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Thumb branch target alignment

The assembler can issue warnings about non word-aligned branch targets in Thumb code.

On some processors, non word-aligned Thumb instructions sometimes take one or more additional cycles to execute in loops. This means that it can be an advantage to ensure that branch targets are word-aligned. To ensure the assembler reports such warnings, use the following command-line option when invoking the assembler:

armasm --diag_warning 1604