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Linux/arch/powerpc/math-emu/fmsub.c

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  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 
  9 int
 10 fmsub(void *frD, void *frA, void *frB, void *frC)
 11 {
 12         FP_DECL_D(R);
 13         FP_DECL_D(A);
 14         FP_DECL_D(B);
 15         FP_DECL_D(C);
 16         FP_DECL_D(T);
 17         FP_DECL_EX;
 18 
 19 #ifdef DEBUG
 20         printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
 21 #endif
 22 
 23         FP_UNPACK_DP(A, frA);
 24         FP_UNPACK_DP(B, frB);
 25         FP_UNPACK_DP(C, frC);
 26 
 27 #ifdef DEBUG
 28         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
 29         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
 30         printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
 31 #endif
 32 
 33         if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
 34             (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
 35                 FP_SET_EXCEPTION(EFLAG_VXIMZ);
 36 
 37         FP_MUL_D(T, A, C);
 38 
 39         if (B_c != FP_CLS_NAN)
 40                 B_s ^= 1;
 41 
 42         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
 43                 FP_SET_EXCEPTION(EFLAG_VXISI);
 44 
 45         FP_ADD_D(R, T, B);
 46 
 47 #ifdef DEBUG
 48         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
 49 #endif
 50 
 51         __FP_PACK_D(frD, R);
 52 
 53         return FP_CUR_EXCEPTIONS;
 54 }
 55 

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