LXR linux/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
  10int
  11fsqrt(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}
  42