diff options
Diffstat (limited to 'lib/libc/arm/gen/flt_rounds.c')
-rw-r--r-- | lib/libc/arm/gen/flt_rounds.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/lib/libc/arm/gen/flt_rounds.c b/lib/libc/arm/gen/flt_rounds.c new file mode 100644 index 000000000000..86509d233231 --- /dev/null +++ b/lib/libc/arm/gen/flt_rounds.c @@ -0,0 +1,69 @@ +/*- + * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <fenv.h> +#include <float.h> + +#ifndef __ARM_PCS_VFP +#include "softfloat-for-gcc.h" +#include "milieu.h" +#include "softfloat.h" +#endif + +int +__flt_rounds(void) +{ + int mode; + +#ifndef __ARM_PCS_VFP + /* + * Translate our rounding modes to the unnamed + * manifest constants required by C99 et. al. + */ + mode = __softfloat_float_rounding_mode; +#else /* __ARM_PCS_VFP */ + /* + * Read the floating-point status and control register + */ + __asm __volatile("vmrs %0, fpscr" : "=&r"(mode)); + mode &= _ROUND_MASK; +#endif /* __ARM_PCS_VFP */ + + switch (mode) { + case FE_TOWARDZERO: + return (0); + case FE_TONEAREST: + return (1); + case FE_UPWARD: + return (2); + case FE_DOWNWARD: + return (3); + } + return (-1); +} |