vendor/llvm/llvm-r72732

1 files changed, 39 insertions, 0 deletions

diff --git a/test/CodeGen/Generic/2003-05-30-BadFoldGEP.ll b/test/CodeGen/Generic/2003-05-30-BadFoldGEP.ll
new file mode 100644
index 000000000000..41c90bd29d38
--- /dev/null
+++ b/test/CodeGen/Generic/2003-05-30-BadFoldGEP.ll
@@ -0,0 +1,39 @@
+; RUN: llvm-as < %s | llc
+
+;; Date:     May 28, 2003.
+;; From:     test/Programs/External/SPEC/CINT2000/254.gap.llvm.bc
+;; Function: int %OpenOutput(sbyte* %filename.1)
+;;
+;; Error:    A sequence of GEPs is folded incorrectly by llc during selection
+;;	     causing an assertion about a dynamic casting error.
+;;	     This code sequence was produced (correctly) by preselection
+;;	     from a nested pair of ConstantExpr getelementptrs.
+;;	     The code below is the output of preselection.
+;;	     The original ConstantExprs are included in a comment.
+;;
+;; Cause:    FoldGetElemChain() was inserting an extra leading 0 even though
+;;	     the first instruction in the sequence contributes no indices.
+;;	     The next instruction contributes a leading non-zero so another
+;;	     zero should not be added before it!
+;;
+        %FileType = type { i32, [256 x i8], i32, i32, i32, i32 }
+@OutputFiles = external global [16 x %FileType]         ; <[16 x %FileType]*> [#uses=1]
+@Output = internal global %FileType* null               ; <%FileType**> [#uses=1]
+
+define internal i32 @OpenOutput(i8* %filename.1) {
+entry:
+        %tmp.0 = load %FileType** @Output               ; <%FileType*> [#uses=1]
+        %tmp.4 = getelementptr %FileType* %tmp.0, i64 1         ; <%FileType*> [#uses=1]
+        %addrOfGlobal = getelementptr [16 x %FileType]* @OutputFiles, i64 0             ; <[16 x %FileType]*> [#uses=1]
+        %constantGEP = getelementptr [16 x %FileType]* %addrOfGlobal, i64 1             ; <[16 x %FileType]*> [#uses=1]
+        %constantGEP.upgrd.1 = getelementptr [16 x %FileType]* %constantGEP, i64 0, i64 0               ; <%FileType*> [#uses=1]
+        %tmp.10 = icmp eq %FileType* %tmp.4, %constantGEP.upgrd.1               ; <i1> [#uses=1]
+        br i1 %tmp.10, label %return, label %endif.0
+
+endif.0:                ; preds = %entry
+        ret i32 0
+
+return:         ; preds = %entry
+        ret i32 1
+}
+