arch/powerpc/math-emu/fsqrt.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <asm/uaccess.h>
   4
   5 #include "soft-fp.h"
   6 #include "double.h"
   7
   8 int
   9 fsqrt(void *frD, void *frB)
  10 {
  11         FP_DECL_D(B);
  12         FP_DECL_D(R);
  13         int ret = 0;
  14
  15 #ifdef DEBUG
  16         printk("%s: %p %p %p %p\n", __func__, frD, frB);
  17 #endif
  18
  19         __FP_UNPACK_D(B, frB);
  20
  21 #ifdef DEBUG
  22         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  23 #endif
  24
  25         if (B_s && B_c != FP_CLS_ZERO)
  26                 ret |= EFLAG_VXSQRT;
  27         if (B_c == FP_CLS_NAN)
  28                 ret |= EFLAG_VXSNAN;
  29
  30         FP_SQRT_D(R, B);
  31
  32 #ifdef DEBUG
  33         printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  34 #endif
  35
  36         return (ret | __FP_PACK_D(frD, R));
  37 }