From: Xi Ruoyao <xry111@xry111.site>
To: libc-alpha@sourceware.org
Cc: caiyinyu <caiyinyu@loongson.cn>, Wang Xuerui <i@xen0n.name>,
Xi Ruoyao <xry111@xry111.site>
Subject: [PATCH] LoongArch: Add math-barriers.h
Date: Tue, 14 Feb 2023 16:57:13 +0800 [thread overview]
Message-ID: <20230214085713.44338-1-xry111@xry111.site> (raw)
This patch implements the LoongArch specific math barriers in order to omit
the store and load from stack if possible.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
---
sysdeps/loongarch/fpu/math-barriers.h | 28 +++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
create mode 100644 sysdeps/loongarch/fpu/math-barriers.h
diff --git a/sysdeps/loongarch/fpu/math-barriers.h b/sysdeps/loongarch/fpu/math-barriers.h
new file mode 100644
index 0000000000..3e977e43a6
--- /dev/null
+++ b/sysdeps/loongarch/fpu/math-barriers.h
@@ -0,0 +1,28 @@
+/* Control when floating-point expressions are evaluated. LoongArch version.
+ Copyright (C) 2023 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 _LOONGARCH_MATH_BARRIERS_H
+#define _LOONGARCH_MATH_BARRIERS_H 1
+
+/* Generic code forces values to memory; we don't need to do that. */
+#define math_opt_barrier(x) \
+ ({ __typeof (x) __x = (x); __asm ("" : "+frm" (__x)); __x; })
+#define math_force_eval(x) \
+ ({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "frm" (__x)); })
+
+#endif /* math-barriers.h */
--
2.37.0
next reply other threads:[~2023-02-14 8:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-14 8:57 Xi Ruoyao [this message]
2023-02-15 13:47 ` Adhemerval Zanella Netto
2023-02-15 14:22 ` Xi Ruoyao
2023-02-15 14:25 ` Adhemerval Zanella Netto
2023-02-16 13:02 ` Xi Ruoyao
2023-02-16 13:43 ` Adhemerval Zanella Netto
2023-02-27 10:45 ` Xi Ruoyao
2023-02-27 11:23 ` Adhemerval Zanella Netto
2023-02-27 11:25 ` WANG Xuerui
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