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Diffstat (limited to 'contrib/compiler-rt/lib/fixunsdfsi.c')
-rw-r--r-- | contrib/compiler-rt/lib/fixunsdfsi.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/fixunsdfsi.c b/contrib/compiler-rt/lib/fixunsdfsi.c new file mode 100644 index 000000000000..c6a3c755e90f --- /dev/null +++ b/contrib/compiler-rt/lib/fixunsdfsi.c @@ -0,0 +1,44 @@ +/* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __fixunsdfsi for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +/* Returns: convert a to a unsigned int, rounding toward zero. + * Negative values all become zero. + */ + +/* Assumption: double is a IEEE 64 bit floating point type + * su_int is a 32 bit integral type + * value in double is representable in su_int or is negative + * (no range checking performed) + */ + +/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ + +ARM_EABI_FNALIAS(d2uiz, fixunsdfsi) + +COMPILER_RT_ABI su_int +__fixunsdfsi(double a) +{ + double_bits fb; + fb.f = a; + int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; + if (e < 0 || (fb.u.s.high & 0x80000000)) + return 0; + return ( + 0x80000000u | + ((fb.u.s.high & 0x000FFFFF) << 11) | + (fb.u.s.low >> 21) + ) >> (31 - e); +} |