[DAGCombiner] Fix for oss-fuzz bug
llvm-svn: 330178
diff --git a/llvm/test/CodeGen/Generic/dag-combine-ossfuzz-crash.ll b/llvm/test/CodeGen/Generic/dag-combine-ossfuzz-crash.ll
new file mode 100644
index 0000000..650d4b4
--- /dev/null
+++ b/llvm/test/CodeGen/Generic/dag-combine-ossfuzz-crash.ll
@@ -0,0 +1,53 @@
+; RUN: llc < %s
+
+; llc built with address sanitizer crashes because of a dangling node pointer
+; oss-fuzz - DAGCombiner::useDivRem (5011)
+
+define void @f() {
+BB:
+ %A19 = alloca i1**
+ %C18 = icmp ugt i1 true, false
+ %L13 = load i8, i8* undef
+ %L10 = load i8, i8* undef
+ %B12 = and i8 %L13, %L10
+ %B35 = and i8 %B12, %L10
+ %L2 = load i66*, i66** undef
+ %L23 = load i66, i66* %L2
+ %B38 = urem i8 %B35, %B12
+ %B9 = ashr i66 %L23, %L23
+ %C11 = icmp sge i8 %B38, %B35
+ %A4 = alloca i66
+ %G4 = getelementptr i66, i66* %A4, i1 true
+ %L6 = load i66, i66* %G4
+ %B21 = urem i1 %C11, true
+ %B1 = mul i66 %B9, %L23
+ %B5 = udiv i8 %L10, %L13
+ %B22 = udiv i66 %B9, %B1
+ %C29 = icmp ult i32 -1, 0
+ store i1* undef, i1** undef
+ store i1 %C29, i1* undef
+ br label %BB1
+
+BB1: ; preds = %BB
+ %G8 = getelementptr i66, i66* undef, i16 32767
+ %G43 = getelementptr i66, i66* undef, i66 -1
+ %L20 = load i1, i1* undef
+ %B7 = and i66 %L6, %L6
+ %B30 = sdiv i66 -36893488147419103232, -1
+ %B16 = urem i66 %B22, %L6
+ %G47 = getelementptr i66, i66* %G8, i66 %B16
+ store i66 %B7, i66* %G47
+ store i8 %B5, i8* undef
+ %C5 = icmp ult i1 %C18, %L20
+ store i66 %B30, i66* %G47
+ store i1** undef, i1*** %A19
+ store i1 %C5, i1* undef
+ store i1 %C11, i1* undef
+ store i66* %G43, i66** undef
+ store i1 %B21, i1* undef
+ %G59 = getelementptr i1, i1* undef, i1 false
+ %G61 = getelementptr i66, i66* %G8, i1 %L20
+ store i1 %L20, i1* %G59
+ store i66* %G61, i66** undef
+ ret void
+}