/* The decNumber package doesn't provide arithmetic for decSingle (32 bits);
convert to decDouble, use the operation for that, and convert back. */
static inline _Decimal32
d32_binary_op (dfp_binary_func op, _Decimal32 arg_a, _Decimal32 arg_b)
{
union { _Decimal32 c; decSingle f; } a32, b32, res32;
decDouble a, b, res;
decContext context;
/* Widen the operands and perform the operation. */
a32.c = arg_a;
b32.c = arg_b;
decSingleToWider (&a32.f, &a);
decSingleToWider (&b32.f, &b);
res = dfp_binary_op (op, a, b);
/* Narrow the result, which might result in an underflow or overflow. */
decContextDefault (&context, CONTEXT_INIT);
DFP_INIT_ROUNDMODE (context.round);
decSingleFromWider (&res32.f, &res, &context);
if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
{
/* decNumber exception flags we care about here. */
int ieee_flags;
int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Overflow
| DEC_IEEE_854_Underflow;
dec_flags &= context.status;
ieee_flags = DFP_IEEE_FLAGS (dec_flags);
if (ieee_flags != 0)
DFP_HANDLE_EXCEPTIONS (ieee_flags);
}
return res32.c;
}
/* decFloat operations are supported for decDouble (64 bits) and
decQuad (128 bits). The bit patterns for the types are the same. */
static inline DFP_C_TYPE
dnn_binary_op (dfp_binary_func op, DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
{
union { DFP_C_TYPE c; decFloat f; } a, b, result;
a.c = arg_a;
b.c = arg_b;
result.f = dfp_binary_op (op, a.f, b.f);
return result.c;
}
DFP_C_TYPE
DFP_DIVIDE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
{
return dfp_binary_op (decNumberDivide, arg_a, arg_b);
}
DFP_C_TYPE
DFP_MULTIPLY (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
{
return dfp_binary_op (decNumberMultiply, arg_a, arg_b);
}
DFP_C_TYPE
DFP_SUB (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
{
return dfp_binary_op (decNumberSubtract, arg_a, arg_b);
}
DFP_C_TYPE
DFP_ADD (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
{
return dfp_binary_op (decNumberAdd, arg_a, arg_b);
}