kernel/2.6.29.6-aldebaran-rt/arch/powerpc/math-emu/fcmpo.c

   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 fcmpo(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         if (A_c == FP_CLS_NAN || B_c == FP_CLS_NAN)
  31                 FP_SET_EXCEPTION(EFLAG_VXVC);
  32
  33         FP_CMP_D(cmp, A, B, 2);
  34         cmp = code[(cmp + 1) & 3];
  35
  36         __FPU_FPSCR &= ~(0x1f000);
  37         __FPU_FPSCR |= (cmp << 12);
  38
  39         *ccr &= ~(15 << ((7 - crfD) << 2));
  40         *ccr |= (cmp << ((7 - crfD) << 2));
  41
  42 #ifdef DEBUG
  43         printk("CR: %08x\n", *ccr);
  44 #endif
  45
  46         return FP_CUR_EXCEPTIONS;
  47 }