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fnmadd.c
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1 #include <linux/types.h>
2 #include <linux/errno.h>
3 #include <asm/uaccess.h>
4 
5 #include <asm/sfp-machine.h>
6 #include <math-emu/soft-fp.h>
7 #include <math-emu/double.h>
8 
9 int
10 fnmadd(void *frD, void *frA, void *frB, void *frC)
11 {
12  FP_DECL_D(R);
13  FP_DECL_D(A);
14  FP_DECL_D(B);
15  FP_DECL_D(C);
16  FP_DECL_D(T);
17  FP_DECL_EX;
18 
19 #ifdef DEBUG
20  printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
21 #endif
22 
23  FP_UNPACK_DP(A, frA);
24  FP_UNPACK_DP(B, frB);
25  FP_UNPACK_DP(C, frC);
26 
27 #ifdef DEBUG
28  printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
29  printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
30  printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
31 #endif
32 
33  if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
34  (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
36 
37  FP_MUL_D(T, A, C);
38 
39  if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
41 
42  FP_ADD_D(R, T, B);
43 
44  if (R_c != FP_CLS_NAN)
45  R_s ^= 1;
46 
47 #ifdef DEBUG
48  printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
49 #endif
50 
51  __FP_PACK_D(frD, R);
52 
53  return FP_CUR_EXCEPTIONS;
54 }