[PATCH] D40035: [LoopRotate] processLoop should return true even if it just simplified the loop latch without making any other changes
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Tue Nov 14 16:24:18 PST 2017
This revision was automatically updated to reflect the committed changes.
Closed by commit rL318237: [LoopRotate] processLoop should return true even if it just simplified the loop… (authored by ctopper).
Changed prior to commit:
https://reviews.llvm.org/D40035?vs=122888&id=122945#toc
Repository:
rL LLVM
https://reviews.llvm.org/D40035
Files:
llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
llvm/trunk/test/Transforms/LoopRotate/pr35210.ll
Index: llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
===================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
+++ llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
@@ -634,7 +634,7 @@
if ((MadeChange || SimplifiedLatch) && LoopMD)
L->setLoopID(LoopMD);
- return MadeChange;
+ return MadeChange || SimplifiedLatch;
}
LoopRotatePass::LoopRotatePass(bool EnableHeaderDuplication)
Index: llvm/trunk/test/Transforms/LoopRotate/pr35210.ll
===================================================================
--- llvm/trunk/test/Transforms/LoopRotate/pr35210.ll
+++ llvm/trunk/test/Transforms/LoopRotate/pr35210.ll
@@ -0,0 +1,70 @@
+;RUN: opt %s -passes='adce,loop(rotate),adce' -S -debug-pass-manager -debug-only=loop-rotate 2>&1 | FileCheck %s
+
+; This test is to make sure we invalidate the post dominator pass after loop rotate simplifies the loop latch.
+; The adce passes are here to make sure post dominator analysis is required.
+
+; CHECK: Starting llvm::Function pass manager run.
+; CHECK-NEXT: Running pass: ADCEPass on f
+; CHECK-NEXT: Running analysis: DominatorTreeAnalysis on f
+; CHECK-NEXT: Running analysis: PostDominatorTreeAnalysis on f
+; CHECK-NEXT: Running pass: FunctionToLoopPassAdaptor{{.*}} on f
+; CHECK-NEXT: Running analysis: LoopAnalysis on f
+; CHECK-NEXT: Running analysis: AssumptionAnalysis on f
+; CHECK-NEXT: Running analysis: AAManager on f
+; CHECK-NEXT: Running analysis: TargetLibraryAnalysis on f
+; CHECK-NEXT: Running analysis: ScalarEvolutionAnalysis on f
+; CHECK-NEXT: Running analysis: TargetIRAnalysis on f
+; CHECK-NEXT: Running analysis: InnerAnalysisManagerProxy{{.*}} on f
+; CHECK-NEXT: Starting Loop pass manager run.
+; CHECK-NEXT: Running pass: LoopRotatePass on Loop at depth 1 containing: %bb<header><exiting>,%bb4<latch>
+; CHECK-NEXT: Folding loop latch bb4 into bb
+; CHECK-NEXT: Invalidating all non-preserved analyses for: bb
+; CHECK-NEXT: Finished Loop pass manager run.
+; CHECK-NEXT: Invalidating all non-preserved analyses for: f
+; CHECK-NEXT: Invalidating analysis: PostDominatorTreeAnalysis on f
+; CHECK-NEXT: Running pass: ADCEPass on f
+; CHECK-NEXT: Running analysis: PostDominatorTreeAnalysis on f
+; CHECK-NEXT: Finished llvm::Function pass manager run.
+
+; CHECK-LABEL: define i8 @f() {
+; CHECK-NEXT : entry:
+; CHECK-NEXT : br label %bb
+; CHECK-NEXT :
+; CHECK-NEXT : bb: ; preds = %bb, %entry
+; CHECK-NEXT : %mode.0 = phi i8 [ 0, %entry ], [ %indvar.next, %bb ]
+; CHECK-NEXT : %tmp5 = icmp eq i8 %mode.0, 1
+; CHECK-NEXT : %indvar.next = add i8 %mode.0, 1
+; CHECK-NEXT : br i1 %tmp5, label %bb5, label %bb
+; CHECK-NEXT :
+; CHECK-NEXT : bb5: ; preds = %bb
+; CHECK-NEXT : tail call void @raise_exception() #0
+; CHECK-NEXT : unreachable
+; CHECK-NEXT : }
+; CHECK-NEXT :
+; CHECK-NEXT : ; Function Attrs: noreturn
+; CHECK-NEXT : declare void @raise_exception() #0
+; CHECK-NEXT :
+; CHECK-NEXT : attributes #0 = { noreturn }
+
+define i8 @f() {
+entry:
+ br label %bb
+
+bb: ; preds = %bb4, %entry
+ %mode.0 = phi i8 [ 0, %entry ], [ %indvar.next, %bb4 ]
+ %tmp5 = icmp eq i8 %mode.0, 1
+ br i1 %tmp5, label %bb5, label %bb4
+
+bb4: ; preds = %bb2
+ %indvar.next = add i8 %mode.0, 1
+ br label %bb
+
+bb5: ; preds = %bb2
+ tail call void @raise_exception() #0
+ unreachable
+}
+
+; Function Attrs: noreturn
+declare void @raise_exception() #0
+
+attributes #0 = { noreturn }
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