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Diffstat (limited to 'contrib/compiler-rt/lib/fixunssfdi.c')
-rw-r--r-- | contrib/compiler-rt/lib/fixunssfdi.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/fixunssfdi.c b/contrib/compiler-rt/lib/fixunssfdi.c new file mode 100644 index 0000000..3837bd8 --- /dev/null +++ b/contrib/compiler-rt/lib/fixunssfdi.c @@ -0,0 +1,43 @@ +/* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __fixunssfdi for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +/* Returns: convert a to a unsigned long long, rounding toward zero. + * Negative values all become zero. + */ + +/* Assumption: float is a IEEE 32 bit floating point type + * du_int is a 64 bit integral type + * value in float is representable in du_int or is negative + * (no range checking performed) + */ + +/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ + +du_int +__fixunssfdi(float a) +{ + float_bits fb; + fb.f = a; + int e = ((fb.u & 0x7F800000) >> 23) - 127; + if (e < 0 || (fb.u & 0x80000000)) + return 0; + du_int r = (fb.u & 0x007FFFFF) | 0x00800000; + if (e > 23) + r <<= (e - 23); + else + r >>= (23 - e); + return r; +} |