[llvm-commits] patch: extract element fix in DAGCombine

[Mon Ping Wang]

Hi,
This small patch fixes a small problem in DAGCombine for extract  
vector element.  The current code will fail if we try to extract from  
a bit convert of a shuffle where the bit convert changes the number of  
elements.  The optimization tries to go through the bit convert and  
uses the extract vector index to examine the mask of the shuffle.   
This is not safe when the bit convert changes the number and size of  
the elements.  The fix is to only try to do the optimization if the  
bit convert doesn't change the number of elements.

-- Mon Ping

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