From edce88cfef2f2a62647c2ab9536ca29694fab292 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Sun, 3 Dec 2017 21:12:34 +0100 Subject: x86_64: add fenv support from glibc --- libm/x86_64/fegetround.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 libm/x86_64/fegetround.c (limited to 'libm/x86_64/fegetround.c') diff --git a/libm/x86_64/fegetround.c b/libm/x86_64/fegetround.c new file mode 100644 index 000000000..d0ca106e9 --- /dev/null +++ b/libm/x86_64/fegetround.c @@ -0,0 +1,31 @@ +/* Return current rounding direction. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + Contributed by Ulrich Drepper , 1997. + + 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 + . */ + +#include + +int +fegetround (void) +{ + int cw; + /* We only check the x87 FPU unit. The SSE unit should be the same + - and if it's not the same there's no way to signal it. */ + + __asm__ ("fnstcw %0" : "=m" (*&cw)); + + return cw & 0xc00; +} -- cgit v1.2.3