diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/i386/sfp-exceptions.c')
-rw-r--r-- | gcc-4.9/libgcc/config/i386/sfp-exceptions.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/i386/sfp-exceptions.c b/gcc-4.9/libgcc/config/i386/sfp-exceptions.c new file mode 100644 index 000000000..9364a9700 --- /dev/null +++ b/gcc-4.9/libgcc/config/i386/sfp-exceptions.c @@ -0,0 +1,108 @@ +/* + * Copyright (C) 2012-2014 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 + * <http://www.gnu.org/licenses/>. + */ + +#ifndef _SOFT_FLOAT +#include "sfp-machine.h" + +struct fenv +{ + unsigned short int __control_word; + unsigned short int __unused1; + unsigned short int __status_word; + unsigned short int __unused2; + unsigned short int __tags; + unsigned short int __unused3; + unsigned int __eip; + unsigned short int __cs_selector; + unsigned int __opcode:11; + unsigned int __unused4:5; + unsigned int __data_offset; + unsigned short int __data_selector; + unsigned short int __unused5; +}; + +void +__sfp_handle_exceptions (int _fex) +{ + if (_fex & FP_EX_INVALID) + { + float f = 0.0f; +#ifdef __SSE_MATH__ + volatile float r __attribute__ ((unused)); + asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f)); + r = f; /* Needed to trigger exception. */ +#else + asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f)); + /* No need for fwait, exception is triggered by emitted fstp. */ +#endif + } + if (_fex & FP_EX_DENORM) + { + struct fenv temp; + asm volatile ("fnstenv\t%0" : "=m" (temp)); + temp.__status_word |= FP_EX_DENORM; + asm volatile ("fldenv\t%0" : : "m" (temp)); + asm volatile ("fwait"); + } + if (_fex & FP_EX_DIVZERO) + { + float f = 1.0f, g = 0.0f; +#ifdef __SSE_MATH__ + volatile float r __attribute__ ((unused)); + asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g)); + r = f; /* Needed to trigger exception. */ +#else + asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g)); + /* No need for fwait, exception is triggered by emitted fstp. */ +#endif + } + if (_fex & FP_EX_OVERFLOW) + { + struct fenv temp; + asm volatile ("fnstenv\t%0" : "=m" (temp)); + temp.__status_word |= FP_EX_OVERFLOW; + asm volatile ("fldenv\t%0" : : "m" (temp)); + asm volatile ("fwait"); + } + if (_fex & FP_EX_UNDERFLOW) + { + struct fenv temp; + asm volatile ("fnstenv\t%0" : "=m" (temp)); + temp.__status_word |= FP_EX_UNDERFLOW; + asm volatile ("fldenv\t%0" : : "m" (temp)); + asm volatile ("fwait"); + } + if (_fex & FP_EX_INEXACT) + { + float f = 1.0f, g = 3.0f; +#ifdef __SSE_MATH__ + volatile float r __attribute__ ((unused)); + asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g)); + r = f; /* Needed to trigger exception. */ +#else + asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g)); + /* No need for fwait, exception is triggered by emitted fstp. */ +#endif + } +}; +#endif |