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504eb62dfb
Summary: See D37528 for a previous (non-deferred) version of this patch and its description. Preserves dominance in a deferred manner using a new class DeferredDominance. This reduces the performance impact of updating the DominatorTree at every edge insertion and deletion. A user may call DDT->flush() within JumpThreading for an up-to-date DT. This patch currently has one flush() at the end of runImpl() to ensure DT is preserved across the pass. LVI is also preserved to help subsequent passes such as CorrelatedValuePropagation. LVI is simpler to maintain and is done immediately (not deferred). The code to perform the preversation was minimally altered and simply marked as preserved for the PassManager to be informed. This extends the analysis available to JumpThreading for future enhancements such as threading across loop headers. Reviewers: dberlin, kuhar, sebpop Reviewed By: kuhar, sebpop Subscribers: mgorny, dmgreen, kuba, rnk, rsmith, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D40146 llvm-svn: 322401
41 lines
870 B
LLVM
41 lines
870 B
LLVM
; RUN: opt < %s -jump-threading -disable-output
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%struct.aaa = type { i8 }
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define void @chrome(%struct.aaa* noalias sret %arg) local_unnamed_addr #0 align 2 personality i8* bitcast (i32 (...)* @chrome2 to i8*) {
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bb:
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%tmp = load i32, i32* undef, align 4
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%tmp1 = icmp eq i32 %tmp, 0
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br i1 %tmp1, label %bb2, label %bb13
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bb2:
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%tmp3 = getelementptr inbounds %struct.aaa, %struct.aaa* %arg, i64 0, i32 0
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%tmp4 = load i8, i8* %tmp3, align 1
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%tmp5 = icmp eq i8 %tmp4, 0
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br i1 %tmp5, label %bb6, label %bb7
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bb6:
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store i8 0, i8* %tmp3, align 1
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br label %bb7
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bb7:
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%tmp8 = load i8, i8* %tmp3, align 1
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%tmp9 = icmp ne i8 %tmp8, 0
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%tmp10 = select i1 %tmp9, i1 true, i1 false
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br i1 %tmp10, label %bb12, label %bb11
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bb11:
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br label %bb12
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bb12:
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br i1 %tmp9, label %bb14, label %bb13
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bb13:
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unreachable
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bb14:
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ret void
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}
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declare i32 @chrome2(...)
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