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* [glibc] soft-fp: Add __extendhfxf2 and __truncxfhf2
@ 2021-07-01 18:03 H.J. Lu
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From: H.J. Lu @ 2021-07-01 18:03 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8241409e29a347ff6613d28d13cb1c7cdf1ec888
commit 8241409e29a347ff6613d28d13cb1c7cdf1ec888
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Jul 1 08:35:28 2021 -0700
soft-fp: Add __extendhfxf2 and __truncxfhf2
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:
https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html
support in GCC.
Diff:
---
soft-fp/extendhfxf2.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
soft-fp/truncxfhf2.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 105 insertions(+)
diff --git a/soft-fp/extendhfxf2.c b/soft-fp/extendhfxf2.c
new file mode 100644
index 0000000000..1cb5fef947
--- /dev/null
+++ b/soft-fp/extendhfxf2.c
@@ -0,0 +1,53 @@
+/* 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;
+}
diff --git a/soft-fp/truncxfhf2.c b/soft-fp/truncxfhf2.c
new file mode 100644
index 0000000000..688ad24523
--- /dev/null
+++ b/soft-fp/truncxfhf2.c
@@ -0,0 +1,52 @@
+/* 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;
+}
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