According to the SPARCv8 and SPARCv9 manuals, the jmpl, rett and return
instructions should generate a mem_address_not_aligned trap if either
of the low-order two bits of the target address is nonzero.
This is true, but in that case alignment should be enforced for loads ands
stores as well. The checks also incur a performance penalty for little
advantage. Maybe the checks should be enabled only with a compile/run-time
option.
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