| /* ===-- fixsfdi.c - Implement __fixsfdi -----------------------------------=== |
| * |
| * The LLVM Compiler Infrastructure |
| * |
| * This file is distributed under the University of Illinois Open Source |
| * License. See LICENSE.TXT for details. |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file implements __fixsfdi for the compiler_rt library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #if !defined(__GNUC__) || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) || defined(ARCH_X86) |
| // ARM gcc >= 4.7 implements this in libgcc |
| #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 di_int (no range checking performed) |
| */ |
| |
| /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ |
| |
| di_int |
| __fixsfdi(float a) |
| { |
| float_bits fb; |
| fb.f = a; |
| int e = ((fb.u & 0x7F800000) >> 23) - 127; |
| if (e < 0) |
| return 0; |
| di_int s = (si_int)(fb.u & 0x80000000) >> 31; |
| di_int r = (fb.u & 0x007FFFFF) | 0x00800000; |
| if (e > 23) |
| r <<= (e - 23); |
| else |
| r >>= (23 - e); |
| return (r ^ s) - s; |
| } |
| #endif |
