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soft-fp: Update soft-fp from glibc

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This patch is updating soft-fp from glibc:

1. Add __extendhfxf2 to return an IEEE half converted to IEEE extended.
2. Add __truncxfhf2 to truncate IEEE extended into IEEE half.

These are needed by x86 _Float16 support.

	* soft-fp/extendhfxf2.c: New file.
	* soft-fp/truncxfhf2.c: Likewise.
This commit is contained in:
H.J. Lu 2021-07-01 12:27:00 -07:00
parent b544c348e1
commit 1a4b2224b8
2 changed files with 105 additions and 0 deletions
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53
libgcc/soft-fp/extendhfxf2.c Normal file
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/* Software floating-point emulation.
Return an IEEE half converted to IEEE extended.
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.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file into
combinations with other programs, and to distribute those
combinations without any restriction coming from the use of this
file. (The Lesser General Public License restrictions do apply in
other respects; for example, they cover modification of the file,
and distribution when not linked into a combine executable.)
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
<http://www.gnu.org/licenses/>. */
#define FP_NO_EXACT_UNDERFLOW
#include "soft-fp.h"
#include "half.h"
#include "extended.h"
XFtype
__extendhfxf2 (HFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
FP_DECL_E (R);
XFtype r;
FP_INIT_EXCEPTIONS;
FP_UNPACK_RAW_H (A, a);
#if _FP_W_TYPE_SIZE < 64
FP_EXTEND (E, H, 4, 1, R, A);
#else
FP_EXTEND (E, H, 2, 1, R, A);
#endif
FP_PACK_RAW_E (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

52
libgcc/soft-fp/truncxfhf2.c Normal file
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/* Software floating-point emulation.
Truncate IEEE extended into IEEE half.
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.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file into
combinations with other programs, and to distribute those
combinations without any restriction coming from the use of this
file. (The Lesser General Public License restrictions do apply in
other respects; for example, they cover modification of the file,
and distribution when not linked into a combine executable.)
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
<http://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "half.h"
#include "extended.h"
HFtype
__truncxfhf2 (XFtype a)
{
FP_DECL_EX;
FP_DECL_E (A);
FP_DECL_H (R);
HFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_E (A, a);
#if _FP_W_TYPE_SIZE < 64
FP_TRUNC (H, E, 1, 4, R, A);
#else
FP_TRUNC (H, E, 1, 2, R, A);
#endif
FP_PACK_SEMIRAW_H (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}