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91b2307a89
gep P, (zext x) != gep P, (sext x) DecomposeGEPExpression was getting this wrong, confusing basicaa. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111352 91177308-0d34-0410-b5e6-96231b3b80d8
128 lines
3.9 KiB
LLVM
128 lines
3.9 KiB
LLVM
; This testcase tests for various features the basicaa test should be able to
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; determine, as noted in the comments.
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; RUN: opt < %s -basicaa -gvn -instcombine -dce -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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@Global = external global { i32 }
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declare void @external(i32*)
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; Array test: Test that operations on one local array do not invalidate
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; operations on another array. Important for scientific codes.
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;
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define i32 @different_array_test(i64 %A, i64 %B) {
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%Array1 = alloca i32, i32 100
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%Array2 = alloca i32, i32 200
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call void @external(i32* %Array1)
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call void @external(i32* %Array2)
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%pointer = getelementptr i32* %Array1, i64 %A
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%val = load i32* %pointer
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%pointer2 = getelementptr i32* %Array2, i64 %B
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store i32 7, i32* %pointer2
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%REMOVE = load i32* %pointer ; redundant with above load
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%retval = sub i32 %REMOVE, %val
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ret i32 %retval
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; CHECK: @different_array_test
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; CHECK: ret i32 0
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}
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; Constant index test: Constant indexes into the same array should not
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; interfere with each other. Again, important for scientific codes.
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;
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define i32 @constant_array_index_test() {
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%Array = alloca i32, i32 100
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call void @external(i32* %Array)
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%P1 = getelementptr i32* %Array, i64 7
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%P2 = getelementptr i32* %Array, i64 6
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%A = load i32* %P1
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store i32 1, i32* %P2 ; Should not invalidate load
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%BREMOVE = load i32* %P1
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%Val = sub i32 %A, %BREMOVE
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ret i32 %Val
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; CHECK: @constant_array_index_test
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; CHECK: ret i32 0
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}
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; Test that if two pointers are spaced out by a constant getelementptr, that
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; they cannot alias.
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define i32 @gep_distance_test(i32* %A) {
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%REMOVEu = load i32* %A
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%B = getelementptr i32* %A, i64 2 ; Cannot alias A
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store i32 7, i32* %B
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%REMOVEv = load i32* %A
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%r = sub i32 %REMOVEu, %REMOVEv
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ret i32 %r
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; CHECK: @gep_distance_test
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; CHECK: ret i32 0
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}
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; Test that if two pointers are spaced out by a constant offset, that they
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; cannot alias, even if there is a variable offset between them...
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define i32 @gep_distance_test2({i32,i32}* %A, i64 %distance) {
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%A1 = getelementptr {i32,i32}* %A, i64 0, i32 0
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%REMOVEu = load i32* %A1
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%B = getelementptr {i32,i32}* %A, i64 %distance, i32 1
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store i32 7, i32* %B ; B cannot alias A, it's at least 4 bytes away
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%REMOVEv = load i32* %A1
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%r = sub i32 %REMOVEu, %REMOVEv
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ret i32 %r
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; CHECK: @gep_distance_test2
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; CHECK: ret i32 0
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}
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; Test that we can do funny pointer things and that distance calc will still
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; work.
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define i32 @gep_distance_test3(i32 * %A) {
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%X = load i32* %A
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%B = bitcast i32* %A to i8*
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%C = getelementptr i8* %B, i64 4
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store i8 42, i8* %C
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%Y = load i32* %A
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%R = sub i32 %X, %Y
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ret i32 %R
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; CHECK: @gep_distance_test3
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; CHECK: ret i32 0
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}
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; Test that we can disambiguate globals reached through constantexpr geps
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define i32 @constexpr_test() {
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%X = alloca i32
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call void @external(i32* %X)
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%Y = load i32* %X
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store i32 5, i32* getelementptr ({ i32 }* @Global, i64 0, i32 0)
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%REMOVE = load i32* %X
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%retval = sub i32 %Y, %REMOVE
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ret i32 %retval
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; CHECK: @constexpr_test
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; CHECK: ret i32 0
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}
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; PR7589
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; These two index expressions are different, this cannot be CSE'd.
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define i16 @zext_sext_confusion(i16* %row2col, i5 %j) nounwind{
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entry:
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%sum5.cast = zext i5 %j to i64 ; <i64> [#uses=1]
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%P1 = getelementptr i16* %row2col, i64 %sum5.cast
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%row2col.load.1.2 = load i16* %P1, align 1 ; <i16> [#uses=1]
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%sum13.cast31 = sext i5 %j to i6 ; <i6> [#uses=1]
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%sum13.cast = zext i6 %sum13.cast31 to i64 ; <i64> [#uses=1]
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%P2 = getelementptr i16* %row2col, i64 %sum13.cast
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%row2col.load.1.6 = load i16* %P2, align 1 ; <i16> [#uses=1]
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%.ret = sub i16 %row2col.load.1.6, %row2col.load.1.2 ; <i16> [#uses=1]
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ret i16 %.ret
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; CHECK: @zext_sext_confusion
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; CHECK: ret i16 %.ret
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}
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