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PR9634: Don't unconditionally tell the AliasSetTracker that the PreheaderLoad

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is equivalent to any other relevant value; it isn't true in general.
If it is equivalent, the LoopPromoter will tell the AST the equivalence.
Also, delete the PreheaderLoad if it is unused.

Chris, since you were the last one to make major changes here, can you check
that this is sane?



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-04-07 01:35:06 +00:00
parent 8424a60fc9
commit 0e382192c1
4 changed files with 45 additions and 23 deletions
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2
test/Analysis/BasicAA/store-promote.ll
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@@ -24,7 +24,7 @@ Out: ; preds = %Loop
; The Loop block should be empty after the load/store are promoted.
; CHECK: @test1
; CHECK: load i32* @B
; CHECK: load i32* @A
; CHECK: Loop:
; CHECK-NEXT: br i1 %c, label %Out, label %Loop
; CHECK: Out: