LoongArch: Generic <math.h> and soft-fp Routines

1 files changed, 90 insertions, 0 deletions

diff --git a/sysdeps/loongarch/bits/fenv.h b/sysdeps/loongarch/bits/fenv.h
new file mode 100644
index 0000000000..7e223b402b
--- /dev/null
+++ b/sysdeps/loongarch/bits/fenv.h
@@ -0,0 +1,90 @@
+/* Floating point environment.
+   Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _FENV_H
+#error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+/* Define bits representing the exception.  We use the bit positions
+   of the appropriate bits in the FPU control word.  */
+enum
+{
+  FE_INEXACT =
+#define FE_INEXACT 0x010000
+    FE_INEXACT,
+  FE_UNDERFLOW =
+#define FE_UNDERFLOW 0x020000
+    FE_UNDERFLOW,
+  FE_OVERFLOW =
+#define FE_OVERFLOW 0x040000
+    FE_OVERFLOW,
+  FE_DIVBYZERO =
+#define FE_DIVBYZERO 0x080000
+    FE_DIVBYZERO,
+  FE_INVALID =
+#define FE_INVALID 0x100000
+    FE_INVALID,
+};
+
+#define FE_ALL_EXCEPT \
+  (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+/* The LoongArch FPU supports all of the four defined rounding modes.  We
+   use again the bit positions in the FPU control word as the values
+   for the appropriate macros.  */
+enum
+{
+  FE_TONEAREST =
+#define FE_TONEAREST 0x000
+    FE_TONEAREST,
+  FE_TOWARDZERO =
+#define FE_TOWARDZERO 0x100
+    FE_TOWARDZERO,
+  FE_UPWARD =
+#define FE_UPWARD 0x200
+    FE_UPWARD,
+  FE_DOWNWARD =
+#define FE_DOWNWARD 0x300
+    FE_DOWNWARD
+};
+
+/* Type representing exception flags.  */
+typedef unsigned int fexcept_t;
+
+/* Type representing floating-point environment.  This function corresponds
+   to the layout of the block written by the `fstenv'.  */
+typedef struct
+{
+  unsigned int __fp_control_register;
+} fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV ((const fenv_t *) -1)
+
+#ifdef __USE_GNU
+/* Floating-point environment where none of the exception is masked.  */
+#define FE_NOMASK_ENV ((const fenv_t *) -257)
+#endif
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* 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