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From: Stefan Liebler <stli@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS. Date: Wed, 11 Dec 2019 14:17:00 -0000 [thread overview] Message-ID: <20191211141739.64834.qmail@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2763d3145a326aa9afa613fe9e1b444cf912a883 commit 2763d3145a326aa9afa613fe9e1b444cf912a883 Author: Stefan Liebler <stli@linux.ibm.com> Date: Wed Dec 11 15:09:33 2019 +0100 S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS. This patch implements roundtoint and convertoint for s390 by using the load-fp-integer and convert-to-fixed instructions. Both functions are using "round to nearest with ties away from zero" rounding mode and do not raise inexact exceptions. Diff: --- sysdeps/s390/fpu/math_private.h | 53 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/sysdeps/s390/fpu/math_private.h b/sysdeps/s390/fpu/math_private.h new file mode 100644 index 0000000..a1ae91a --- /dev/null +++ b/sysdeps/s390/fpu/math_private.h @@ -0,0 +1,53 @@ +/* Configure optimized libm functions. 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/>. */ + +#ifndef S390_MATH_PRIVATE_H +#define S390_MATH_PRIVATE_H 1 + +#include <stdint.h> +#include <math.h> + +#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT +# define TOINT_INTRINSICS 1 + +static inline double_t +roundtoint (double_t x) +{ + double_t y; + /* The z196 zarch "load fp integer" (fidbra) instruction is rounding + x to the nearest integer with ties away from zero (M3-field: 1) + where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ ("fidbra %0,1,%1,4" : "=f" (y) : "f" (x)); + return y; +} + +static inline int32_t +converttoint (double_t x) +{ + int32_t y; + /* The z196 zarch "convert to fixed" (cfdbra) instruction is rounding + x to the nearest integer with ties away from zero (M3-field: 1) + where inexact exceptions are suppressed (M4-field: 4). */ + __asm__ ("cfdbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc"); + return y; +} +#endif + +#include_next <math_private.h> + +#endif
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