Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 1 | /* ===-- fixunsdfdi.c - Implement __fixunsdfdi -----------------------------=== |
| 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 __fixunsdfdi for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame^] | 14 | #include "abi.h" |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 15 | |
| 16 | #include "int_lib.h" |
| 17 | |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 18 | /* Returns: convert a to a unsigned long long, rounding toward zero. |
| 19 | * Negative values all become zero. |
| 20 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 21 | |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 22 | /* Assumption: double is a IEEE 64 bit floating point type |
| 23 | * du_int is a 64 bit integral type |
| 24 | * value in double is representable in du_int or is negative |
| 25 | * (no range checking performed) |
| 26 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 27 | |
Edward O'Callaghan | 2bf6272 | 2009-08-05 04:02:56 +0000 | [diff] [blame] | 28 | /* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 29 | |
Anton Korobeynikov | 37b97d1 | 2011-04-19 17:51:24 +0000 | [diff] [blame] | 30 | ARM_EABI_FNALIAS(d2ulz, fixunsdfdi); |
| 31 | |
Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame^] | 32 | COMPILER_RT_ABI du_int |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 33 | __fixunsdfdi(double a) |
| 34 | { |
| 35 | double_bits fb; |
| 36 | fb.f = a; |
Edward O'Callaghan | 8bf1e09 | 2009-08-09 18:41:02 +0000 | [diff] [blame] | 37 | int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; |
| 38 | if (e < 0 || (fb.u.s.high & 0x80000000)) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 39 | return 0; |
| 40 | udwords r; |
Edward O'Callaghan | 8bf1e09 | 2009-08-09 18:41:02 +0000 | [diff] [blame] | 41 | r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000; |
| 42 | r.s.low = fb.u.s.low; |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 43 | if (e > 52) |
| 44 | r.all <<= (e - 52); |
| 45 | else |
| 46 | r.all >>= (52 - e); |
| 47 | return r.all; |
| 48 | } |