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author | ed <ed@FreeBSD.org> | 2010-11-11 15:13:11 +0000 |
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committer | ed <ed@FreeBSD.org> | 2010-11-11 15:13:11 +0000 |
commit | 870837e3e92f721a44db51308f2b900d928fb04f (patch) | |
tree | 9f851f7f6da4a4d9010d26bf17881d3bc5320f2b /contrib/compiler-rt/lib/fixsfti.c | |
parent | a1b6fa69a6f674978270e402b8bba6552e152066 (diff) | |
parent | 653bb6745595746d04ad4acacaaab66caaaeb69b (diff) | |
download | FreeBSD-src-870837e3e92f721a44db51308f2b900d928fb04f.zip FreeBSD-src-870837e3e92f721a44db51308f2b900d928fb04f.tar.gz |
Import libcompiler_rt into HEAD and add Makefiles.
Obtained from: user/ed/compiler-rt
Diffstat (limited to 'contrib/compiler-rt/lib/fixsfti.c')
-rw-r--r-- | contrib/compiler-rt/lib/fixsfti.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/fixsfti.c b/contrib/compiler-rt/lib/fixsfti.c new file mode 100644 index 0000000..95992fe --- /dev/null +++ b/contrib/compiler-rt/lib/fixsfti.c @@ -0,0 +1,45 @@ +/* ===-- fixsfti.c - Implement __fixsfti -----------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __fixsfti for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#if __x86_64 + +#include "int_lib.h" + +/* Returns: convert a to a signed long long, rounding toward zero. */ + +/* Assumption: float is a IEEE 32 bit floating point type + * su_int is a 32 bit integral type + * value in float is representable in ti_int (no range checking performed) + */ + +/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ + +ti_int +__fixsfti(float a) +{ + float_bits fb; + fb.f = a; + int e = ((fb.u & 0x7F800000) >> 23) - 127; + if (e < 0) + return 0; + ti_int s = (si_int)(fb.u & 0x80000000) >> 31; + ti_int r = (fb.u & 0x007FFFFF) | 0x00800000; + if (e > 23) + r <<= (e - 23); + else + r >>= (23 - e); + return (r ^ s) - s; +} + +#endif |