[llvm-commits] [llvm] r79252 - in /llvm/trunk: lib/Transforms/Utils/SSI.cpp test/Transforms/SSI/2009-08-17-CritEdge.ll

[Nick Lewycky]

Author: nicholas
Date: Mon Aug 17 12:00:57 2009
New Revision: 79252

URL: http://llvm.org/viewvc/llvm-project?rev=79252&view=rev
Log:
Don't crash on critical edge. Patch by Andre Tavares.

Added:
    llvm/trunk/test/Transforms/SSI/2009-08-17-CritEdge.ll
Modified:
    llvm/trunk/lib/Transforms/Utils/SSI.cpp

Modified: llvm/trunk/lib/Transforms/Utils/SSI.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/SSI.cpp?rev=79252&r1=79251&r2=79252&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Utils/SSI.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/SSI.cpp Mon Aug 17 12:00:57 2009
@@ -95,7 +95,7 @@
           // Next Basic Block
           BasicBlock *BB_next = TI->getSuccessor(j);
           if (BB_next != BB &&
-              BB_next->getUniquePredecessor() != NULL &&
+              BB_next->getSinglePredecessor() != NULL &&
               dominateAny(BB_next, value[i])) {
             PHINode *PN = PHINode::Create(
                 value[i]->getType(), SSI_SIG, BB_next->begin());

Added: llvm/trunk/test/Transforms/SSI/2009-08-17-CritEdge.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/SSI/2009-08-17-CritEdge.ll?rev=79252&view=auto

==============================================================================
--- llvm/trunk/test/Transforms/SSI/2009-08-17-CritEdge.ll (added)
+++ llvm/trunk/test/Transforms/SSI/2009-08-17-CritEdge.ll Mon Aug 17 12:00:57 2009
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | opt -abcd -disable-output
+
+define void @test(i32 %x) {
+entry:
+  br label %label1
+label1:
+  %A = phi i32 [ 0, %entry ], [ %A.1, %label2 ]
+  %B = icmp slt i32 %A, %x
+  br i1 %B, label %label2, label %label2
+label2:
+  %A.1 = add i32 %A, 1
+  br label %label1
+label3:  ; No predecessors!
+  ret void
+}