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From 855d045bc26175195dadafc28abf84e7b6613aac Mon Sep 17 00:00:00 2001
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From: Stefan Liebler <stli@linux.ibm.com>
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Date: Wed, 11 Dec 2019 15:09:28 +0100
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Subject: [PATCH 19/28] S390: Use load-fp-integer instruction for roundeven
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functions.
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If compiled with z196 zarch support, the load-fp-integer instruction
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is used to implement roundeven, roundevenf, roundevenl.
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Otherwise the common-code implementation is used.
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(cherry picked from commit 4399b163376b331773e43917dcf56ce68e43e6a0)
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---
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sysdeps/s390/fpu/s_roundeven.c | 39 +++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_roundevenf.c | 38 ++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_roundevenl.c | 39 +++++++++++++++++++++++++++++++++
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3 files changed, 116 insertions(+)
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create mode 100644 sysdeps/s390/fpu/s_roundeven.c
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create mode 100644 sysdeps/s390/fpu/s_roundevenf.c
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create mode 100644 sysdeps/s390/fpu/s_roundevenl.c
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diff --git a/sysdeps/s390/fpu/s_roundeven.c b/sysdeps/s390/fpu/s_roundeven.c
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new file mode 100644
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index 0000000000..95a83a70e8
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_roundeven.c
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@@ -0,0 +1,39 @@
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+/* roundeven() - S390 version.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public License as
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+ published by the Free Software Foundation; either version 2.1 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+# include <math.h>
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+# include <libm-alias-double.h>
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+
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+double
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+__roundeven (double x)
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+{
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+ double y;
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+ /* The z196 zarch "load fp integer" (fidbra) instruction is rounding
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+ x to the nearest integer with "ties to even" rounding mode
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+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
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+ __asm__ ("fidbra %0,4,%1,4" : "=f" (y) : "f" (x));
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+ return y;
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+}
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+hidden_def (__roundeven)
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+libm_alias_double (__roundeven, roundeven)
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+
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+#else
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+# include <sysdeps/ieee754/dbl-64/s_roundeven.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_roundevenf.c b/sysdeps/s390/fpu/s_roundevenf.c
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new file mode 100644
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index 0000000000..c620a0189c
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_roundevenf.c
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@@ -0,0 +1,38 @@
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+/* roundevenf() - S390 version.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public License as
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+ published by the Free Software Foundation; either version 2.1 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+# include <math.h>
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+# include <libm-alias-float.h>
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+
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+float
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+__roundevenf (float x)
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+{
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+ float y;
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+ /* The z196 zarch "load fp integer" (fiebra) instruction is rounding
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+ x to the nearest integer with "ties to even" rounding mode
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+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
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+ __asm__ ("fiebra %0,4,%1,4" : "=f" (y) : "f" (x));
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+ return y;
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+}
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+libm_alias_float (__roundeven, roundeven)
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+
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+#else
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+# include <sysdeps/ieee754/flt-32/s_roundevenf.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_roundevenl.c b/sysdeps/s390/fpu/s_roundevenl.c
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new file mode 100644
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index 0000000000..3481af2665
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_roundevenl.c
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@@ -0,0 +1,39 @@
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+/* roundevenl() - S390 version.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public License as
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+ published by the Free Software Foundation; either version 2.1 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+# include <math.h>
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+# include <math_private.h>
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+# include <libm-alias-ldouble.h>
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+
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+_Float128
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+__roundevenl (_Float128 x)
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+{
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+ _Float128 y;
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+ /* The z196 zarch "load fp integer" (fixbra) instruction is rounding
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+ x to the nearest integer with "ties to even" rounding mode
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+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
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+ __asm__ ("fixbra %0,4,%1,4" : "=f" (y) : "f" (x));
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+ return y;
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+}
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+libm_alias_ldouble (__roundeven, roundeven)
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+
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+#else
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+# include <sysdeps/ieee754/ldbl-128/s_roundevenl.c>
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+#endif
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--
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2.18.2
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