2003-05-30-BadFoldGEP.ll
1.94 KB
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; RUN: llc < %s
;; 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*, %FileType** @Output ; <%FileType*> [#uses=1]
%tmp.4 = getelementptr %FileType, %FileType* %tmp.0, i64 1 ; <%FileType*> [#uses=1]
%addrOfGlobal = getelementptr [16 x %FileType], [16 x %FileType]* @OutputFiles, i64 0 ; <[16 x %FileType]*> [#uses=1]
%constantGEP = getelementptr [16 x %FileType], [16 x %FileType]* %addrOfGlobal, i64 1 ; <[16 x %FileType]*> [#uses=1]
%constantGEP.upgrd.1 = getelementptr [16 x %FileType], [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
}