arch/powerpc/math-emu/fsqrt.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/errno.h>
   4 #include <linux/uaccess.h>
   5
   6 #include <asm/sfp-machine.h>
   7 #include <math-emu/soft-fp.h>
   8 #include <math-emu/double.h>
   9
  10 int
  11 fsqrt(void *frD, void *frB)
  12 {
  13         FP_DECL_D(B);
  14         FP_DECL_D(R);
  15         FP_DECL_EX;
  16
  17 #ifdef DEBUG
  18         printk("%s: %p %p %p %p\n", __func__, frD, frB);
  19 #endif
  20
  21         FP_UNPACK_DP(B, frB);
  22
  23 #ifdef DEBUG
  24         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  25 #endif
  26
  27         if (B_s && B_c != FP_CLS_ZERO)
  28                 FP_SET_EXCEPTION(EFLAG_VXSQRT);
  29         if (B_c == FP_CLS_NAN)
  30                 FP_SET_EXCEPTION(EFLAG_VXSNAN);
  31
  32         FP_SQRT_D(R, B);
  33
  34 #ifdef DEBUG
  35         printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  36 #endif
  37
  38         __FP_PACK_D(frD, R);
  39
  40         return FP_CUR_EXCEPTIONS;
  41 }