| /* ===-- fixunssfti.c - Implement __fixunssfti -----------------------------=== |
| * |
| * The LLVM Compiler Infrastructure |
| * |
| * This file is distributed under the University of Illinois Open Source |
| * License. See LICENSE.TXT for details. |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file implements __fixunssfti for the compiler_rt library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #if __x86_64 |
| |
| #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 |
| * tu_int is a 64 bit integral type |
| * value in float is representable in tu_int or is negative |
| * (no range checking performed) |
| */ |
| |
| /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ |
| |
| tu_int |
| __fixunssfti(float a) |
| { |
| float_bits fb; |
| fb.f = a; |
| int e = ((fb.u & 0x7F800000) >> 23) - 127; |
| if (e < 0 || (fb.u & 0x80000000)) |
| return 0; |
| tu_int r = (fb.u & 0x007FFFFF) | 0x00800000; |
| if (e > 23) |
| r <<= (e - 23); |
| else |
| r >>= (23 - e); |
| return r; |
| } |
| |
| #endif |