[PATCH 2/6] MIPS/math: Define port-specific GET_HIGH_WORD

[YunQiang Su <syq@gcc.gnu.org>]

The generic implemention may issue some unneeded stack store and
load operations.

	* sysdeps/mips/math_private.h

Signed-off-by: YunQiang Su <syq@gcc.gnu.org>
---
 sysdeps/mips/math_private.h | 56 +++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 sysdeps/mips/math_private.h

diff --git a/sysdeps/mips/math_private.h b/sysdeps/mips/math_private.h
new file mode 100644
index 0000000000..4da8b0c2d9
--- /dev/null
+++ b/sysdeps/mips/math_private.h
@@ -0,0 +1,56 @@
+/* Copyright (C) 2024 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 MIPS_MATH_PRIVATE_H
+#define MIPS_MATH_PRIVATE_H 1
+
+#include <math.h>
+#include <nan-high-order-bit.h>
+#include_next <math_private.h>
+#include <fpu_control.h>
+
+#if defined(__mips_hard_float) && !defined(__mips_single_float)
+#  undef GET_HIGH_WORD
+#  if __mips_isa_rev >= 2
+#    define GET_HIGH_WORD(i, d)                                               \
+      do                                                                      \
+	{                                                                     \
+	  asm volatile("mfhc1  %0, %1" : "=r"(i) : "f"(d));                   \
+	}                                                                     \
+      while (0)
+#  elif defined(__mips64)
+#    define GET_HIGH_WORD(i, d)                                               \
+      do                                                                      \
+	{                                                                     \
+	  long long di;                                                       \
+	  asm volatile("dmfc1  %0, %1" : "=r"(di) : "f"(d));                  \
+	  i = di >> 32;                                                       \
+	}                                                                     \
+      while (0)
+#  else
+#    define GET_HIGH_WORD(i, d)                                               \
+      do                                                                      \
+	{                                                                     \
+	  long long tmp[1];                                                   \
+	  asm volatile("sdc1 %1, %0" : "=m"(tmp) : "f"(d));                   \
+	  (i) = tmp[0] >> 32;                                                 \
+	}                                                                     \
+      while (0)
+#  endif
+#endif /* __mips_hard_float && !__mips_single_float */
+
+#endif /* MIPS_MATH_PRIVATE_H */
-- 
2.39.2