linux/arch/powerpc/math-emu/fcmpo.c
<<
>>
Prefs
   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
  10fcmpo(u32 *ccr, int crfD, void *frA, void *frB)
  11{
  12        FP_DECL_D(A);
  13        FP_DECL_D(B);
  14        FP_DECL_EX;
  15        int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
  16        long cmp;
  17
  18#ifdef DEBUG
  19        printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, frA, frB);
  20#endif
  21
  22        FP_UNPACK_DP(A, frA);
  23        FP_UNPACK_DP(B, frB);
  24
  25#ifdef DEBUG
  26        printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  27        printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  28#endif
  29
  30        if (A_c == FP_CLS_NAN || B_c == FP_CLS_NAN)
  31                FP_SET_EXCEPTION(EFLAG_VXVC);
  32
  33        FP_CMP_D(cmp, A, B, 2);
  34        cmp = code[(cmp + 1) & 3];
  35
  36        __FPU_FPSCR &= ~(0x1f000);
  37        __FPU_FPSCR |= (cmp << 12);
  38
  39        *ccr &= ~(15 << ((7 - crfD) << 2));
  40        *ccr |= (cmp << ((7 - crfD) << 2));
  41
  42#ifdef DEBUG
  43        printk("CR: %08x\n", *ccr);
  44#endif
  45
  46        return FP_CUR_EXCEPTIONS;
  47}
  48