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This option enables reordering of instructions (instruction scheduling) to
achieve better performance on pipelined architectures such as the Intel 486
and Pentium processors.  This option is essential for generating fast code
for the Intel Pentium processor.  Selecting this option will make it
slightly more difficult to debug because the assembly language instructions
generated for a source statement may be intermixed with instructions
generated for surrounding statements.  The macro __SW_OR will be predefined
if "or" is selected.