[PATCH] D21802: Ensure all uses of permute instruction feed vector stores

[Kit Barton via llvm-commits]

kbarton added a comment.

In http://reviews.llvm.org/D21802#469887, @wschmidt wrote:

> The patch LGTM.  One question: Did you check for the reverse situation?  Can we have a swap that is fed by more than one instruction, where one is not a load, or is that already handled in the code?  I realize this may not come up in practice if we don't have a machine sinking pass.


This is already handled in the code. If the register defined by a swapping load is used in something other than a swapping load/swapping store, then the web is rejected.  Unless there is another case outside of this that I'm not seeing....


http://reviews.llvm.org/D21802