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A bit of wisdom from Chris on the last entry.

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llvm-svn: 25715
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Evan Cheng 2006-01-27 22:54:32 +00:00
parent 03aaa82992
commit 442713efd7
1 changed files with 10 additions and 1 deletions
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11
lib/Target/X86/README.txt
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@ -187,4 +187,13 @@ fn1:
ret
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.