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[SimplifyCFG] Add command-line option to disable the pass #130965

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[SimplifyCFG] Add command-line option to disable the pass #130965

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7 changes: 7 additions & 0 deletions llvm/lib/Transforms/Scalar/SimplifyCFGPass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,10 @@ static cl::opt<bool> UserSpeculateUnpredictables(
"speculate-unpredictables", cl::Hidden, cl::init(false),
cl::desc("Speculate unpredictable branches (default = false)"));

static cl::opt<bool> DisableSimplifyCFG(
"disable-simplify-cfg", cl::Hidden, cl::init(false),
cl::desc("Disable simplify cfg"));

STATISTIC(NumSimpl, "Number of blocks simplified");

static bool
Expand Down Expand Up @@ -307,6 +311,9 @@ static bool simplifyFunctionCFG(Function &F, const TargetTransformInfo &TTI,
(DT && DT->verify(DominatorTree::VerificationLevel::Full))) &&
"Original domtree is invalid?");

if (DisableSimplifyCFG)
return false;

bool Changed = simplifyFunctionCFGImpl(F, TTI, DT, Options);

assert((!RequireAndPreserveDomTree ||
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13 changes: 13 additions & 0 deletions llvm/test/Transforms/SimplifyCFG/disable-simplify-cfg.ll
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@@ -0,0 +1,13 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=simplifycfg -disable-simplify-cfg=true -S | FileCheck %s

define void @test1() {
; CHECK-LABEL: define void @test1() {
; CHECK-NEXT: br label %[[BB1:.*]]
; CHECK: [[BB1]]:
; CHECK-NEXT: ret void
;
br label %1
ret void
}

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