clear the tarval buffer before fc_val_from_ieee754() fills bits in. There...

clear the tarval buffer before fc_val_from_ieee754() fills bits in. There seems to be uninitialized bytes ...

[r16407]

ir/tv/fltcalc.c

@@ -1063,6 +1063,9 @@ fp_value *fc_val_from_ieee754(LLDBL l, char exp_size, char mant_size, fp_value *
 	if (result == NULL) result = calc_buffer;
 	temp = alloca(value_size);
 
+	/* CLEAR the buffer */
+	memset(result, 0, fc_get_buffer_length());
+
 	result->desc.exponent_size = exp_size;
 	result->desc.mantissa_size = mant_size;