1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/types.h>
3*4882a593Smuzhiyun #include <linux/errno.h>
4*4882a593Smuzhiyun #include <linux/uaccess.h>
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <asm/sfp-machine.h>
7*4882a593Smuzhiyun #include <math-emu/soft-fp.h>
8*4882a593Smuzhiyun #include <math-emu/double.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun int
fsub(void * frD,void * frA,void * frB)11*4882a593Smuzhiyun fsub(void *frD, void *frA, void *frB)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun FP_DECL_D(A);
14*4882a593Smuzhiyun FP_DECL_D(B);
15*4882a593Smuzhiyun FP_DECL_D(R);
16*4882a593Smuzhiyun FP_DECL_EX;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #ifdef DEBUG
19*4882a593Smuzhiyun printk("%s: %p %p %p\n", __func__, frD, frA, frB);
20*4882a593Smuzhiyun #endif
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun FP_UNPACK_DP(A, frA);
23*4882a593Smuzhiyun FP_UNPACK_DP(B, frB);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #ifdef DEBUG
26*4882a593Smuzhiyun printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
27*4882a593Smuzhiyun printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
28*4882a593Smuzhiyun #endif
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (B_c != FP_CLS_NAN)
31*4882a593Smuzhiyun B_s ^= 1;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
34*4882a593Smuzhiyun FP_SET_EXCEPTION(EFLAG_VXISI);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun FP_ADD_D(R, A, B);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun #ifdef DEBUG
39*4882a593Smuzhiyun printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
40*4882a593Smuzhiyun #endif
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun __FP_PACK_D(frD, R);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return FP_CUR_EXCEPTIONS;
45*4882a593Smuzhiyun }
46