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* [glibc] AArch64: Add support for roundeven[f]
@ 2021-06-08 12:36 Wilco Dijkstra
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From: Wilco Dijkstra @ 2021-06-08 12:36 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6a86bc099219a656be479d5f31ff90ec7860b112
commit 6a86bc099219a656be479d5f31ff90ec7860b112
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Tue Jun 8 13:33:09 2021 +0100
AArch64: Add support for roundeven[f]
Add inline assembler for the roundeven functions.
Passes GLIBC regression. Note GCC does not inline the builtin (PR100966),
so this cannot be used for now.
Diff:
---
sysdeps/aarch64/fpu/s_roundeven.c | 29 +++++++++++++++++++++++++++++
sysdeps/aarch64/fpu/s_roundevenf.c | 28 ++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)
diff --git a/sysdeps/aarch64/fpu/s_roundeven.c b/sysdeps/aarch64/fpu/s_roundeven.c
new file mode 100644
index 0000000000..d74b40daf5
--- /dev/null
+++ b/sysdeps/aarch64/fpu/s_roundeven.c
@@ -0,0 +1,29 @@
+/* Copyright (C) 2021 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 <libm-alias-double.h>
+
+double
+__roundeven (double x)
+{
+ asm volatile ("frintn \t%d0, %d1" : "=w" (x) : "w" (x));
+ return x;
+}
+hidden_def (__roundeven)
+libm_alias_double (__roundeven, roundeven)
diff --git a/sysdeps/aarch64/fpu/s_roundevenf.c b/sysdeps/aarch64/fpu/s_roundevenf.c
new file mode 100644
index 0000000000..dfc492c2f8
--- /dev/null
+++ b/sysdeps/aarch64/fpu/s_roundevenf.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 2021 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 <libm-alias-float.h>
+
+float
+__roundevenf (float x)
+{
+ asm volatile ("frintn \t%s0, %s1" : "=w" (x) : "w" (x));
+ return x;
+}
+libm_alias_float (__roundeven, roundeven)
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