| Daniel Dunbar | 0868ca6 | 2011-03-21 23:30:19 +0000 | [diff] [blame] | 1 | //===-- lib/adddf3.c - Double-precision subtraction ---------------*- C -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements double-precision soft-float subtraction with the |
| 11 | // IEEE-754 default rounding (to nearest, ties to even). |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #define DOUBLE_PRECISION |
| 16 | #include "fp_lib.h" |
| 17 | |
| Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame] | 18 | fp_t COMPILER_RT_ABI __adddf3(fp_t a, fp_t b); |
| Daniel Dunbar | 0868ca6 | 2011-03-21 23:30:19 +0000 | [diff] [blame] | 19 | |
| Anton Korobeynikov | 37b97d1 | 2011-04-19 17:51:24 +0000 | [diff] [blame] | 20 | |
| Chandler Carruth | 0193b74 | 2012-06-22 21:09:15 +0000 | [diff] [blame] | 21 | ARM_EABI_FNALIAS(dsub, subdf3) |
| Anton Korobeynikov | 37b97d1 | 2011-04-19 17:51:24 +0000 | [diff] [blame] | 22 | |
| Daniel Dunbar | 0868ca6 | 2011-03-21 23:30:19 +0000 | [diff] [blame] | 23 | // Subtraction; flip the sign bit of b and add. |
| Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame] | 24 | COMPILER_RT_ABI fp_t |
| 25 | __subdf3(fp_t a, fp_t b) { |
| Daniel Dunbar | 0868ca6 | 2011-03-21 23:30:19 +0000 | [diff] [blame] | 26 | return __adddf3(a, fromRep(toRep(b) ^ signBit)); |
| 27 | } |
| Anton Korobeynikov | 37b97d1 | 2011-04-19 17:51:24 +0000 | [diff] [blame] | 28 | |
| 29 | /* FIXME: rsub for ARM EABI */ |