kernel/2.6.29.6-aldebaran-rt/arch/powerpc/math-emu/fsqrt.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 fsqrt(void *frD, void *frB)
  11 {
  12         FP_DECL_D(B);
  13         FP_DECL_D(R);
  14         FP_DECL_EX;
  15
  16 #ifdef DEBUG
  17         printk("%s: %p %p %p %p\n", __func__, frD, frB);
  18 #endif
  19
  20         FP_UNPACK_DP(B, frB);
  21
  22 #ifdef DEBUG
  23         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  24 #endif
  25
  26         if (B_s && B_c != FP_CLS_ZERO)
  27                 FP_SET_EXCEPTION(EFLAG_VXSQRT);
  28         if (B_c == FP_CLS_NAN)
  29                 FP_SET_EXCEPTION(EFLAG_VXSNAN);
  30
  31         FP_SQRT_D(R, B);
  32
  33 #ifdef DEBUG
  34         printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  35 #endif
  36
  37         __FP_PACK_D(frD, R);
  38
  39         return FP_CUR_EXCEPTIONS;
  40 }