forked from OSchip/llvm-project
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
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; RUN: opt < %s -loop-reduce -S
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; Test that SCEV insertpoint's don't get corrupted and cause an
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; invalid instruction to be inserted in a block other than its parent.
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; See http://reviews.llvm.org/D20703 for context.
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define void @test() {
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entry:
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%bf.load = load i32, i32* null, align 4
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%bf.clear = lshr i32 %bf.load, 1
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%div = and i32 %bf.clear, 134217727
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%sub = add nsw i32 %div, -1
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%0 = zext i32 %sub to i64
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br label %while.cond
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while.cond: ; preds = %cond.end, %entry
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%indvars.iv = phi i64 [ %indvars.iv.next, %cond.end ], [ 0, %entry ]
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%cmp = icmp eq i64 %indvars.iv, %0
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br i1 %cmp, label %cleanup16, label %while.body
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while.body: ; preds = %while.cond
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%1 = trunc i64 %indvars.iv to i32
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%mul = shl i32 %1, 1
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%add = add nuw i32 %mul, 2
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%cmp3 = icmp ult i32 %add, 0
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br i1 %cmp3, label %if.end, label %if.then
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if.then: ; preds = %while.body
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unreachable
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if.end: ; preds = %while.body
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br i1 false, label %cond.end, label %cond.true
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cond.true: ; preds = %if.end
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br label %cond.end
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cond.end: ; preds = %cond.true, %if.end
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%add7 = add i32 %1, 1
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%cmp12 = icmp ugt i32 %add7, %sub
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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br i1 %cmp12, label %if.then13, label %while.cond
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if.then13: ; preds = %cond.end
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unreachable
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cleanup16: ; preds = %while.cond
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ret void
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}
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