LXR linux/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
   9int
  10fsqrt(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}
  41