From fd2bc11248f76b2131a1630761ea43ce01ec010d Mon Sep 17 00:00:00 2001
From: Florian Hahn <florian.hahn@arm.com>
Date: Thu, 26 Apr 2018 10:26:17 +0000
Subject: [LoopInterchange] Ignore debug intrinsics during legality checks.

Reviewers: aprantl, mcrosier, karthikthecool

Reviewed By: aprantl

Subscribers: mattd, vsk, #debug-info, llvm-commits

Differential Revision: https://reviews.llvm.org/D45379

llvm-svn: 330931
---
 llvm/lib/Transforms/Scalar/LoopInterchange.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'llvm/lib/Transforms')

diff --git a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
index 45d76fdb7c9..b10ec265891 100644
--- a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -923,7 +923,8 @@ bool LoopInterchangeLegality::currentLimitations() {
   // instruction.
 
   bool FoundInduction = false;
-  for (const Instruction &I : llvm::reverse(*InnerLoopLatch)) {
+  for (const Instruction &I :
+       llvm::reverse(InnerLoopLatch->instructionsWithoutDebug())) {
     if (isa<BranchInst>(I) || isa<CmpInst>(I) || isa<TruncInst>(I) ||
         isa<ZExtInst>(I))
       continue;
@@ -976,10 +977,9 @@ bool LoopInterchangeLegality::canInterchangeLoops(unsigned InnerLoopId,
     });
     return false;
   }
-
   // Check if outer and inner loop contain legal instructions only.
   for (auto *BB : OuterLoop->blocks())
-    for (Instruction &I : *BB)
+    for (Instruction &I : BB->instructionsWithoutDebug())
       if (CallInst *CI = dyn_cast<CallInst>(&I)) {
         // readnone functions do not prevent interchanging.
         if (CI->doesNotReadMemory())
-- 
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