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From 90e84ac5ac8e774ce0cfd3abc5f7d8834efd2c9b 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 20/28] S390: Use convert-to-fixed instruction for lrint
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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 lrint, lrintf, lrintl.
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Otherwise the common-code implementation is used.
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(cherry picked from commit e3f07622209c1b4436ef364b134dfd2cd4ca9976)
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---
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sysdeps/s390/fpu/s_lrint.c | 55 ++++++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_lrintf.c | 55 ++++++++++++++++++++++++++++++++++++
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sysdeps/s390/fpu/s_lrintl.c | 56 +++++++++++++++++++++++++++++++++++++
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3 files changed, 166 insertions(+)
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create mode 100644 sysdeps/s390/fpu/s_lrint.c
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create mode 100644 sysdeps/s390/fpu/s_lrintf.c
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create mode 100644 sysdeps/s390/fpu/s_lrintl.c
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diff --git a/sysdeps/s390/fpu/s_lrint.c b/sysdeps/s390/fpu/s_lrint.c
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new file mode 100644
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index 0000000000..7be60665b5
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_lrint.c
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@@ -0,0 +1,55 @@
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+/* lrint() - 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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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+# include <math.h>
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+# include <libm-alias-double.h>
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+
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+/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte).
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+ Thus we need different instructions as the target size is encoded there.
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+ Note: On s390 this instruction is only used if build with -mzarch. */
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+# ifdef __s390x__
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+# define INSN "cgdbra"
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+# else
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+# define INSN "cfdbra"
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+# endif
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+
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+long int
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+__lrint (double x)
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+{
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+ 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__ (INSN " %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ INSN " %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 (__lrint, lrint)
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+
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+#else
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+# include <sysdeps/ieee754/dbl-64/s_lrint.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_lrintf.c b/sysdeps/s390/fpu/s_lrintf.c
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new file mode 100644
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index 0000000000..d6a2a4081a
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_lrintf.c
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@@ -0,0 +1,55 @@
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+/* lrintf() - 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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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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+# include <math.h>
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+# include <libm-alias-float.h>
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+
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+/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte).
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+ Thus we need different instructions as the target size is encoded there.
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+ Note: On s390 this instruction is only used if build with -mzarch. */
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+# ifdef __s390x__
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+# define INSN "cgebra"
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+# else
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+# define INSN "cfebra"
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+# endif
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+
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+long int
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+__lrintf (float x)
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+{
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+ 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__ (INSN " %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ INSN " %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 (__lrint, lrint)
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+
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+#else
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+# include <sysdeps/ieee754/flt-32/s_lrintf.c>
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+#endif
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diff --git a/sysdeps/s390/fpu/s_lrintl.c b/sysdeps/s390/fpu/s_lrintl.c
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new file mode 100644
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index 0000000000..2d386ecff9
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--- /dev/null
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+++ b/sysdeps/s390/fpu/s_lrintl.c
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@@ -0,0 +1,56 @@
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+/* lrintl() - 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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+#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
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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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+/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte).
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+ Thus we need different instructions as the target size is encoded there.
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+ Note: On s390 this instruction is only used if build with -mzarch. */
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+# ifdef __s390x__
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+# define INSN "cgxbra"
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+# else
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+# define INSN "cfxbra"
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+# endif
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+
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+long int
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+__lrintl (_Float128 x)
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+{
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+ 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__ (INSN " %0,0,%1,4 \n\t"
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+ "jo 1f \n\t"
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+ INSN " %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 (__lrint, lrint)
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+
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+#else
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+# include <sysdeps/ieee754/ldbl-128/s_lrintl.c>
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+#endif
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--
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2.18.2
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