From 9d9f3527daf65fdca0eb46eaa324b81b8f94d88c Mon Sep 17 00:00:00 2001 From: Stefan Liebler Date: Wed, 11 Dec 2019 15:09:30 +0100 Subject: [PATCH] S390: Use convert-to-fixed instruction for lround functions. If compiled with z196 zarch support, the convert-to-fixed instruction is used to implement lround, lroundf, lroundl. Otherwise the common-code implementation is used. --- sysdeps/s390/fpu/s_lround.c | 47 +++++++++++++++++++++++++++++++++++ sysdeps/s390/fpu/s_lroundf.c | 47 +++++++++++++++++++++++++++++++++++ sysdeps/s390/fpu/s_lroundl.c | 48 ++++++++++++++++++++++++++++++++++++ 3 files changed, 142 insertions(+) create mode 100644 sysdeps/s390/fpu/s_lround.c create mode 100644 sysdeps/s390/fpu/s_lroundf.c create mode 100644 sysdeps/s390/fpu/s_lroundl.c diff --git a/sysdeps/s390/fpu/s_lround.c b/sysdeps/s390/fpu/s_lround.c new file mode 100644 index 0000000000..9290ec32cd --- /dev/null +++ b/sysdeps/s390/fpu/s_lround.c @@ -0,0 +1,47 @@ +/* lround() - 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 + . */ + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# include +# include + +/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte). + Thus we need different instructions as the target size is encoded there. + Note: On s390 this instruction is only used if build with -mzarch. */ +# ifdef __s390x__ +# define INSN "cgdbra" +# else +# define INSN "cfdbra" +# endif + +long int +__lround (double x) +{ + long int y; + /* The z196 zarch "convert to fixed" (cgdbra) instruction is rounding + x to the nearest integer with "ties away from 0" rounding mode + (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ (INSN " %0,1,%1,4" : "=d" (y) : "f" (x) : "cc"); + return y; +} +libm_alias_double (__lround, lround) + +#else +# include +#endif diff --git a/sysdeps/s390/fpu/s_lroundf.c b/sysdeps/s390/fpu/s_lroundf.c new file mode 100644 index 0000000000..097b924c91 --- /dev/null +++ b/sysdeps/s390/fpu/s_lroundf.c @@ -0,0 +1,47 @@ +/* lroundf() - 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 + . */ + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# include +# include + +/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte). + Thus we need different instructions as the target size is encoded there. + Note: On s390 this instruction is only used if build with -mzarch. */ +# ifdef __s390x__ +# define INSN "cgebra" +# else +# define INSN "cfebra" +# endif + +long int +__lroundf (float x) +{ + long int y; + /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding + x to the nearest integer with "ties away from 0" rounding mode + (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ (INSN " %0,1,%1,4" : "=d" (y) : "f" (x) : "cc"); + return y; +} +libm_alias_float (__lround, lround) + +#else +# include +#endif diff --git a/sysdeps/s390/fpu/s_lroundl.c b/sysdeps/s390/fpu/s_lroundl.c new file mode 100644 index 0000000000..0ef77dc667 --- /dev/null +++ b/sysdeps/s390/fpu/s_lroundl.c @@ -0,0 +1,48 @@ +/* lroundl() - 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 + . */ + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# include +# include +# include + +/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte). + Thus we need different instructions as the target size is encoded there. + Note: On s390 this instruction is only used if build with -mzarch. */ +# ifdef __s390x__ +# define INSN "cgxbra" +# else +# define INSN "cfxbra" +# endif + +long int +__lroundl (_Float128 x) +{ + long int y; + /* The z196 zarch "convert to fixed" (cgxbra) instruction is rounding + x to the nearest integer with "ties away from 0" rounding mode + (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ (INSN " %0,1,%1,4" : "=d" (y) : "f" (x) : "cc"); + return y; +} +libm_alias_ldouble (__lround, lround) + +#else +# include +#endif -- 2.43.5