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AArch64: Add support for roundeven[f]

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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.
This commit is contained in:
Wilco Dijkstra 2021-06-08 13:33:09 +01:00
parent b190bccc8a
commit 6a86bc0992
2 changed files with 57 additions and 0 deletions
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29
sysdeps/aarch64/fpu/s_roundeven.c Normal file
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/* 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)

28
sysdeps/aarch64/fpu/s_roundevenf.c Normal file
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/* 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)