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Add support for simplifying a load from a computed value to a load from a global when it

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is provable that they're equivalent.  This fixes PR4855.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2010-09-03 19:08:37 +00:00
parent ac53061464
commit 1593dd6779
3 changed files with 63 additions and 8 deletions
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18
test/Transforms/CorrelatedValuePropagation/basic.ll
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@@ -39,3 +39,21 @@ bb3: ; preds = %bb1
; CHECK: ret i1 %res
ret i1 %res
}
; PR4855
@gv = internal constant i8 7
; CHECK: @test3
define i8 @test3(i8* %a) nounwind {
entry:
%cond = icmp eq i8* %a, @gv
br i1 %cond, label %bb2, label %bb
bb: ; preds = %entry
ret i8 0
bb2: ; preds = %entry
; CHECK-NOT: load i8* %a
%should_be_const = load i8* %a
; CHECK: ret i8 7
ret i8 %should_be_const
}