1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
3 #include <linux/errno.h>
4 #include <linux/uaccess.h>
5
6 #include <asm/sfp-machine.h>
7 #include <math-emu/soft-fp.h>
8 #include <math-emu/double.h>
9
10 int
11 fsub(void *frD, void *frA, void *frB)
12 {
13 FP_DECL_D(A);
14 FP_DECL_D(B);
15 FP_DECL_D(R);
16 FP_DECL_EX;
17
18 #ifdef DEBUG
19 printk("%s: %p %p %p\n", __func__, frD, frA, frB);
20 #endif
21
22 FP_UNPACK_DP(A, frA);
23 FP_UNPACK_DP(B, frB);
24
25 #ifdef DEBUG
26 printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
27 printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
28 #endif
29
30 if (B_c != FP_CLS_NAN)
31 B_s ^= 1;
32
33 if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
34 FP_SET_EXCEPTION(EFLAG_VXISI);
35
36 FP_ADD_D(R, A, B);
37
38 #ifdef DEBUG
39 printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
40 #endif
41
42 __FP_PACK_D(frD, R);
43
44 return FP_CUR_EXCEPTIONS;
45 }
46
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