Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
fnmsubs.c
Go to the documentation of this file.
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 #include <math-emu/single.h>
9 
10 int
11 fnmsubs(void *frD, void *frA, void *frB, void *frC)
12 {
13  FP_DECL_D(R);
14  FP_DECL_D(A);
15  FP_DECL_D(B);
16  FP_DECL_D(C);
17  FP_DECL_D(T);
18  FP_DECL_EX;
19 
20 #ifdef DEBUG
21  printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
22 #endif
23 
24  FP_UNPACK_DP(A, frA);
25  FP_UNPACK_DP(B, frB);
26  FP_UNPACK_DP(C, frC);
27 
28 #ifdef DEBUG
29  printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
30  printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
31  printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
32 #endif
33 
34  if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
35  (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
37 
38  FP_MUL_D(T, A, C);
39 
40  if (B_c != FP_CLS_NAN)
41  B_s ^= 1;
42 
43  if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
45 
46  FP_ADD_D(R, T, B);
47 
48  if (R_c != FP_CLS_NAN)
49  R_s ^= 1;
50 
51 #ifdef DEBUG
52  printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
53 #endif
54 
55  __FP_PACK_DS(frD, R);
56 
57  return FP_CUR_EXCEPTIONS;
58 }