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[SimplifyCFG] Teach FoldValueComparisonIntoPredecessors() to preserve DomTree, part 2

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Roman Lebedev 2021-01-01 02:21:53 +03:00
parent a815b6b2b2
commit 8866583953
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4 changed files with 5 additions and 3 deletions
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2
llvm/lib/Transforms/Utils/SimplifyCFG.cpp
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@ -1109,6 +1109,8 @@ bool SimplifyCFGOpt::FoldValueComparisonIntoPredecessors(Instruction *TI,
std::vector<DominatorTree::UpdateType> Updates;
Updates.push_back({DominatorTree::Delete, Pred, BB});
// Figure out which 'cases' to copy from SI to PSI.
std::vector<ValueEqualityComparisonCase> BBCases;
BasicBlock *BBDefault = GetValueEqualityComparisonCases(TI, BBCases);

2
llvm/test/Transforms/PGOProfile/chr.ll
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@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -chr -instcombine -simplifycfg -S -enable-new-pm=0 | FileCheck %s
; RUN: opt < %s -chr -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S -enable-new-pm=0 | FileCheck %s
; RUN: opt < %s -passes='require<profile-summary>,function(chr,instcombine,simplify-cfg)' -S | FileCheck %s
declare void @foo()

2
llvm/test/Transforms/SimplifyCFG/2008-12-16-DCECond.ll
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@ -1,4 +1,4 @@
; RUN: opt < %s -simplifycfg -S -hoist-common-insts=true | not grep icmp
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S -hoist-common-insts=true | not grep icmp
; ModuleID = '/tmp/x.bc'
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-pc-linux-gnu"

2
llvm/test/Transforms/SimplifyCFG/switch_switch_fold.ll
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@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -S | FileCheck %s
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
; Test that a switch going to a switch on the same value can be merged.
; All three switches in this example can be merged into one big one.