diff options
Diffstat (limited to 'sysdeps/s390/fpu/s_lroundf.c')
-rw-r--r-- | sysdeps/s390/fpu/s_lroundf.c | 47 |
1 files changed, 47 insertions, 0 deletions
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 + <https://www.gnu.org/licenses/>. */ + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# include <math.h> +# include <libm-alias-float.h> + +/* 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 <sysdeps/ieee754/flt-32/s_lroundf.c> +#endif |