[07/17] S390: Use load-fp-integer instruction for roundeven functions.
Commit Message
If compiled with z196 zarch support, the load-fp-integer instruction
is used to implement roundeven, roundevenf, roundevenl.
Otherwise the common-code implementation is used.
---
sysdeps/s390/fpu/s_roundeven.c | 39 +++++++++++++++++++++++++++++++++
sysdeps/s390/fpu/s_roundevenf.c | 38 ++++++++++++++++++++++++++++++++
sysdeps/s390/fpu/s_roundevenl.c | 39 +++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
create mode 100644 sysdeps/s390/fpu/s_roundeven.c
create mode 100644 sysdeps/s390/fpu/s_roundevenf.c
create mode 100644 sysdeps/s390/fpu/s_roundevenl.c
Comments
PING.
This patch is still needed. If there are no further comments, I'll
commit this s390-only patch in a few days.
Bye,
Stefan
On 12/2/19 4:04 PM, Stefan Liebler wrote:
> PING.
> This patch is still needed. If there are no further comments, I'll
> commit this s390-only patch in a few days.
>
> Bye,
> Stefan
>
as information, I've just committed the remaining s390-only patches.
Bye,
Stefan
new file mode 100644
@@ -0,0 +1,39 @@
+/* roundeven() - S390 version.
+ Copyright (C) 2019 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/>. */
+
+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+# include <math.h>
+# include <libm-alias-double.h>
+
+double
+__roundeven (double x)
+{
+ double y;
+ /* The z196 zarch "load fp integer" (fidbra) instruction is rounding
+ x to the nearest integer with "ties to even" rounding mode
+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
+ __asm__ ("fidbra %0,4,%1,4" : "=f" (y) : "f" (x));
+ return y;
+}
+hidden_def (__roundeven)
+libm_alias_double (__roundeven, roundeven)
+
+#else
+# include <sysdeps/ieee754/dbl-64/s_roundeven.c>
+#endif
new file mode 100644
@@ -0,0 +1,38 @@
+/* roundevenf() - S390 version.
+ Copyright (C) 2019 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/>. */
+
+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+# include <math.h>
+# include <libm-alias-float.h>
+
+float
+__roundevenf (float x)
+{
+ float y;
+ /* The z196 zarch "load fp integer" (fiebra) instruction is rounding
+ x to the nearest integer with "ties to even" rounding mode
+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
+ __asm__ ("fiebra %0,4,%1,4" : "=f" (y) : "f" (x));
+ return y;
+}
+libm_alias_float (__roundeven, roundeven)
+
+#else
+# include <sysdeps/ieee754/flt-32/s_roundevenf.c>
+#endif
new file mode 100644
@@ -0,0 +1,39 @@
+/* roundevenl() - S390 version.
+ Copyright (C) 2019 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/>. */
+
+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+# include <math.h>
+# include <math_private.h>
+# include <libm-alias-ldouble.h>
+
+_Float128
+__roundevenl (_Float128 x)
+{
+ _Float128 y;
+ /* The z196 zarch "load fp integer" (fixbra) instruction is rounding
+ x to the nearest integer with "ties to even" rounding mode
+ (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
+ __asm__ ("fixbra %0,4,%1,4" : "=f" (y) : "f" (x));
+ return y;
+}
+libm_alias_ldouble (__roundeven, roundeven)
+
+#else
+# include <sysdeps/ieee754/ldbl-128/s_roundevenl.c>
+#endif