[16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS.
Commit Message
This patch implements roundtoint and convertoint for s390
by using the load-fp-integer and convert-to-fixed instructions.
Both functions are using "round to nearest with ties away from zero"
rounding mode and do not raise inexact exceptions.
---
sysdeps/s390/fpu/math_private.h | 53 +++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
create mode 100644 sysdeps/s390/fpu/math_private.h
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
new file mode 100644
@@ -0,0 +1,53 @@
+/* Configure optimized libm functions. 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/>. */
+
+#ifndef S390_MATH_PRIVATE_H
+#define S390_MATH_PRIVATE_H 1
+
+#include <stdint.h>
+#include <math.h>
+
+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+# define TOINT_INTRINSICS 1
+
+static inline double_t
+roundtoint (double_t x)
+{
+ double_t y;
+ /* The z196 zarch "load fp integer" (fidbra) instruction is rounding
+ x to the nearest integer with ties away from zero (M3-field: 1)
+ where inexact exceptions are suppressed (M4-field: 4). */
+ __asm__ ("fidbra %0,1,%1,4" : "=f" (y) : "f" (x));
+ return y;
+}
+
+static inline int32_t
+converttoint (double_t x)
+{
+ int32_t y;
+ /* The z196 zarch "convert to fixed" (cfdbra) instruction is rounding
+ x to the nearest integer with ties away from zero (M3-field: 1)
+ where inexact exceptions are suppressed (M4-field: 4). */
+ __asm__ ("cfdbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc");
+ return y;
+}
+#endif
+
+#include_next <math_private.h>
+
+#endif