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Diffstat (limited to 'lib/fixxfdi.c')
-rw-r--r-- | lib/fixxfdi.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/fixxfdi.c b/lib/fixxfdi.c new file mode 100644 index 000000000..2a7d20814 --- /dev/null +++ b/lib/fixxfdi.c @@ -0,0 +1,41 @@ +//===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __fixxfdi for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if !_ARCH_PPC + +#include "int_lib.h" + +// Returns: convert a to a signed long long, rounding toward zero. + +// Assumption: long double is an intel 80 bit floating point type padded with 6 bytes +// su_int is a 32 bit integral type +// value in long double is representable in di_int (no range checking performed) + +// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | +// 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm + +di_int +__fixxfdi(long double a) +{ + long_double_bits fb; + fb.f = a; + int e = (fb.u.high.low & 0x00007FFF) - 16383; + if (e < 0) + return 0; + di_int s = -(si_int)((fb.u.high.low & 0x00008000) >> 15); + di_int r = fb.u.low.all; + r = (du_int)r >> (63 - e); + return (r ^ s) - s; +} + +#endif |