[v2,04/10] LoongArch: Hard Float Support for functions logb{f/ }, __ieee754_ilogb{f/ }.
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Commit Message
Use hardware Floating-point instruction flogb.{s/d}, fclass.{s/d} to
implement functions logb{f/ }, __ieee754_ilogb{f/ }.
* sysdeps/loongarch/fpu/e_ilogb.c: New file.
* sysdeps/loongarch/fpu/e_ilogbf.c: Likewise.
* sysdeps/loongarch/fpu/s_logb.c: Likewise.
* sysdeps/loongarch/fpu/s_logbf.c: Likewise.
---
sysdeps/loongarch/fpu/e_ilogb.c | 39 ++++++++++++++++++++++++++++++++
sysdeps/loongarch/fpu/e_ilogbf.c | 39 ++++++++++++++++++++++++++++++++
sysdeps/loongarch/fpu/s_logb.c | 30 ++++++++++++++++++++++++
sysdeps/loongarch/fpu/s_logbf.c | 30 ++++++++++++++++++++++++
4 files changed, 138 insertions(+)
create mode 100644 sysdeps/loongarch/fpu/e_ilogb.c
create mode 100644 sysdeps/loongarch/fpu/e_ilogbf.c
create mode 100644 sysdeps/loongarch/fpu/s_logb.c
create mode 100644 sysdeps/loongarch/fpu/s_logbf.c
new file mode 100644
@@ -0,0 +1,39 @@
+/* __ieee754_ilogb(). 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/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <fpu_control.h>
+
+int
+__ieee754_ilogb (double x)
+{
+ int x_cond;
+ asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+
+ if (__glibc_unlikely (x_cond & _FCLASS_ZERO))
+ return FP_ILOGB0;
+ else if (__glibc_unlikely (x_cond & ( _FCLASS_NAN | _FCLASS_INF)))
+ return FP_ILOGBNAN;
+ else
+ {
+ asm volatile ("fabs.d \t%0, %1" : "=f" (x) : "f" (x));
+ asm volatile ("flogb.d \t%0, %1" : "=f" (x) : "f" (x));
+ return x;
+ }
+}
new file mode 100644
@@ -0,0 +1,39 @@
+/* __ieee754_ilogbf(). 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/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <fpu_control.h>
+
+int
+__ieee754_ilogbf (float x)
+{
+ int x_cond;
+ asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+
+ if (__glibc_unlikely (x_cond & _FCLASS_ZERO))
+ return FP_ILOGB0;
+ else if (__glibc_unlikely (x_cond & ( _FCLASS_NAN | _FCLASS_INF)))
+ return FP_ILOGBNAN;
+ else
+ {
+ asm volatile ("fabs.s \t%0, %1" : "=f" (x) : "f" (x));
+ asm volatile ("flogb.s \t%0, %1" : "=f" (x) : "f" (x));
+ return x;
+ }
+}
new file mode 100644
@@ -0,0 +1,30 @@
+/* logb(). 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/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <libm-alias-double.h>
+
+double
+__logb (double x)
+{
+ asm volatile ("fabs.d \t%0, %1" : "=f" (x) : "f" (x));
+ asm volatile ("flogb.d \t%0, %1" : "=f" (x) : "f" (x));
+ return x;
+}
+libm_alias_double (__logb, logb)
new file mode 100644
@@ -0,0 +1,30 @@
+/* logbf(). 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/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <libm-alias-float.h>
+
+float
+__logbf (float x)
+{
+ asm volatile ("fabs.s \t%0, %1" : "=f" (x) : "f" (x));
+ asm volatile ("flogb.s \t%0, %1" : "=f" (x) : "f" (x));
+ return x;
+}
+libm_alias_float (__logb, logb)