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A bit of wisdom from Chris on the last entry.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25715 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng
2006-01-27 22:54:32 +00:00
parent 85214ba3cc
commit d41e9e5e7a
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 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.