Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
fcmpu.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 
9 int
10 fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
11 {
12  FP_DECL_D(A);
13  FP_DECL_D(B);
14  FP_DECL_EX;
15  int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
16  long cmp;
17 
18 #ifdef DEBUG
19  printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, 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  FP_CMP_D(cmp, A, B, 2);
31  cmp = code[(cmp + 1) & 3];
32 
33  __FPU_FPSCR &= ~(0x1f000);
34  __FPU_FPSCR |= (cmp << 12);
35 
36  *ccr &= ~(15 << ((7 - crfD) << 2));
37  *ccr |= (cmp << ((7 - crfD) << 2));
38 
39 #ifdef DEBUG
40  printk("CR: %08x\n", *ccr);
41 #endif
42 
43  return 0;
44 }