Patchwork [08/12] RISC-V: RV32D, RV64F, and RV64D Support

login
register
mail settings
Submitter Palmer Dabbelt
Date June 14, 2017, 6:30 p.m.
Message ID <20170614183048.11040-9-palmer@dabbelt.com>
Download mbox | patch
Permalink /patch/21021/
State New
Headers show

Comments

Palmer Dabbelt - June 14, 2017, 6:30 p.m.
This patch adds support for the various other hardware floating point
configurations that RISC-V supports.  This is split from the RV32F patch
to avoid mailing list size restrictions.
---
 sysdeps/riscv/rv64/rvd/s_ceil.c      | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_floor.c     | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_llrint.c    | 31 ++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_llround.c   | 31 ++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_nearbyint.c | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_rint.c      | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_round.c     | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvd/s_trunc.c     | 50 ++++++++++++++++++++++++++++++++++++
 sysdeps/riscv/rv64/rvf/s_llrintf.c   | 31 ++++++++++++++++++++++
 sysdeps/riscv/rv64/rvf/s_llroundf.c  | 31 ++++++++++++++++++++++
 sysdeps/riscv/rvd/e_sqrt.c           | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_copysign.c       | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_fabs.c           | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_finite.c         | 28 ++++++++++++++++++++
 sysdeps/riscv/rvd/s_fma.c            | 29 +++++++++++++++++++++
 sysdeps/riscv/rvd/s_fmax.c           | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_fmin.c           | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_fpclassify.c     | 36 ++++++++++++++++++++++++++
 sysdeps/riscv/rvd/s_isinf.c          | 29 +++++++++++++++++++++
 sysdeps/riscv/rvd/s_isnan.c          | 28 ++++++++++++++++++++
 sysdeps/riscv/rvd/s_issignaling.c    | 27 +++++++++++++++++++
 sysdeps/riscv/rvd/s_lrint.c          | 33 ++++++++++++++++++++++++
 sysdeps/riscv/rvd/s_lround.c         | 33 ++++++++++++++++++++++++
 23 files changed, 802 insertions(+)
 create mode 100644 sysdeps/riscv/rv64/rvd/s_ceil.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_floor.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_llrint.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_llround.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_nearbyint.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_rint.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_round.c
 create mode 100644 sysdeps/riscv/rv64/rvd/s_trunc.c
 create mode 100644 sysdeps/riscv/rv64/rvf/s_llrintf.c
 create mode 100644 sysdeps/riscv/rv64/rvf/s_llroundf.c
 create mode 100644 sysdeps/riscv/rvd/e_sqrt.c
 create mode 100644 sysdeps/riscv/rvd/s_copysign.c
 create mode 100644 sysdeps/riscv/rvd/s_fabs.c
 create mode 100644 sysdeps/riscv/rvd/s_finite.c
 create mode 100644 sysdeps/riscv/rvd/s_fma.c
 create mode 100644 sysdeps/riscv/rvd/s_fmax.c
 create mode 100644 sysdeps/riscv/rvd/s_fmin.c
 create mode 100644 sysdeps/riscv/rvd/s_fpclassify.c
 create mode 100644 sysdeps/riscv/rvd/s_isinf.c
 create mode 100644 sysdeps/riscv/rvd/s_isnan.c
 create mode 100644 sysdeps/riscv/rvd/s_issignaling.c
 create mode 100644 sysdeps/riscv/rvd/s_lrint.c
 create mode 100644 sysdeps/riscv/rvd/s_lround.c
Joseph Myers - June 14, 2017, 9:16 p.m.
Same comments apply as for the float patch, regarding not needing a 
special fabs implementation, and the possibility of using hardware 
rounding instructions to implement roundeven similar to the other 
round-to-integer functions.

Patch

diff --git a/sysdeps/riscv/rv64/rvd/s_ceil.c b/sysdeps/riscv/rv64/rvd/s_ceil.c
new file mode 100644
index 0000000000..93d613cab1
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_ceil.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__ceil (double x)
+{
+  int flags = riscv_getflags ();
+  int nan = isnan (x);
+  double mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm volatile ("fcvt.l.d %0, %1, rup" : "=r" (i) : "f" (x));
+      asm volatile ("fcvt.d.l %0, %1, rup" : "=f" (new_x) : "r" (i));
+
+      /* ceil(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+
+      riscv_setflags (flags);
+    }
+
+  return x;
+}
+
+weak_alias (__ceil, ceil)
diff --git a/sysdeps/riscv/rv64/rvd/s_floor.c b/sysdeps/riscv/rv64/rvd/s_floor.c
new file mode 100644
index 0000000000..db4ad9b153
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_floor.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__floor (double x)
+{
+  int flags = riscv_getflags ();
+  int nan = isnan (x);
+  double mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm volatile ("fcvt.l.d %0, %1, rdn" : "=r" (i) : "f" (x));
+      asm volatile ("fcvt.d.l %0, %1, rdn" : "=f" (new_x) : "r" (i));
+
+      /* floor(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+
+      riscv_setflags (flags);
+    }
+
+  return x;
+}
+
+weak_alias (__floor, floor)
diff --git a/sysdeps/riscv/rv64/rvd/s_llrint.c b/sysdeps/riscv/rv64/rvd/s_llrint.c
new file mode 100644
index 0000000000..47a60b9f58
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_llrint.c
@@ -0,0 +1,31 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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/>.  */
+
+long long
+__llrint (double x)
+{
+  long long res;
+  asm ("fcvt.l.d %0, %1" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__llrint, llrint)
+#ifdef __LP64__
+strong_alias (__llrint, __lrint)
+weak_alias (__llrint, lrint)
+#endif
diff --git a/sysdeps/riscv/rv64/rvd/s_llround.c b/sysdeps/riscv/rv64/rvd/s_llround.c
new file mode 100644
index 0000000000..4563240509
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_llround.c
@@ -0,0 +1,31 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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/>.  */
+
+long long
+__llround (double x)
+{
+  long long res;
+  asm ("fcvt.l.d %0, %1, rmm" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__llround, llround)
+#ifdef __LP64__
+strong_alias (__llround, __lround)
+weak_alias (__llround, lround)
+#endif
diff --git a/sysdeps/riscv/rv64/rvd/s_nearbyint.c b/sysdeps/riscv/rv64/rvd/s_nearbyint.c
new file mode 100644
index 0000000000..ea1805d9a0
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_nearbyint.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__nearbyint (double x)
+{
+  int flags = riscv_getflags ();
+  int nan = isnan (x);
+  double mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm volatile ("fcvt.l.d %0, %1" : "=r" (i) : "f" (x));
+      asm volatile ("fcvt.d.l %0, %1" : "=f" (new_x) : "r" (i));
+
+      /* nearbyint(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+
+      riscv_setflags (flags);
+    }
+
+  return x;
+}
+
+weak_alias (__nearbyint, nearbyint)
diff --git a/sysdeps/riscv/rv64/rvd/s_rint.c b/sysdeps/riscv/rv64/rvd/s_rint.c
new file mode 100644
index 0000000000..08d218178a
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_rint.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__rint (double x)
+{
+  int nan;
+  double mag;
+
+  nan = isnan (x);
+  mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm ("fcvt.l.d %0, %1" : "=r" (i) : "f" (x));
+      asm ("fcvt.d.l %0, %1" : "=f" (new_x) : "r" (i));
+
+      /* rint(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+    }
+
+  return x;
+}
+
+weak_alias (__rint, rint)
diff --git a/sysdeps/riscv/rv64/rvd/s_round.c b/sysdeps/riscv/rv64/rvd/s_round.c
new file mode 100644
index 0000000000..5cc3370ba4
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_round.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__round (double x)
+{
+  int flags = riscv_getflags ();
+  int nan = isnan (x);
+  double mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm volatile ("fcvt.l.d %0, %1, rmm" : "=r" (i) : "f" (x));
+      asm volatile ("fcvt.d.l %0, %1, rmm" : "=f" (new_x) : "r" (i));
+
+      /* round(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+
+      riscv_setflags (flags);
+    }
+
+  return x;
+}
+
+weak_alias (__round, round)
diff --git a/sysdeps/riscv/rv64/rvd/s_trunc.c b/sysdeps/riscv/rv64/rvd/s_trunc.c
new file mode 100644
index 0000000000..0b5482025e
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/s_trunc.c
@@ -0,0 +1,50 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+double
+__trunc (double x)
+{
+  int flags = riscv_getflags ();
+  int nan = isnan (x);
+  double mag = fabs (x);
+
+  if (nan)
+    return x + x;
+
+  if (mag < (1ULL << __DBL_MANT_DIG__))
+    {
+      long i;
+      double new_x;
+
+      asm volatile ("fcvt.l.d %0, %1, rtz" : "=r" (i) : "f" (x));
+      asm volatile ("fcvt.d.l %0, %1, rtz" : "=f" (new_x) : "r" (i));
+
+      /* trunc(-0) == -0, and in general we'll always have the same
+	 sign as our input.  */
+      x = copysign (new_x, x);
+
+      riscv_setflags (flags);
+    }
+
+  return x;
+}
+
+weak_alias (__trunc, trunc)
diff --git a/sysdeps/riscv/rv64/rvf/s_llrintf.c b/sysdeps/riscv/rv64/rvf/s_llrintf.c
new file mode 100644
index 0000000000..5f2bed76af
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvf/s_llrintf.c
@@ -0,0 +1,31 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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/>.  */
+
+long long
+__llrintf (float x)
+{
+  long long res;
+  asm ("fcvt.l.s %0, %1" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__llrintf, llrintf)
+#ifdef __LP64__
+strong_alias (__llrintf, __lrintf)
+weak_alias (__llrintf, lrintf)
+#endif
diff --git a/sysdeps/riscv/rv64/rvf/s_llroundf.c b/sysdeps/riscv/rv64/rvf/s_llroundf.c
new file mode 100644
index 0000000000..9f992bfbaf
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvf/s_llroundf.c
@@ -0,0 +1,31 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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/>.  */
+
+long long
+__llroundf (float x)
+{
+  long long res;
+  asm ("fcvt.l.s %0, %1, rmm" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__llroundf, llroundf)
+#ifdef __LP64__
+strong_alias (__llroundf, __lroundf)
+weak_alias (__llroundf, lroundf)
+#endif
diff --git a/sysdeps/riscv/rvd/e_sqrt.c b/sysdeps/riscv/rvd/e_sqrt.c
new file mode 100644
index 0000000000..3dc8a81721
--- /dev/null
+++ b/sysdeps/riscv/rvd/e_sqrt.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+
+double
+__ieee754_sqrt (double x)
+{
+  asm ("fsqrt.d %0, %1" : "=f" (x) : "f" (x));
+  return x;
+}
+strong_alias (__ieee754_sqrt, __sqrt_finite)
diff --git a/sysdeps/riscv/rvd/s_copysign.c b/sysdeps/riscv/rvd/s_copysign.c
new file mode 100644
index 0000000000..58b9babd64
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_copysign.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+
+double
+__copysign (double x, double y)
+{
+  asm ("fsgnj.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+weak_alias (__copysign, copysign)
diff --git a/sysdeps/riscv/rvd/s_fabs.c b/sysdeps/riscv/rvd/s_fabs.c
new file mode 100644
index 0000000000..9c762307ad
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_fabs.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+
+double
+__fabs (double x)
+{
+  asm ("fabs.d %0, %1" : "=f" (x) : "f" (x));
+  return x;
+}
+weak_alias (__fabs, fabs)
diff --git a/sysdeps/riscv/rvd/s_finite.c b/sysdeps/riscv/rvd/s_finite.c
new file mode 100644
index 0000000000..95e51dddf3
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_finite.c
@@ -0,0 +1,28 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+int
+__finite (double x)
+{
+  return _FCLASS (x) & ~(_FCLASS_INF | _FCLASS_NAN);
+}
+hidden_def (__finite)
+weak_alias (__finite, finite)
diff --git a/sysdeps/riscv/rvd/s_fma.c b/sysdeps/riscv/rvd/s_fma.c
new file mode 100644
index 0000000000..f1f4adf28b
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_fma.c
@@ -0,0 +1,29 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <fenv.h>
+#include <ieee754.h>
+
+double
+__fma (double x, double y, double z)
+{
+  asm ("fmadd.d %0, %1, %2, %3" : "=f" (x) : "f" (x), "f" (y), "f" (z));
+  return x;
+}
+weak_alias (__fma, fma)
diff --git a/sysdeps/riscv/rvd/s_fmax.c b/sysdeps/riscv/rvd/s_fmax.c
new file mode 100644
index 0000000000..c0c6b8ea2b
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_fmax.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+
+double
+__fmax (double x, double y)
+{
+  asm ("fmax.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+weak_alias (__fmax, fmax)
diff --git a/sysdeps/riscv/rvd/s_fmin.c b/sysdeps/riscv/rvd/s_fmin.c
new file mode 100644
index 0000000000..b71c076a60
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_fmin.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+
+double
+__fmin (double x, double y)
+{
+  asm ("fmin.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+weak_alias (__fmin, fmin)
diff --git a/sysdeps/riscv/rvd/s_fpclassify.c b/sysdeps/riscv/rvd/s_fpclassify.c
new file mode 100644
index 0000000000..b02a7be8cf
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_fpclassify.c
@@ -0,0 +1,36 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+int
+__fpclassify (double x)
+{
+  int cls = _FCLASS (x);
+  if (__builtin_expect (cls & _FCLASS_NORM, _FCLASS_NORM))
+    return FP_NORMAL;
+  if (__builtin_expect (cls & _FCLASS_ZERO, _FCLASS_ZERO))
+    return FP_ZERO;
+  if (__builtin_expect (cls & _FCLASS_SUBNORM, _FCLASS_SUBNORM))
+    return FP_SUBNORMAL;
+  if (__builtin_expect (cls & _FCLASS_INF, _FCLASS_INF))
+    return FP_INFINITE;
+  return FP_NAN;
+}
+libm_hidden_def (__fpclassify)
diff --git a/sysdeps/riscv/rvd/s_isinf.c b/sysdeps/riscv/rvd/s_isinf.c
new file mode 100644
index 0000000000..bc2382e5b7
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_isinf.c
@@ -0,0 +1,29 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+int
+__isinf (double x)
+{
+  int cls = _FCLASS (x);
+  return -((cls & _FCLASS_MINF) ? 1 : 0) | ((cls & _FCLASS_PINF) ? 1 : 0);
+}
+hidden_def (__isinf)
+weak_alias (__isinf, isinf)
diff --git a/sysdeps/riscv/rvd/s_isnan.c b/sysdeps/riscv/rvd/s_isnan.c
new file mode 100644
index 0000000000..b7567336f6
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_isnan.c
@@ -0,0 +1,28 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+int
+__isnan (double x)
+{
+  return _FCLASS (x) & _FCLASS_NAN;
+}
+hidden_def (__isnan)
+weak_alias (__isnan, isnan)
diff --git a/sysdeps/riscv/rvd/s_issignaling.c b/sysdeps/riscv/rvd/s_issignaling.c
new file mode 100644
index 0000000000..8853b00bae
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_issignaling.c
@@ -0,0 +1,27 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 <math.h>
+#include <math_private.h>
+
+int
+__issignaling (double x)
+{
+  return _FCLASS (x) & _FCLASS_SNAN;
+}
+libm_hidden_def (__issignaling)
diff --git a/sysdeps/riscv/rvd/s_lrint.c b/sysdeps/riscv/rvd/s_lrint.c
new file mode 100644
index 0000000000..90b4be0184
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_lrint.c
@@ -0,0 +1,33 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 __LP64__
+
+#include <math.h>
+
+long
+__lrint (double x)
+{
+  long res;
+  asm ("fcvt.w.d %0, %1" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__lrint, lrint)
+
+#endif
diff --git a/sysdeps/riscv/rvd/s_lround.c b/sysdeps/riscv/rvd/s_lround.c
new file mode 100644
index 0000000000..617fc3dcb7
--- /dev/null
+++ b/sysdeps/riscv/rvd/s_lround.c
@@ -0,0 +1,33 @@ 
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   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 __LP64__
+
+#include <math.h>
+
+long
+__lround (double x)
+{
+  long res;
+  asm ("fcvt.w.d %0, %1, rmm" : "=r" (res) : "f" (x));
+  return res;
+}
+
+weak_alias (__lround, lround)
+
+#endif