9b7ae23256
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
266 lines
5.2 KiB
LLVM
266 lines
5.2 KiB
LLVM
; RUN: opt < %s -jump-threading -disable-output
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%struct.ham = type { i8, i8, i16, i32 }
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%struct.zot = type { i32 (...)** }
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%struct.quux.0 = type { %struct.wombat }
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%struct.wombat = type { %struct.zot }
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@global = external global %struct.ham*, align 8
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@global.1 = external constant i8*
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declare i32 @wombat.2()
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define void @blam() {
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bb:
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%tmp = load i32, i32* undef
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%tmp1 = icmp eq i32 %tmp, 0
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br i1 %tmp1, label %bb11, label %bb2
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bb2:
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%tmp3 = tail call i32 @wombat.2()
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switch i32 %tmp3, label %bb4 [
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i32 0, label %bb5
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i32 1, label %bb7
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i32 2, label %bb7
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i32 3, label %bb11
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]
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bb4:
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br label %bb7
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bb5:
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%tmp6 = tail call i32 @wombat.2()
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br label %bb7
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bb7:
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%tmp8 = phi i32 [ 0, %bb5 ], [ 1, %bb4 ], [ 2, %bb2 ], [ 2, %bb2 ]
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%tmp9 = icmp eq i32 %tmp8, 0
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br i1 %tmp9, label %bb11, label %bb10
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bb10:
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ret void
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bb11:
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ret void
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}
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define void @spam(%struct.ham* %arg) {
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bb:
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%tmp = load i8, i8* undef, align 8
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switch i8 %tmp, label %bb11 [
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i8 1, label %bb11
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i8 2, label %bb11
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i8 3, label %bb1
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i8 4, label %bb1
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]
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bb1:
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br label %bb2
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bb2:
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%tmp3 = phi i32 [ 0, %bb1 ], [ %tmp3, %bb8 ]
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br label %bb4
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bb4:
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%tmp5 = load i8, i8* undef, align 8
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switch i8 %tmp5, label %bb11 [
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i8 0, label %bb11
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i8 1, label %bb10
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i8 2, label %bb10
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i8 3, label %bb6
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i8 4, label %bb6
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]
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bb6:
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br label %bb7
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bb7:
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br i1 undef, label %bb8, label %bb10
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bb8:
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%tmp9 = icmp eq %struct.ham* undef, %arg
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br i1 %tmp9, label %bb10, label %bb2
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bb10:
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switch i32 %tmp3, label %bb4 [
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i32 0, label %bb14
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i32 1, label %bb11
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i32 2, label %bb12
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]
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bb11:
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unreachable
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bb12:
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%tmp13 = load %struct.ham*, %struct.ham** undef
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br label %bb14
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bb14:
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%tmp15 = phi %struct.ham* [ %tmp13, %bb12 ], [ null, %bb10 ]
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br label %bb16
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bb16:
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%tmp17 = load i8, i8* undef, align 8
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switch i8 %tmp17, label %bb11 [
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i8 0, label %bb11
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i8 11, label %bb18
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i8 12, label %bb18
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]
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bb18:
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br label %bb19
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bb19:
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br label %bb20
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bb20:
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%tmp21 = load %struct.ham*, %struct.ham** undef
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switch i8 undef, label %bb22 [
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i8 0, label %bb4
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i8 11, label %bb10
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i8 12, label %bb10
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]
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bb22:
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br label %bb23
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bb23:
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%tmp24 = icmp eq %struct.ham* %tmp21, null
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br i1 %tmp24, label %bb35, label %bb25
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bb25:
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%tmp26 = icmp eq %struct.ham* %tmp15, null
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br i1 %tmp26, label %bb34, label %bb27
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bb27:
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%tmp28 = load %struct.ham*, %struct.ham** undef
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%tmp29 = icmp eq %struct.ham* %tmp28, %tmp21
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br i1 %tmp29, label %bb35, label %bb30
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bb30:
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br label %bb31
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bb31:
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%tmp32 = load i8, i8* undef, align 8
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%tmp33 = icmp eq i8 %tmp32, 0
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br i1 %tmp33, label %bb31, label %bb34
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bb34:
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br label %bb35
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bb35:
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%tmp36 = phi i1 [ true, %bb34 ], [ false, %bb23 ], [ true, %bb27 ]
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br label %bb37
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bb37:
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%tmp38 = icmp eq %struct.ham* %tmp15, null
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br i1 %tmp38, label %bb39, label %bb41
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bb39:
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%tmp40 = load %struct.ham*, %struct.ham** @global
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br label %bb41
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bb41:
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%tmp42 = select i1 %tmp36, %struct.ham* undef, %struct.ham* undef
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ret void
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}
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declare i32 @foo(...)
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define void @zot() align 2 personality i8* bitcast (i32 (...)* @foo to i8*) {
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bb:
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invoke void @bar()
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to label %bb1 unwind label %bb3
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bb1:
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invoke void @bar()
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to label %bb2 unwind label %bb4
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bb2:
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invoke void @bar()
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to label %bb6 unwind label %bb17
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bb3:
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%tmp = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb4:
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%tmp5 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb6:
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invoke void @bar()
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to label %bb7 unwind label %bb19
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bb7:
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invoke void @bar()
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to label %bb10 unwind label %bb8
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bb8:
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%tmp9 = landingpad { i8*, i32 }
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cleanup
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb10:
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%tmp11 = load i32 (%struct.zot*)*, i32 (%struct.zot*)** undef, align 8
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%tmp12 = invoke i32 %tmp11(%struct.zot* nonnull undef)
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to label %bb13 unwind label %bb21
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bb13:
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invoke void @bar()
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to label %bb14 unwind label %bb23
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bb14:
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%tmp15 = load i32 (%struct.zot*)*, i32 (%struct.zot*)** undef, align 8
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%tmp16 = invoke i32 %tmp15(%struct.zot* nonnull undef)
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to label %bb26 unwind label %bb23
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bb17:
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%tmp18 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb19:
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%tmp20 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb21:
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%tmp22 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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unreachable
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bb23:
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%tmp24 = phi %struct.quux.0* [ null, %bb26 ], [ null, %bb14 ], [ undef, %bb13 ]
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%tmp25 = landingpad { i8*, i32 }
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catch i8* bitcast (i8** @global.1 to i8*)
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catch i8* null
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br label %bb30
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bb26:
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%tmp27 = load i32 (%struct.zot*)*, i32 (%struct.zot*)** undef, align 8
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%tmp28 = invoke i32 %tmp27(%struct.zot* nonnull undef)
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to label %bb29 unwind label %bb23
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bb29:
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unreachable
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bb30:
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%tmp31 = icmp eq %struct.quux.0* %tmp24, null
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br i1 %tmp31, label %bb32, label %bb29
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bb32:
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unreachable
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}
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declare void @bar()
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