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13fd91db82
Summary: Fix LSRInstance::HoistInsertPosition() to check the original insert position block first for a canonical insertion point that is dominated by all inputs. This leads to SCEV being able to reuse more instructions since it currently tracks the instructions it creates for reuse by keeping a table of <Value, insert point> pairs. Originally reviewed in http://reviews.llvm.org/D18001 Reviewers: atrick Subscribers: llvm-commits, mzolotukhin, mcrosier Differential Revision: http://reviews.llvm.org/D18480 llvm-svn: 271929
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; 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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