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Regression test for llc bug that was folding two getelementptrs illegally.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3971 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2002-09-28 18:09:05 +00:00
parent 1c397aae8e
commit d28c8c801e
2 changed files with 54 additions and 0 deletions
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27
test/CodeGen/Generic/badFoldGEP.ll Normal file
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;; GetMemInstArgs() folded the two getElementPtr instructions together,
;; producing an illegal getElementPtr. That's because the type generated
;; by the last index for the first one is a structure field, not an array
;; element, and the second one indexes off that structure field.
;; The code is legal but not type-safe and the two GEPs should not be folded.
;;
;; This code fragment is from Spec/CINT2000/197.parser/197.parser.bc,
;; file post_process.c, function build_domain().
;; (Modified to replace store with load and return load value.)
;;
%Domain = type { sbyte*, int, int*, int, int, int*, %Domain* }
%domain_array = internal uninitialized global [497 x %Domain]
implementation; Functions:
declare void %opaque([497 x %Domain]*)
int %main(int %argc, sbyte** %argv) {
bb0: ;[#uses=0]
call void %opaque([497 x %Domain]* %domain_array)
%cann-indvar-idxcast = cast int %argc to long
%reg841 = getelementptr [497 x %Domain]* %domain_array, long 0, long %cann-indvar-idxcast, ubyte 3
%reg846 = getelementptr int* %reg841, long 1
%reg820 = load int* %reg846
ret int %reg820
}

27
test/LLC/badFoldGEP.ll Normal file
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;; GetMemInstArgs() folded the two getElementPtr instructions together,
;; producing an illegal getElementPtr. That's because the type generated
;; by the last index for the first one is a structure field, not an array
;; element, and the second one indexes off that structure field.
;; The code is legal but not type-safe and the two GEPs should not be folded.
;;
;; This code fragment is from Spec/CINT2000/197.parser/197.parser.bc,
;; file post_process.c, function build_domain().
;; (Modified to replace store with load and return load value.)
;;
%Domain = type { sbyte*, int, int*, int, int, int*, %Domain* }
%domain_array = internal uninitialized global [497 x %Domain]
implementation; Functions:
declare void %opaque([497 x %Domain]*)
int %main(int %argc, sbyte** %argv) {
bb0: ;[#uses=0]
call void %opaque([497 x %Domain]* %domain_array)
%cann-indvar-idxcast = cast int %argc to long
%reg841 = getelementptr [497 x %Domain]* %domain_array, long 0, long %cann-indvar-idxcast, ubyte 3
%reg846 = getelementptr int* %reg841, long 1
%reg820 = load int* %reg846
ret int %reg820
}