On 6/1/2014 7:51 PM, Peter Relson wrote:
I believe the answer is "no", all other things being equal.
But if one of those "other things" is that the non-aligned operand spans
cache lines whereas an aligned one would not, then the answer could be a
huge "yes".
Things such as doubleword (or quadword) consistency could not be relied
upon, depending on the degree of non-alignment.
Peter Relson
z/OS Core Technology Design
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There are times, though, when things have to be aligned for specific
instructions whether hardware instructions or supervisor calls (not
necessarily SVC) that things HAVE to be on a doubleword or quadword
boundary. What I usually do then is defne a variable larger by the
appropriate number of bytes and verify by shifting the address that I am
aligned.
Lloyd
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