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kernel/linux-imx6_3.14.28/arch/powerpc/math-emu/fcmpu.c 878 Bytes
6b13f685e   김민수   BSP 최초 추가
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  #include <linux/types.h>
  #include <linux/errno.h>
  #include <asm/uaccess.h>
  
  #include <asm/sfp-machine.h>
  #include <math-emu/soft-fp.h>
  #include <math-emu/double.h>
  
  int
  fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
  {
  	FP_DECL_D(A);
  	FP_DECL_D(B);
  	FP_DECL_EX;
  	int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
  	long cmp;
  
  #ifdef DEBUG
  	printk("%s: %p (%08x) %d %p %p
  ", __func__, ccr, *ccr, crfD, frA, frB);
  #endif
  
  	FP_UNPACK_DP(A, frA);
  	FP_UNPACK_DP(B, frB);
  
  #ifdef DEBUG
  	printk("A: %ld %lu %lu %ld (%ld)
  ", A_s, A_f1, A_f0, A_e, A_c);
  	printk("B: %ld %lu %lu %ld (%ld)
  ", B_s, B_f1, B_f0, B_e, B_c);
  #endif
  
  	FP_CMP_D(cmp, A, B, 2);
  	cmp = code[(cmp + 1) & 3];
  
  	__FPU_FPSCR &= ~(0x1f000);
  	__FPU_FPSCR |= (cmp << 12);
  
  	*ccr &= ~(15 << ((7 - crfD) << 2));
  	*ccr |= (cmp << ((7 - crfD) << 2));
  
  #ifdef DEBUG
  	printk("CR: %08x
  ", *ccr);
  #endif
  
  	return 0;
  }