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leader table. That's because it wasn't expecting instructions to turn up as leader for a value number that is not its own, but equality propagation could create this situation. One solution is to have the leader table use a WeakVH but this slows down GVN by about 5%. Instead just have equality propagation not add instructions to the leader table, only constants and arguments. In theory this might cause GVN to run more (each time it changes something it runs again) but it doesn't seem to occur enough to cause a slow down. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157251 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
1022 B
LLVM
34 lines
1022 B
LLVM
; RUN: opt < %s -gvn
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; PR12858
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define void @fn5(i16 signext %p1, i8 signext %p2) nounwind uwtable {
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entry:
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br i1 undef, label %if.else, label %if.then
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if.then: ; preds = %entry
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br label %if.end
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if.else: ; preds = %entry
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%conv = sext i16 %p1 to i32
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%conv1 = sext i16 %p1 to i32
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br i1 undef, label %if.then3, label %if.else4
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if.then3: ; preds = %if.end
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br label %if.end12
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if.else4: ; preds = %if.end
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%conv7 = sext i8 %p2 to i32
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%cmp8 = icmp eq i32 %conv1, %conv7
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br i1 %cmp8, label %if.then10, label %if.end12
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if.then10: ; preds = %if.else4
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br label %if.end12
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if.end12: ; preds = %if.then10, %if.else4, %if.then3
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%conv13 = sext i8 %p2 to i32
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ret void
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}
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