| //===-- 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 |