Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 1 | /* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame] | 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __fixunssfdi for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 14 | |
| 15 | #include "int_lib.h" |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 16 | /* Returns: convert a to a unsigned long long, rounding toward zero. |
| 17 | * Negative values all become zero. |
| 18 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 19 | |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 20 | /* Assumption: float is a IEEE 32 bit floating point type |
| 21 | * du_int is a 64 bit integral type |
| 22 | * value in float is representable in du_int or is negative |
| 23 | * (no range checking performed) |
| 24 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 25 | |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 26 | /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 27 | |
Chandler Carruth | 0193b74 | 2012-06-22 21:09:15 +0000 | [diff] [blame^] | 28 | ARM_EABI_FNALIAS(f2ulz, fixunssfdi) |
Anton Korobeynikov | 37b97d1 | 2011-04-19 17:51:24 +0000 | [diff] [blame] | 29 | |
Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame] | 30 | COMPILER_RT_ABI du_int |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 31 | __fixunssfdi(float a) |
| 32 | { |
| 33 | float_bits fb; |
| 34 | fb.f = a; |
| 35 | int e = ((fb.u & 0x7F800000) >> 23) - 127; |
| 36 | if (e < 0 || (fb.u & 0x80000000)) |
| 37 | return 0; |
| 38 | du_int r = (fb.u & 0x007FFFFF) | 0x00800000; |
| 39 | if (e > 23) |
| 40 | r <<= (e - 23); |
| 41 | else |
| 42 | r >>= (23 - e); |
| 43 | return r; |
| 44 | } |