| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* IEEE754 floating point arithmetic |
| 3 | * double precision: common utilities |
| 4 | */ |
| 5 | /* |
| 6 | * MIPS floating point support |
| 7 | * Copyright (C) 1994-2000 Algorithmics Ltd. |
| 8 | */ |
| 9 | |
| 10 | #include "ieee754dp.h" |
| 11 | |
| 12 | union ieee754dp ieee754dp_neg(union ieee754dp x) |
| 13 | { |
| 14 | union ieee754dp y; |
| 15 | |
| 16 | if (ieee754_csr.abs2008) { |
| 17 | y = x; |
| 18 | DPSIGN(y) = !DPSIGN(x); |
| 19 | } else { |
| 20 | unsigned int oldrm; |
| 21 | |
| 22 | oldrm = ieee754_csr.rm; |
| 23 | ieee754_csr.rm = FPU_CSR_RD; |
| 24 | y = ieee754dp_sub(ieee754dp_zero(0), y: x); |
| 25 | ieee754_csr.rm = oldrm; |
| 26 | } |
| 27 | return y; |
| 28 | } |
| 29 | |
| 30 | union ieee754dp ieee754dp_abs(union ieee754dp x) |
| 31 | { |
| 32 | union ieee754dp y; |
| 33 | |
| 34 | if (ieee754_csr.abs2008) { |
| 35 | y = x; |
| 36 | DPSIGN(y) = 0; |
| 37 | } else { |
| 38 | unsigned int oldrm; |
| 39 | |
| 40 | oldrm = ieee754_csr.rm; |
| 41 | ieee754_csr.rm = FPU_CSR_RD; |
| 42 | if (DPSIGN(x)) |
| 43 | y = ieee754dp_sub(ieee754dp_zero(0), y: x); |
| 44 | else |
| 45 | y = ieee754dp_add(ieee754dp_zero(0), y: x); |
| 46 | ieee754_csr.rm = oldrm; |
| 47 | } |
| 48 | return y; |
| 49 | } |
| 50 |