diff options
author | Daniel Dunbar <daniel@zuster.org> | 2009-06-26 16:47:03 +0000 |
---|---|---|
committer | Daniel Dunbar <daniel@zuster.org> | 2009-06-26 16:47:03 +0000 |
commit | b3a6901e66f55b35aa9e01bcb24134e6a65ea004 (patch) | |
tree | 4d57d73575ea3f7e30bf430920d6e96fa2a369c1 /lib/fixxfti.c | |
parent | 8cbe163cba77c772621f89ddb33793ac170b1fa2 (diff) | |
download | compiler-rt-b3a6901e66f55b35aa9e01bcb24134e6a65ea004.tar.gz |
Initial import of compiler-rt.
-
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/fixxfti.c')
-rw-r--r-- | lib/fixxfti.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/fixxfti.c b/lib/fixxfti.c new file mode 100644 index 000000000..d9cb3eaf0 --- /dev/null +++ b/lib/fixxfti.c @@ -0,0 +1,44 @@ +//===-- fixxfti.c - Implement __fixxfti -----------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __fixxfti for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if __x86_64 + +#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 ti_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 + +ti_int +__fixxfti(long double a) +{ + long_double_bits fb; + fb.f = a; + int e = (fb.u.high.low & 0x00007FFF) - 16383; + if (e < 0) + return 0; + ti_int s = -(si_int)((fb.u.high.low & 0x00008000) >> 15); + ti_int r = fb.u.low.all; + if (e > 63) + r <<= (e - 63); + else + r >>= (63 - e); + return (r ^ s) - s; +} + +#endif |