARD,
+    FE_UPWARD     =
+#define FE_UPWARD	(0x3)
+      FE_UPWARD,
+  };
+
+
+typedef unsigned int fexcept_t;
+typedef unsigned int fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((__const fenv_t *) -1)
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Type representing floating-point control modes.  */
+typedef unsigned int femode_t;
+
+/* Default floating-point control modes.  */
+# define FE_DFL_MODE	((const femode_t *) -1L)
+#endif
diff --git a/sysdeps/riscv/fpu_control.h b/sysdeps/riscv/fpu_control.h
new file mode 100644
index 000000000000..d873766a3f54
--- /dev/null
+++ b/sysdeps/riscv/fpu_control.h
@@ -0,0 +1,74 @@
+/* FPU control word bits.  RISC-V version.
+   Copyright (C) 1996-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _FPU_CONTROL_H
+#define _FPU_CONTROL_H
+
+#include <features.h>
+
+#ifndef __riscv_flen
+
+# define _FPU_RESERVED 0xffffffff
+# define _FPU_DEFAULT  0x00000000
+typedef unsigned int fpu_control_t;
+# define _FPU_GETCW(cw) (cw) = 0
+# define _FPU_SETCW(cw) do { } while (0)
+extern fpu_control_t __fpu_control;
+
+#else /* __riscv_flen */
+
+# define _FPU_RESERVED 0
+# define _FPU_DEFAULT  0
+# define _FPU_IEEE     _FPU_DEFAULT
+
+/* Type of the control word.  */
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
+
+/* Macros for accessing the hardware control word.  */
+# define _FPU_GETCW(cw) __asm__ volatile ("frsr %0" : "=r" (cw))
+# define _FPU_SETCW(cw) __asm__ volatile ("fssr %z0" : : "rJ" (cw))
+
+/* Default control word set at startup.  */
+extern fpu_control_t __fpu_control;
+
+# define _FCLASS(x) ({ int res; \
+  if (sizeof (x) * 8 > __riscv_flen) __builtin_trap (); \
+  if (sizeof (x) == 4) asm ("fclass.s %0, %1" : "=r" (res) : "f" (x)); \
+  else if (sizeof (x) == 8) asm ("fclass.d %0, %1" : "=r" (res) : "f" (x)); \
+  else __builtin_trap (); \
+  res; })
+
+# define _FCLASS_MINF     (1 << 0)
+# define _FCLASS_MNORM    (1 << 1)
+# define _FCLASS_MSUBNORM (1 << 2)
+# define _FCLASS_MZERO    (1 << 3)
+# define _FCLASS_PZERO    (1 << 4)
+# define _FCLASS_PSUBNORM (1 << 5)
+# define _FCLASS_PNORM    (1 << 6)
+# define _FCLASS_PINF     (1 << 7)
+# define _FCLASS_SNAN     (1 << 8)
+# define _FCLASS_QNAN     (1 << 9)
+# define _FCLASS_ZERO     (_FCLASS_MZERO | _FCLASS_PZERO)
+# define _FCLASS_SUBNORM  (_FCLASS_MSUBNORM | _FCLASS_PSUBNORM)
+# define _FCLASS_NORM     (_FCLASS_MNORM | _FCLASS_PNORM)
+# define _FCLASS_INF      (_FCLASS_MINF | _FCLASS_PINF)
+# define _FCLASS_NAN      (_FCLASS_SNAN | _FCLASS_QNAN)
+
+#endif /* __riscv_flen */
+
+#endif	/* fpu_control.h */
diff --git a/sysdeps/riscv/sfp-machine.h b/sysdeps/riscv/sfp-machine.h
new file mode 100644
index 000000000000..702ecf7b33ca
--- /dev/null
+++ b/sysdeps/riscv/sfp-machine.h
@@ -0,0 +1,112 @@
+/* RISC-V softfloat definitions
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <fpu_control.h>
+
+#if __riscv_xlen == 32
+
+# define _FP_W_TYPE_SIZE		32
+# define _FP_W_TYPE		unsigned long
+# define _FP_WS_TYPE		signed long
+# define _FP_I_TYPE		long
+
+# define _FP_MUL_MEAT_S(R, X, Y)				\
+  _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+# define _FP_MUL_MEAT_D(R, X, Y)				\
+  _FP_MUL_MEAT_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+# define _FP_MUL_MEAT_Q(R, X, Y)				\
+  _FP_MUL_MEAT_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+# define _FP_DIV_MEAT_S(R, X, Y)	_FP_DIV_MEAT_1_udiv_norm (S, R, X, Y)
+# define _FP_DIV_MEAT_D(R, X, Y)	_FP_DIV_MEAT_2_udiv (D, R, X, Y)
+# define _FP_DIV_MEAT_Q(R, X, Y)	_FP_DIV_MEAT_4_udiv (Q, R, X, Y)
+
+# define _FP_NANFRAC_S		_FP_QNANBIT_S
+# define _FP_NANFRAC_D		_FP_QNANBIT_D, 0
+# define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0, 0, 0
+
+#else
+
+# define _FP_W_TYPE_SIZE		64
+# define _FP_W_TYPE		unsigned long long
+# define _FP_WS_TYPE		signed long long
+# define _FP_I_TYPE		long long
+
+# define _FP_MUL_MEAT_S(R, X, Y)					\
+  _FP_MUL_MEAT_1_imm (_FP_WFRACBITS_S, R, X, Y)
+# define _FP_MUL_MEAT_D(R, X, Y)					\
+  _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+# define _FP_MUL_MEAT_Q(R, X, Y)					\
+  _FP_MUL_MEAT_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+# define _FP_DIV_MEAT_S(R, X, Y)	_FP_DIV_MEAT_1_imm(S, R, X, Y, _FP_DIV_HELP_imm)
+# define _FP_DIV_MEAT_D(R, X, Y)	_FP_DIV_MEAT_1_udiv_norm(D, R, X, Y)
+# define _FP_DIV_MEAT_Q(R, X, Y)	_FP_DIV_MEAT_2_udiv(Q, R, X, Y)
+
+# define _FP_NANFRAC_S		_FP_QNANBIT_S
+# define _FP_NANFRAC_D		_FP_QNANBIT_D
+# define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0
+
+#endif
+
+#define _FP_NANSIGN_S		0
+#define _FP_NANSIGN_D		0
+#define _FP_NANSIGN_Q		0
+
+#define _FP_KEEPNANFRACP 0
+#define _FP_QNANNEGATEDP 0
+
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)	\
+  do {						\
+    R##_s = _FP_NANSIGN_##fs;			\
+    _FP_FRAC_SET_##wc (R, _FP_NANFRAC_##fs);	\
+    R##_c = FP_CLS_NAN;				\
+  } while (0)
+
+#define _FP_DECL_EX		int _frm __attribute__ ((unused));
+#define FP_ROUNDMODE		_frm
+
+#define FP_RND_NEAREST		FE_TONEAREST
+#define FP_RND_ZERO		FE_TOWARDZERO
+#define FP_RND_PINF		FE_UPWARD
+#define FP_RND_MINF		FE_DOWNWARD
+
+#define FP_EX_INVALID		FE_INVALID
+#define FP_EX_OVERFLOW		FE_OVERFLOW
+#define FP_EX_UNDERFLOW		FE_UNDERFLOW
+#define FP_EX_DIVZERO		FE_DIVBYZERO
+#define FP_EX_INEXACT		FE_INEXACT
+
+#define _FP_TININESS_AFTER_ROUNDING 1
+
+#ifdef __riscv_flen
+# define FP_INIT_ROUNDMODE			\
+do {						\
+  __asm__ volatile ("frrm %0" : "=r" (_frm));	\
+} while (0)
+
+# define FP_HANDLE_EXCEPTIONS					\
+do {								\
+  if (__builtin_expect (_fex, 0))				\
+    __asm__ volatile ("csrs fflags, %0" : : "rK" (_fex));	\
+} while (0)
+#else
+# define FP_INIT_ROUNDMODE	_frm = FP_RND_NEAREST
+#endif
-- 
2.13.6


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