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), 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), x);
44 else
45 y = ieee754dp_add(ieee754dp_zero(0), x);
46 ieee754_csr.rm = oldrm;
47 }
48 return y;
49 }
50
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