arch/ppc/math-emu/fcmpo.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 fcmpo(u32 *ccr, int crfD, void *frA, void *frB)
  10 {
  11         FP_DECL_D(A);
  12         FP_DECL_D(B);
  13         int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
  14         long cmp;
  15         int ret = 0;
  16
  17 #ifdef DEBUG
  18         printk("%s: %p (%08x) %d %p %p\n", __FUNCTION__, ccr, *ccr, crfD, frA, frB);
  19 #endif
  20
  21         __FP_UNPACK_D(A, frA);
  22         __FP_UNPACK_D(B, frB);
  23
  24 #ifdef DEBUG
  25         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  26         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  27 #endif
  28
  29         if (A_c == FP_CLS_NAN || B_c == FP_CLS_NAN)
  30                 ret |= EFLAG_VXVC;
  31
  32         FP_CMP_D(cmp, A, B, 2);
  33         cmp = code[(cmp + 1) & 3];
  34
  35         __FPU_FPSCR &= ~(0x1f000);
  36         __FPU_FPSCR |= (cmp << 12);
  37
  38         *ccr &= ~(15 << ((7 - crfD) << 2));
  39         *ccr |= (cmp << ((7 - crfD) << 2));
  40
  41 #ifdef DEBUG
  42         printk("CR: %08x\n", *ccr);
  43 #endif
  44
  45         return ret;
  46 }