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A bit of wisdom from Chris on the last entry. 

llvm-svn: 25715
This commit is contained in:
Evan Cheng 2006-01-27 22:54:32 +00:00
parent 63045d221b
commit 18243826fd
1 changed files with 10 additions and 1 deletions
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11
llvm/lib/Target/X86/README.txt
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@ -187,4 +187,13 @@ fn1:
ret ret
The problem is the store's chain operand is not the load X but rather The problem is the store's chain operand is not the load X but rather
a TokenFactor of the load X and load Y. This prevents the folding. a TokenFactor of the load X and load Y, which prevents the folding.
There are two ways to fix this:
1. The dag combiner can start using alias analysis to realize that y/x
don't alias, making the store to X not dependent on the load from Y.
2. The generated isel could be made smarter in the case it can't
disambiguate the pointers.
Number 1 is the preferred solution.