Doing compilers seriously is also a big and expensive effort. Last I heard Intel's compiler group is about 150 strong and that was before the Compaq compiler people came on board. And Intel still funds outside compiler efforts for its uPs like the ORC work at the Chinese Academy of Science. Similarly HP has its own first class compiler team yet also funds the IMPACT team at UIUC.
Given AMD's size and profitability track record I don't see how it could afford a serious and sustained effort rolling its own compilers.
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