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