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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
38 lines
1.1 KiB
LLVM
38 lines
1.1 KiB
LLVM
; THis testcase caused an assertion failure because a PHI node did not have
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; entries for it's postdominator. But I think this can only happen when the
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; PHI node is dead, so we just avoid patching up dead PHI nodes.
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; RUN: opt < %s -adce -S | FileCheck %s
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; RUN: opt < %s -adce -adce-remove-loops -S | FileCheck %s
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target datalayout = "e-p:32:32"
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define void @dead_test8() {
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entry:
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br label %loopentry
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loopentry: ; preds = %endif, %entry
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%k.1 = phi i32 [ %k.0, %endif ], [ 0, %entry ] ; <i32> [#uses=1]
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br i1 false, label %no_exit, label %return
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no_exit: ; preds = %loopentry
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; CHECK: br label %then
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br i1 false, label %then, label %else
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then: ; preds = %no_exit
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br label %endif
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else: ; preds = %no_exit
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%dec = add i32 %k.1, -1 ; <i32> [#uses=1]
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br label %endif
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endif: ; preds = %else, %then
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%k.0 = phi i32 [ %dec, %else ], [ 0, %then ] ; <i32> [#uses=1]
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store i32 2, i32* null
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br label %loopentry
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return: ; preds = %loopentry
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ret void
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}
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