Apparatus and methods for exception handling for fused micro-operations by re-issue in the unfused format

摘要

In some embodiments of the invention, an instruction decoder has a fused decoding mode and an unfused decoding mode. If an exception occurs during execution of a fused micro-operation that was decoded from a particular macroinstruction, then an exception handler may cause the particular macroinstruction to be decoded by the instruction decoder in unfused decoding mode.