[glibc] LoongArch: Hard Float Support for float-point classification functions.

[Yinyu Cai <caiyinyu@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5fe2647d3168194f3534bbf1c02930c891a25977

commit 5fe2647d3168194f3534bbf1c02930c891a25977
Author: Xiaolin Tang <tangxiaolin@loongson.cn>
Date:   Mon Nov 7 22:05:16 2022 +0800

    LoongArch: Hard Float Support for float-point classification functions.
    
    Use hardware Floating-point instruction fclass.{s/d} to implement
    classification functions, i.e finite{f/ }, fpclassify{f/ }, isnan{f/ },
    isinf{f/ }, issignaling{f/ }.
    
           *  sysdeps/loongarch/fpu/s_finite.c: New file.
           *  sysdeps/loongarch/fpu/s_finitef.c: Likewise.
           *  sysdeps/loongarch/fpu/s_fpclassify.c: Likewise.
           *  sysdeps/loongarch/fpu/s_fpclassifyf.c: Likewise.
           *  sysdeps/loongarch/fpu/s_isinf.c: Likewise.
           *  sysdeps/loongarch/fpu/s_isinff.c: Likewise.
           *  sysdeps/loongarch/fpu/s_isnan.c: Likewise.
           *  sysdeps/loongarch/fpu/s_isnanf.c: Likewise.
           *  sysdeps/loongarch/fpu/s_issignaling.c: Likewise.
           *  sysdeps/loongarch/fpu/s_issignalingf.c: Likewise.
           *  sysdeps/loongarch/fpu_control.h: Add _FCLASS_* macro.

Diff:
---
 sysdeps/loongarch/fpu/s_finite.c       | 30 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_finitef.c      | 30 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_fpclassify.c   | 38 ++++++++++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_fpclassifyf.c  | 38 ++++++++++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_isinf.c        | 30 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_isinff.c       | 30 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_isnan.c        | 31 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_isnanf.c       | 31 +++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_issignaling.c  | 29 ++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_issignalingf.c | 29 ++++++++++++++++++++++++++
 sysdeps/loongarch/fpu_control.h        | 17 +++++++++++++++
 11 files changed, 333 insertions(+)

diff --git a/sysdeps/loongarch/fpu/s_finite.c b/sysdeps/loongarch/fpu/s_finite.c
new file mode 100644
index 0000000000..a2e98f0b60
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_finite.c
@@ -0,0 +1,30 @@
+/* finite().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__finite (double x)
+{
+  int x_cond;
+  asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return  x_cond & ~(_FCLASS_INF | _FCLASS_NAN);
+}
+hidden_def (__finite)
+weak_alias (__finite, finite)
diff --git a/sysdeps/loongarch/fpu/s_finitef.c b/sysdeps/loongarch/fpu/s_finitef.c
new file mode 100644
index 0000000000..9ffab38abd
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_finitef.c
@@ -0,0 +1,30 @@
+/* finitef().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__finitef (float x)
+{
+  int x_cond;
+  asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return  x_cond & ~(_FCLASS_INF | _FCLASS_NAN);
+}
+hidden_def (__finitef)
+weak_alias (__finitef, finitef)
diff --git a/sysdeps/loongarch/fpu/s_fpclassify.c b/sysdeps/loongarch/fpu/s_fpclassify.c
new file mode 100644
index 0000000000..3f4d95da66
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fpclassify.c
@@ -0,0 +1,38 @@
+/* fpclassify().  LoongArch version.
+   Copyright (C) 2017-2022 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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__fpclassify (double x)
+{
+  int cls;
+  asm volatile ("fclass.d \t%0, %1" : "=f" (cls) : "f" (x));
+
+  if (__glibc_likely (!!(cls & _FCLASS_NORM)))
+    return FP_NORMAL;
+  if (__glibc_likely (!!(cls & _FCLASS_ZERO)))
+    return FP_ZERO;
+  if (__glibc_likely (!!(cls & _FCLASS_SUBNORM)))
+    return FP_SUBNORMAL;
+  if (__glibc_likely (!!(cls & _FCLASS_INF)))
+    return FP_INFINITE;
+  return FP_NAN;
+}
+libm_hidden_def (__fpclassify)
diff --git a/sysdeps/loongarch/fpu/s_fpclassifyf.c b/sysdeps/loongarch/fpu/s_fpclassifyf.c
new file mode 100644
index 0000000000..b7c8b25337
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fpclassifyf.c
@@ -0,0 +1,38 @@
+/* Copyright (C) 2017-2022 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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__fpclassifyf (float x)
+{
+  int cls;
+  asm volatile ("fclass.s \t%0, %1" : "=f" (cls) : "f" (x));
+
+  if (__glibc_likely (!!(cls & _FCLASS_NORM)))
+    return FP_NORMAL;
+  if (__glibc_likely (!!(cls & _FCLASS_ZERO)))
+    return FP_ZERO;
+  if (__glibc_likely (!!(cls & _FCLASS_SUBNORM)))
+    return FP_SUBNORMAL;
+  if (__glibc_likely (!!(cls & _FCLASS_INF)))
+    return FP_INFINITE;
+  return FP_NAN;
+}
+libm_hidden_def (__fpclassifyf)
diff --git a/sysdeps/loongarch/fpu/s_isinf.c b/sysdeps/loongarch/fpu/s_isinf.c
new file mode 100644
index 0000000000..c7a6784185
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_isinf.c
@@ -0,0 +1,30 @@
+/* isinf().  LoongArch version.
+   Copyright (C) 2017-2022 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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__isinf (double x)
+{
+  int x_cond;
+  asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return -((x_cond & _FCLASS_MINF) ? 1 : 0) | ((x_cond & _FCLASS_PINF) ? 1 : 0);
+}
+hidden_def (__isinf)
+weak_alias (__isinf, isinf)
diff --git a/sysdeps/loongarch/fpu/s_isinff.c b/sysdeps/loongarch/fpu/s_isinff.c
new file mode 100644
index 0000000000..dcb4e04ec8
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_isinff.c
@@ -0,0 +1,30 @@
+/* isinff().  LoongArch version.
+   Copyright (C) 2017-2022 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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__isinff (float x)
+{
+  int x_cond;
+  asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return -((x_cond & _FCLASS_MINF) ? 1 : 0) | ((x_cond & _FCLASS_PINF) ? 1 : 0);
+}
+hidden_def (__isinff)
+weak_alias (__isinff, isinff)
diff --git a/sysdeps/loongarch/fpu/s_isnan.c b/sysdeps/loongarch/fpu/s_isnan.c
new file mode 100644
index 0000000000..62bb2e2fad
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_isnan.c
@@ -0,0 +1,31 @@
+/* isnan().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__isnan (double x)
+{
+  int x_cond;
+  asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+
+  return (x_cond & _FCLASS_NAN) != 0;
+}
+hidden_def (__isnan)
+weak_alias (__isnan, isnan)
diff --git a/sysdeps/loongarch/fpu/s_isnanf.c b/sysdeps/loongarch/fpu/s_isnanf.c
new file mode 100644
index 0000000000..bbdedb8429
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_isnanf.c
@@ -0,0 +1,31 @@
+/* isnanf().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__isnanf (float x)
+{
+  int x_cond;
+  asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+
+  return (x_cond & _FCLASS_NAN) != 0;
+}
+hidden_def (__isnanf)
+weak_alias (__isnanf, isnanf)
diff --git a/sysdeps/loongarch/fpu/s_issignaling.c b/sysdeps/loongarch/fpu/s_issignaling.c
new file mode 100644
index 0000000000..4fe0e2b7a9
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_issignaling.c
@@ -0,0 +1,29 @@
+/* issignaling().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__issignaling (double x)
+{
+  int x_cond;
+  asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return (x_cond & _FCLASS_SNAN) != 0;
+}
+libm_hidden_def (__issignaling)
diff --git a/sysdeps/loongarch/fpu/s_issignalingf.c b/sysdeps/loongarch/fpu/s_issignalingf.c
new file mode 100644
index 0000000000..d82abb0e74
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_issignalingf.c
@@ -0,0 +1,29 @@
+/* issignalingf().  LoongArch version.
+   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/>.  */
+
+#include <math.h>
+#include <fenv_private.h>
+
+int
+__issignalingf (float x)
+{
+  int x_cond;
+  asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+  return (x_cond & _FCLASS_SNAN) != 0;
+}
+libm_hidden_def (__issignalingf)
diff --git a/sysdeps/loongarch/fpu_control.h b/sysdeps/loongarch/fpu_control.h
index f482395dba..13436335fe 100644
--- a/sysdeps/loongarch/fpu_control.h
+++ b/sysdeps/loongarch/fpu_control.h
@@ -97,6 +97,23 @@ extern void __loongarch_fpu_setcw (fpu_control_t) __THROW;
 /* Default control word set at startup.  */
 extern fpu_control_t __fpu_control;
 
+# define _FCLASS_SNAN     (1 << 0)
+# define _FCLASS_QNAN     (1 << 1)
+# define _FCLASS_MINF     (1 << 2)
+# define _FCLASS_MNORM    (1 << 3)
+# define _FCLASS_MSUBNORM (1 << 4)
+# define _FCLASS_MZERO    (1 << 5)
+# define _FCLASS_PINF     (1 << 6)
+# define _FCLASS_PNORM    (1 << 7)
+# define _FCLASS_PSUBNORM (1 << 8)
+# define _FCLASS_PZERO    (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 /* __loongarch_soft_float */
 
 #endif /* fpu_control.h */