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From 429eff12541cc0779c381f84257c8860ece25b12 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 15:09:29 +0100
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Subject: [PATCH 21/28] S390: Use convert-to-fixed instruction for llrint
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functions.
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If compiled with z196 zarch support, the convert-to-fixed instruction
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is used to implement llrint, llrintf, llrintl.
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Otherwise the common-code implementation is used.
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(cherry picked from commit f10c1654fe13d797d2fd347dc47f72f93c58cf62)
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---
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sysdeps/s390/fpu/s_llrint.c | 50 +++++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_llrintf.c | 50 +++++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_llrintl.c | 51 ++++++++++++++++++++++++++++++++++++
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3 files changed, 151 insertions(+)
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create mode 100644 sysdeps/s390/fpu/s_llrint.c
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create mode 100644 sysdeps/s390/fpu/s_llrintf.c
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create mode 100644 sysdeps/s390/fpu/s_llrintl.c
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diff --git a/sysdeps/s390/fpu/s_llrint.c b/sysdeps/s390/fpu/s_llrint.c
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new file mode 100644
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index 0000000000..edd796ae8c
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_llrint.c
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@@ -0,0 +1,50 @@
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+/* llrint() - 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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+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+/* We only support s390x as on s390 a long long int refers to a register pair
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+ of two 4byte registers instead of a 8byte register which is produced by the
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+ instruction.
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+ Note: On s390 this instruction would only be used if build with -mzarch. */
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+# include <math.h>
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+# include <libm-alias-double.h>
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+
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+long long int
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+__llrint (double x)
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+{
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+ long long int y;
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+ /* The z196 zarch "convert to fixed" (cgdbra) instruction is rounding
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+ according to current rounding mode (M3-field: 0).
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+ First convert x with suppressed inexact exception and check if the
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+ resulting value is beyond the target limits (indicated by cc=3;
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+ Note: a nan is also indicated by cc=3).
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+ If the resulting value is within the target limits, redo
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+ without suppressing the inexact exception. */
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+ __asm__ ("cgdbra %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ "cgdbra %0,0,%1,0 \n\t"
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+ "1:"
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+ : "=&d" (y) : "f" (x) : "cc");
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+ return y;
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+}
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+libm_alias_double (__llrint, llrint)
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+
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+#else
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+# include <sysdeps/ieee754/dbl-64/s_llrint.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_llrintf.c b/sysdeps/s390/fpu/s_llrintf.c
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new file mode 100644
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index 0000000000..3cbe7c581a
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_llrintf.c
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@@ -0,0 +1,50 @@
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+/* llrintf() - 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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+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+/* We only support s390x as on s390 a long long int refers to a register pair
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+ of two 4byte registers instead of a 8byte register which is produced by the
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+ instruction.
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+ Note: On s390 this instruction would only be used if build with -mzarch. */
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+# include <math.h>
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+# include <libm-alias-float.h>
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+
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+long long int
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+__llrintf (float x)
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+{
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+ long long int y;
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+ /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding
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+ according to current rounding mode (M3-field: 0).
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+ First convert x with suppressed inexact exception and check if the
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+ resulting value is beyond the target limits (indicated by cc=3;
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+ Note: a nan is also indicated by cc=3).
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+ If the resulting value is within the target limits, redo
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+ without suppressing the inexact exception. */
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+ __asm__ ("cgebra %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ "cgebra %0,0,%1,0 \n\t"
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+ "1:"
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+ : "=&d" (y) : "f" (x) : "cc");
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+ return y;
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+}
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+libm_alias_float (__llrint, llrint)
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+
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+#else
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+# include <sysdeps/ieee754/flt-32/s_llrintf.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_llrintl.c b/sysdeps/s390/fpu/s_llrintl.c
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new file mode 100644
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index 0000000000..37eea5914f
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_llrintl.c
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@@ -0,0 +1,51 @@
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+/* llrintl() - 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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+#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+/* We only support s390x as on s390 a long long int refers to a register pair
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+ of two 4byte registers instead of a 8byte register which is produced by the
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+ instruction.
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+ Note: On s390 this instruction would only be used if build with -mzarch. */
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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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+long long int
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+__llrintl (_Float128 x)
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+{
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+ long long int y;
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+ /* The z196 zarch "convert to fixed" (cgxbra) instruction is rounding
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+ according to current rounding mode (M3-field: 0).
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+ First convert x with suppressed inexact exception and check if the
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+ resulting value is beyond the target limits (indicated by cc=3;
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+ Note: a nan is also indicated by cc=3).
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+ If the resulting value is within the target limits, redo
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+ without suppressing the inexact exception. */
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+ __asm__ ("cgxbra %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ "cgxbra %0,0,%1,0 \n\t"
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+ "1:"
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+ : "=&d" (y) : "f" (x) : "cc");
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+ return y;
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+}
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+libm_alias_ldouble (__llrint, llrint)
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+
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+#else
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+# include <sysdeps/ieee754/ldbl-128/s_llrintl.c>
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+#endif
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--
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2.18.2
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