Special copy SUnit's do not have SDNode's.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45787 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index 4cd4577715d6baf888e5010e52dfcf710b3633db..05ba46d6ac6cf9f32c80a6adc28aeca2574914d7 100644 (file)
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1208,13 +1208,13 @@ static unsigned calcMaxScratches(const SUnit *SU) {
   for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
        I != E; ++I) {
     if (I->isCtrl) continue;  // ignore chain preds
-    if (I->Dep->Node->getOpcode() != ISD::CopyFromReg)
+    if (!I->Dep->Node || I->Dep->Node->getOpcode() != ISD::CopyFromReg)
       Scratches++;
   }
   for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
        I != E; ++I) {
     if (I->isCtrl) continue;  // ignore chain succs
-    if (I->Dep->Node->getOpcode() != ISD::CopyToReg)
+    if (!I->Dep->Node || I->Dep->Node->getOpcode() != ISD::CopyToReg)
       Scratches += 10;
   }
   return Scratches;

diff --git a/test/CodeGen/X86/2008-01-08-SchedulerCrash.ll b/test/CodeGen/X86/2008-01-08-SchedulerCrash.ll
new file mode 100644 (file)
index 0000000..f31a38e
--- /dev/null
+++ b/test/CodeGen/X86/2008-01-08-SchedulerCrash.ll
@@ -0,0 +1,32 @@
+; RUN: llvm-as < %s | llc -march=x86
+
+       %struct.indexentry = type { i32, i8*, i8*, i8*, i8*, i8* }
+
+define i32 @_bfd_stab_section_find_nearest_line(i32 %offset) nounwind  {
+entry:
+       %tmp910 = add i32 0, %offset            ; <i32> [#uses=1]
+       br i1 true, label %bb951, label %bb917
+
+bb917:         ; preds = %entry
+       ret i32 0
+
+bb951:         ; preds = %bb986, %entry
+       %tmp955 = sdiv i32 0, 2         ; <i32> [#uses=3]
+       %tmp961 = getelementptr %struct.indexentry* null, i32 %tmp955, i32 0            ; <i32*> [#uses=1]
+       br i1 true, label %bb986, label %bb967
+
+bb967:         ; preds = %bb951
+       ret i32 0
+
+bb986:         ; preds = %bb951
+       %tmp993 = load i32* %tmp961, align 4            ; <i32> [#uses=1]
+       %tmp995 = icmp ugt i32 %tmp993, %tmp910         ; <i1> [#uses=2]
+       %tmp1002 = add i32 %tmp955, 1           ; <i32> [#uses=1]
+       %low.0 = select i1 %tmp995, i32 0, i32 %tmp1002         ; <i32> [#uses=1]
+       %high.0 = select i1 %tmp995, i32 %tmp955, i32 0         ; <i32> [#uses=1]
+       %tmp1006 = icmp eq i32 %low.0, %high.0          ; <i1> [#uses=1]
+       br i1 %tmp1006, label %UnifiedReturnBlock, label %bb951
+
+UnifiedReturnBlock:            ; preds = %bb986
+       ret i32 1
+}