Axcelerator compile options are available only from the Options > Compile menu. They do not appear when you click the Compile button in Designer.
The Axcelerator and ProASIC3/E families includes an optional register on the input path, an optional register on the output path, and an optional register on the 3-state control pin. Select the option Combine Registers into I/Os where possible to take advantage of these registers.
Setting Abort on PDC Error aborts the PDC import when an error is encountered. When this check box is selected, the PDC file is either imported fully or the design is left untouched.