From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/config/i386/crtprec.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 gcc/config/i386/crtprec.c (limited to 'gcc/config/i386/crtprec.c') diff --git a/gcc/config/i386/crtprec.c b/gcc/config/i386/crtprec.c new file mode 100644 index 000000000..4f42a8fa1 --- /dev/null +++ b/gcc/config/i386/crtprec.c @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2007, 2009 Free Software Foundation, Inc. + * + * This file is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 3, or (at your option) any + * later version. + * + * This file 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 + * General Public License for more details. + * + * Under Section 7 of GPL version 3, you are granted additional + * permissions described in the GCC Runtime Library Exception, version + * 3.1, as published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License and + * a copy of the GCC Runtime Library Exception along with this program; + * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + * . + */ + +#if __PREC == 32 + #define X87CW (0 << 8) /* Single precision (24 bits) */ +#elif __PREC == 64 + #define X87CW (2 << 8) /* Double precision (53 bits) */ +#elif __PREC == 80 + #define X87CW (3 << 8) /* Extended precision (64 bits) */ +#else + #error "Wrong precision requested." +#endif + +#define X87CW_PCMASK (3 << 8) + +static void __attribute__((constructor)) +set_precision (void) +{ + unsigned short int cwd; + + asm volatile ("fstcw\t%0" : "=m" (cwd)); + + cwd &= ~X87CW_PCMASK; + cwd |= X87CW; + + asm volatile ("fldcw\t%0" : : "m" (cwd)); +} -- cgit v1.2.3