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/fsetexcptflg.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 libm/x86_64/fsetexcptflg.c (limited to 'libm/x86_64/fsetexcptflg.c') diff --git a/libm/x86_64/fsetexcptflg.c b/libm/x86_64/fsetexcptflg.c new file mode 100644 index 000000000..b3f001b7c --- /dev/null +++ b/libm/x86_64/fsetexcptflg.c @@ -0,0 +1,52 @@ +/* Set floating-point environment exception handling. + Copyright (C) 2001-2017 Free Software Foundation, Inc. + + 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 +#include + +int +fesetexceptflag (const fexcept_t *flagp, int excepts) +{ + fenv_t temp; + unsigned int mxcsr; + + /* XXX: Do we really need to set both the exception in both units? + Shouldn't it be enough to set only the SSE unit? */ + + /* Get the current x87 FPU environment. We have to do this since we + cannot separately set the status word. */ + __asm__ ("fnstenv %0" : "=m" (*&temp)); + + temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); + temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; + + /* Store the new status word (along with the rest of the environment. + Possibly new exceptions are set but they won't get executed unless + the next floating-point instruction. */ + __asm__ ("fldenv %0" : : "m" (*&temp)); + + /* And now the same for SSE. */ + __asm__ ("stmxcsr %0" : "=m" (*&mxcsr)); + + mxcsr &= ~(excepts & FE_ALL_EXCEPT); + mxcsr |= *flagp & excepts & FE_ALL_EXCEPT; + + __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr)); + + /* Success. */ + return 0; +} -- cgit v1.2.3