evan.cheng at apple.com
Tue Jun 17 23:30:18 PDT 2008
On Jun 17, 2008, at 1:36 PM, David Greene wrote:
> Can someone explain the Constraints system in X86*.td?
> For example:
> let Constraints = "$src1 = $dst"
> This replaces isTwoAddress (according to svn logs), which I gather
> is how
> two-address instructions used to be marked for X86.
You're right. This is the same as isTwoAddress, just more flexible.
> Except isTwoAddress is still used in X86InstInfo.td.
Because I haven't replaced all uses of isTwoAddress with constraints,
> So what gives? What do these two properties actually do?
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