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MemorySSA: Fix example in header comment.

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This fixes the example so that it matches the pass's behavior. I was a
little confused by the example until I tried running it and realized that
there was a mistake.

Differential Revision: http://reviews.llvm.org/D20657

llvm-svn: 270811
This commit is contained in:
Peter Collingbourne 2016-05-26 01:19:14 +00:00
parent 0ee42ec4dc
commit 50e4140b70
1 changed files with 3 additions and 3 deletions
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6
include/llvm/Transforms/Utils/MemorySSA.h
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@ -45,9 +45,9 @@
// store i32 5, i32* %2, align 4
// ; 4 = MemoryDef(3)
// store i32 7, i32* %4, align 4
// ; MemoryUse(4)
// %7 = load i32* %2, align 4
// ; MemoryUse(3)
// %7 = load i32* %2, align 4
// ; MemoryUse(4)
// %8 = load i32* %4, align 4
// %add = add nsw i32 %7, %8
// ret i32 %add
@ -59,7 +59,7 @@
//
// Each def also has a list of users associated with it, so you can walk from
// both def to users, and users to defs. Note that we disambiguate MemoryUses,
// but not the RHS of MemoryDefs. You can see this above at %8, which would
// but not the RHS of MemoryDefs. You can see this above at %7, which would
// otherwise be a MemoryUse(4). Being disambiguated means that for a given
// store, all the MemoryUses on its use lists are may-aliases of that store (but
// the MemoryDefs on its use list may not be).