From: Stefan Liebler <stli@linux.ibm.com>
To: libc-alpha@sourceware.org
Cc: Stefan Liebler <stli@linux.ibm.com>
Subject: [PATCH 16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS.
Date: Mon, 04 Nov 2019 15:49:00 -0000 [thread overview]
Message-ID: <1572881244-6781-16-git-send-email-stli@linux.ibm.com> (raw)
In-Reply-To: <1572881244-6781-1-git-send-email-stli@linux.ibm.com>
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
diff --git a/sysdeps/s390/fpu/math_private.h b/sysdeps/s390/fpu/math_private.h
new file mode 100644
index 0000000000..a1ae91a87c
--- /dev/null
+++ b/sysdeps/s390/fpu/math_private.h
@@ -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
--
2.19.1
next prev parent reply other threads:[~2019-11-04 15:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 15:28 [PATCH 01/17] S390: Use load-fp-integer instruction for nearbyint functions Stefan Liebler
2019-11-04 15:28 ` [PATCH 06/17] S390: Use load-fp-integer instruction for round functions Stefan Liebler
2019-12-02 14:58 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 03/17] S390: Use load-fp-integer instruction for floor functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 05/17] S390: Use load-fp-integer instruction for trunc functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 12/17] S390: Use copy-sign instruction for copysign functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 07/17] S390: Use load-fp-integer instruction for roundeven functions Stefan Liebler
2019-12-02 15:04 ` Stefan Liebler
2019-12-11 14:18 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 08/17] S390: Use convert-to-fixed instruction for lrint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 10/17] S390: Use convert-to-fixed instruction for lround functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 15/17] S390: Implement math-barriers math_opt_barrier and math_force_eval Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 04/17] S390: Use load-fp-integer instruction for ceil functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 17/17] S390: Use sysdeps/ieee754/dbl-64/wordsize-64 on s390x Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 13/17] S390: Implement libc_fe* macros Stefan Liebler
2019-12-02 14:58 ` Stefan Liebler
2019-11-04 15:49 ` Stefan Liebler [this message]
2019-12-02 14:57 ` [PATCH 16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS Stefan Liebler
2019-11-04 15:54 ` [PATCH 02/17] S390: Use load-fp-integer instruction for rint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 16:04 ` [PATCH 14/17] S390: Use libc_fe* macros in fe* functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 16:27 ` [PATCH 11/17] S390: Use convert-to-fixed instruction for llround functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 16:28 ` [PATCH 09/17] S390: Use convert-to-fixed instruction for llrint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 18:22 ` [PATCH 01/17] S390: Use load-fp-integer instruction for nearbyint functions Adhemerval Zanella
2019-11-05 15:49 ` Stefan Liebler
2019-11-05 16:48 ` Joseph Myers
2019-11-05 18:55 ` Adhemerval Zanella
2019-12-02 14:56 ` Stefan Liebler
2019-12-02 15:20 ` Adhemerval Zanella
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