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86eb682529
Summary: This is last in of a series of patches to evolve ADCE.cpp to support removing of unnecessary control flow. This patch adds the code to update the control and data flow graphs to remove the dead control flow. Also update unit tests to test the capability to remove dead, may-be-infinite loop which is enabled by the switch -adce-remove-loops. Previous patches: D23824 [ADCE] Add handling of PHI nodes when removing control flow D23559 [ADCE] Add control dependence computation D23225 [ADCE] Modify data structures to support removing control flow D23065 [ADCE] Refactor anticipating new functionality (NFC) D23102 [ADCE] Refactoring for new functionality (NFC) Reviewers: dberlin, majnemer, nadav, mehdi_amini Subscribers: llvm-commits, david2050, freik, twoh Differential Revision: https://reviews.llvm.org/D24918 llvm-svn: 289548
36 lines
1.6 KiB
LLVM
36 lines
1.6 KiB
LLVM
; This testcase contains a entire loop that should be removed. The only thing
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; left is the store instruction in BB0. The problem this testcase was running
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; into was that when the reg109 PHI was getting zero predecessors, it was
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; removed even though there were uses still around. Now the uses are filled
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; in with a dummy value before the PHI is deleted.
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;
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; RUN: opt < %s -S -adce | grep bb1
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; RUN: opt < %s -S -adce -adce-remove-loops | FileCheck %s
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%node_t = type { double*, %node_t*, %node_t**, double**, double*, i32, i32 }
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define void @localize_local(%node_t* %nodelist) {
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bb0:
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%nodelist.upgrd.1 = alloca %node_t* ; <%node_t**> [#uses=2]
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store %node_t* %nodelist, %node_t** %nodelist.upgrd.1
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br label %bb1
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bb1: ; preds = %bb0
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%reg107 = load %node_t*, %node_t** %nodelist.upgrd.1 ; <%node_t*> [#uses=2]
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%cond211 = icmp eq %node_t* %reg107, null ; <i1> [#uses=1]
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; CHECK: br label %bb3
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br i1 %cond211, label %bb3, label %bb2
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bb2: ; preds = %bb2, %bb1
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%reg109 = phi %node_t* [ %reg110, %bb2 ], [ %reg107, %bb1 ] ; <%node_t*> [#uses=1]
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%reg212 = getelementptr %node_t, %node_t* %reg109, i64 0, i32 1 ; <%node_t**> [#uses=1]
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%reg110 = load %node_t*, %node_t** %reg212 ; <%node_t*> [#uses=2]
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%cond213 = icmp ne %node_t* %reg110, null ; <i1> [#uses=1]
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; CHECK: br label %bb3
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br i1 %cond213, label %bb2, label %bb3
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bb3: ; preds = %bb2, %bb1
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ret void
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}
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