From: Stefan Liebler <stli@linux.ibm.com>
To: libc-alpha@sourceware.org
Cc: Stefan Liebler <stli@linux.ibm.com>
Subject: [PATCH 09/17] S390: Use convert-to-fixed instruction for llrint functions.
Date: Mon, 04 Nov 2019 16:28:00 -0000 [thread overview]
Message-ID: <1572881244-6781-9-git-send-email-stli@linux.ibm.com> (raw)
In-Reply-To: <1572881244-6781-1-git-send-email-stli@linux.ibm.com>
If compiled with z196 zarch support, the convert-to-fixed instruction
is used to implement llrint, llrintf, llrintl.
Otherwise the common-code implementation is used.
---
sysdeps/s390/fpu/s_llrint.c | 50 +++++++++++++++++++++++++++++++++++
sysdeps/s390/fpu/s_llrintf.c | 50 +++++++++++++++++++++++++++++++++++
sysdeps/s390/fpu/s_llrintl.c | 51 ++++++++++++++++++++++++++++++++++++
3 files changed, 151 insertions(+)
create mode 100644 sysdeps/s390/fpu/s_llrint.c
create mode 100644 sysdeps/s390/fpu/s_llrintf.c
create mode 100644 sysdeps/s390/fpu/s_llrintl.c
diff --git a/sysdeps/s390/fpu/s_llrint.c b/sysdeps/s390/fpu/s_llrint.c
new file mode 100644
index 0000000000..edd796ae8c
--- /dev/null
+++ b/sysdeps/s390/fpu/s_llrint.c
@@ -0,0 +1,50 @@
+/* llrint() - 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/>. */
+
+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+/* We only support s390x as on s390 a long long int refers to a register pair
+ of two 4byte registers instead of a 8byte register which is produced by the
+ instruction.
+ Note: On s390 this instruction would only be used if build with -mzarch. */
+# include <math.h>
+# include <libm-alias-double.h>
+
+long long int
+__llrint (double x)
+{
+ long long int y;
+ /* The z196 zarch "convert to fixed" (cgdbra) instruction is rounding
+ according to current rounding mode (M3-field: 0).
+ First convert x with suppressed inexact exception and check if the
+ resulting value is beyond the target limits (indicated by cc=3;
+ Note: a nan is also indicated by cc=3).
+ If the resulting value is within the target limits, redo
+ without suppressing the inexact exception. */
+ __asm__ ("cgdbra %0,0,%1,4 \n\t"
+ "jo 1f \n\t"
+ "cgdbra %0,0,%1,0 \n\t"
+ "1:"
+ : "=&d" (y) : "f" (x) : "cc");
+ return y;
+}
+libm_alias_double (__llrint, llrint)
+
+#else
+# include <sysdeps/ieee754/dbl-64/s_llrint.c>
+#endif
diff --git a/sysdeps/s390/fpu/s_llrintf.c b/sysdeps/s390/fpu/s_llrintf.c
new file mode 100644
index 0000000000..3cbe7c581a
--- /dev/null
+++ b/sysdeps/s390/fpu/s_llrintf.c
@@ -0,0 +1,50 @@
+/* llrintf() - 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/>. */
+
+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+/* We only support s390x as on s390 a long long int refers to a register pair
+ of two 4byte registers instead of a 8byte register which is produced by the
+ instruction.
+ Note: On s390 this instruction would only be used if build with -mzarch. */
+# include <math.h>
+# include <libm-alias-float.h>
+
+long long int
+__llrintf (float x)
+{
+ long long int y;
+ /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding
+ according to current rounding mode (M3-field: 0).
+ First convert x with suppressed inexact exception and check if the
+ resulting value is beyond the target limits (indicated by cc=3;
+ Note: a nan is also indicated by cc=3).
+ If the resulting value is within the target limits, redo
+ without suppressing the inexact exception. */
+ __asm__ ("cgebra %0,0,%1,4 \n\t"
+ "jo 1f \n\t"
+ "cgebra %0,0,%1,0 \n\t"
+ "1:"
+ : "=&d" (y) : "f" (x) : "cc");
+ return y;
+}
+libm_alias_float (__llrint, llrint)
+
+#else
+# include <sysdeps/ieee754/flt-32/s_llrintf.c>
+#endif
diff --git a/sysdeps/s390/fpu/s_llrintl.c b/sysdeps/s390/fpu/s_llrintl.c
new file mode 100644
index 0000000000..37eea5914f
--- /dev/null
+++ b/sysdeps/s390/fpu/s_llrintl.c
@@ -0,0 +1,51 @@
+/* llrintl() - 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/>. */
+
+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
+/* We only support s390x as on s390 a long long int refers to a register pair
+ of two 4byte registers instead of a 8byte register which is produced by the
+ instruction.
+ Note: On s390 this instruction would only be used if build with -mzarch. */
+# include <math.h>
+# include <math_private.h>
+# include <libm-alias-ldouble.h>
+
+long long int
+__llrintl (_Float128 x)
+{
+ long long int y;
+ /* The z196 zarch "convert to fixed" (cgxbra) instruction is rounding
+ according to current rounding mode (M3-field: 0).
+ First convert x with suppressed inexact exception and check if the
+ resulting value is beyond the target limits (indicated by cc=3;
+ Note: a nan is also indicated by cc=3).
+ If the resulting value is within the target limits, redo
+ without suppressing the inexact exception. */
+ __asm__ ("cgxbra %0,0,%1,4 \n\t"
+ "jo 1f \n\t"
+ "cgxbra %0,0,%1,0 \n\t"
+ "1:"
+ : "=&d" (y) : "f" (x) : "cc");
+ return y;
+}
+libm_alias_ldouble (__llrint, llrint)
+
+#else
+# include <sysdeps/ieee754/ldbl-128/s_llrintl.c>
+#endif
--
2.19.1
next prev parent reply other threads:[~2019-11-04 16:28 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 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 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 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 13/17] S390: Implement libc_fe* macros Stefan Liebler
2019-12-02 14:58 ` 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 10/17] S390: Use convert-to-fixed instruction for lround functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:49 ` [PATCH 16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS Stefan Liebler
2019-12-02 14:57 ` 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 ` Stefan Liebler [this message]
2019-12-02 14:57 ` [PATCH 09/17] S390: Use convert-to-fixed instruction for llrint functions 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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