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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26217 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-02-15 19:52:06 +00:00
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commit 5946fef1db
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lib/Target/README.txt
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@ -64,3 +64,15 @@ Number 1 is the preferred solution.
//===---------------------------------------------------------------------===//
DAG combine this into mul A, 8:
int %test(int %A) {
%B = mul int %A, 8 ;; shift
%C = add int %B, 7 ;; dead, no demanded bits.
%D = and int %C, -8 ;; dead once add is gone.
ret int %D
}
This sort of thing occurs in the alloca lowering code and other places that
are generating alignment of an already aligned value.