| Joerg Sonnenberger | 361519f | 2014-06-19 20:24:49 +0000 | [diff] [blame^] | 1 | //===-- lib/subtf3.c - Quad-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 quad-precision soft-float subtraction with the |
| 11 | // IEEE-754 default rounding (to nearest, ties to even). |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #define QUAD_PRECISION |
| 16 | #include "fp_lib.h" |
| 17 | |
| 18 | #if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT) |
| 19 | COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b); |
| 20 | |
| 21 | // Subtraction; flip the sign bit of b and add. |
| 22 | COMPILER_RT_ABI fp_t |
| 23 | __subtf3(fp_t a, fp_t b) { |
| 24 | return __addtf3(a, fromRep(toRep(b) ^ signBit)); |
| 25 | } |
| 26 | |
| 27 | #endif |