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llvm-project/llvm/test/Analysis/BasicAA/featuretest.ll
Nikita Popov a301e1a895
[InstCombine] Split GEPs with multiple non-zero offsets (#151333) 
Split GEPs that have more than one non-zero offset into two GEPs. This
is in preparation for the ptradd migration, which can only represent
such GEPs.

This also enables CSE and LICM of the common base.
2025-09-10 16:51:58 +02:00

196 lines
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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; This testcase tests for various features the basicaa test should be able to
; determine, as noted in the comments.
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn,instcombine,dce -S | FileCheck %s --check-prefixes=CHECK,NO_ASSUME
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn,instcombine,dce --enable-knowledge-retention -S | FileCheck %s --check-prefixes=CHECK,USE_ASSUME
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"
@Global = external global { i32 }
declare void @external(ptr)
declare void @llvm.assume(i1)
; Array test: Test that operations on one local array do not invalidate
; operations on another array. Important for scientific codes.
;
define i32 @different_array_test(i64 %A, i64 %B) {
; NO_ASSUME-LABEL: @different_array_test(
; NO_ASSUME-NEXT: [[ARRAY11:%.*]] = alloca [100 x i32], align 4
; NO_ASSUME-NEXT: [[ARRAY22:%.*]] = alloca [200 x i32], align 4
; NO_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[ARRAY11]], i32 4) ]
; NO_ASSUME-NEXT: call void @external(ptr nonnull [[ARRAY11]])
; NO_ASSUME-NEXT: call void @external(ptr nonnull [[ARRAY22]])
; NO_ASSUME-NEXT: [[POINTER2:%.*]] = getelementptr i32, ptr [[ARRAY22]], i64 [[B:%.*]]
; NO_ASSUME-NEXT: store i32 7, ptr [[POINTER2]], align 4
; NO_ASSUME-NEXT: ret i32 0
;
; USE_ASSUME-LABEL: @different_array_test(
; USE_ASSUME-NEXT: [[ARRAY11:%.*]] = alloca [100 x i32], align 4
; USE_ASSUME-NEXT: [[ARRAY22:%.*]] = alloca [200 x i32], align 4
; USE_ASSUME-NEXT: call void @external(ptr nonnull [[ARRAY11]])
; USE_ASSUME-NEXT: call void @external(ptr nonnull [[ARRAY22]])
; USE_ASSUME-NEXT: [[POINTER2:%.*]] = getelementptr i32, ptr [[ARRAY22]], i64 [[B:%.*]]
; USE_ASSUME-NEXT: store i32 7, ptr [[POINTER2]], align 4
; USE_ASSUME-NEXT: ret i32 0
;
%Array1 = alloca i32, i32 100
%Array2 = alloca i32, i32 200
call void @llvm.assume(i1 true) ["align"(ptr %Array1, i32 4)]
call void @external(ptr %Array1)
call void @external(ptr %Array2)
%pointer = getelementptr i32, ptr %Array1, i64 %A
%val = load i32, ptr %pointer
%pointer2 = getelementptr i32, ptr %Array2, i64 %B
store i32 7, ptr %pointer2
%REMOVE = load i32, ptr %pointer ; redundant with above load
%retval = sub i32 %REMOVE, %val
ret i32 %retval
}
; Constant index test: Constant indexes into the same array should not
; interfere with each other. Again, important for scientific codes.
;
define i32 @constant_array_index_test() {
; CHECK-LABEL: @constant_array_index_test(
; CHECK-NEXT: [[ARRAY1:%.*]] = alloca [100 x i32], align 4
; CHECK-NEXT: call void @external(ptr nonnull [[ARRAY1]])
; CHECK-NEXT: [[P2:%.*]] = getelementptr inbounds nuw i8, ptr [[ARRAY1]], i64 24
; CHECK-NEXT: store i32 1, ptr [[P2]], align 4
; CHECK-NEXT: ret i32 0
;
%Array = alloca i32, i32 100
call void @external(ptr %Array)
%P1 = getelementptr i32, ptr %Array, i64 7
%P2 = getelementptr i32, ptr %Array, i64 6
%A = load i32, ptr %P1
store i32 1, ptr %P2 ; Should not invalidate load
%BREMOVE = load i32, ptr %P1
%Val = sub i32 %A, %BREMOVE
ret i32 %Val
}
; Test that if two pointers are spaced out by a constant getelementptr, that
; they cannot alias.
define i32 @gep_distance_test(ptr %A) {
; NO_ASSUME-LABEL: @gep_distance_test(
; NO_ASSUME-NEXT: [[B:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 8
; NO_ASSUME-NEXT: store i32 7, ptr [[B]], align 4
; NO_ASSUME-NEXT: ret i32 0
;
; USE_ASSUME-LABEL: @gep_distance_test(
; USE_ASSUME-NEXT: [[B:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 8
; USE_ASSUME-NEXT: store i32 7, ptr [[B]], align 4
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[A]], i64 4), "nonnull"(ptr [[A]]), "align"(ptr [[A]], i64 4) ]
; USE_ASSUME-NEXT: ret i32 0
;
%REMOVEu = load i32, ptr %A
%B = getelementptr i32, ptr %A, i64 2 ; Cannot alias A
store i32 7, ptr %B
%REMOVEv = load i32, ptr %A
%r = sub i32 %REMOVEu, %REMOVEv
ret i32 %r
}
; Test that if two pointers are spaced out by a constant offset, that they
; cannot alias, even if there is a variable offset between them...
define i32 @gep_distance_test2(ptr %A, i64 %distance) {
; NO_ASSUME-LABEL: @gep_distance_test2(
; NO_ASSUME-NEXT: [[B_SPLIT:%.*]] = getelementptr { i32, i32 }, ptr [[A:%.*]], i64 [[DISTANCE:%.*]]
; NO_ASSUME-NEXT: [[B:%.*]] = getelementptr i8, ptr [[B_SPLIT]], i64 4
; NO_ASSUME-NEXT: store i32 7, ptr [[B]], align 4
; NO_ASSUME-NEXT: ret i32 0
;
; USE_ASSUME-LABEL: @gep_distance_test2(
; USE_ASSUME-NEXT: [[B_SPLIT:%.*]] = getelementptr { i32, i32 }, ptr [[A:%.*]], i64 [[DISTANCE:%.*]]
; USE_ASSUME-NEXT: [[B:%.*]] = getelementptr i8, ptr [[B_SPLIT]], i64 4
; USE_ASSUME-NEXT: store i32 7, ptr [[B]], align 4
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[A]], i64 4), "nonnull"(ptr [[A]]), "align"(ptr [[A]], i64 4) ]
; USE_ASSUME-NEXT: ret i32 0
;
%A1 = getelementptr {i32,i32}, ptr %A, i64 0, i32 0
%REMOVEu = load i32, ptr %A1
%B = getelementptr {i32,i32}, ptr %A, i64 %distance, i32 1
store i32 7, ptr %B ; B cannot alias A, it's at least 4 bytes away
%REMOVEv = load i32, ptr %A1
%r = sub i32 %REMOVEu, %REMOVEv
ret i32 %r
}
; Test that we can do funny pointer things and that distance calc will still
; work.
define i32 @gep_distance_test3(ptr %A) {
; NO_ASSUME-LABEL: @gep_distance_test3(
; NO_ASSUME-NEXT: [[C:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 4
; NO_ASSUME-NEXT: store i8 42, ptr [[C]], align 1
; NO_ASSUME-NEXT: ret i32 0
;
; USE_ASSUME-LABEL: @gep_distance_test3(
; USE_ASSUME-NEXT: [[C:%.*]] = getelementptr i8, ptr [[A:%.*]], i64 4
; USE_ASSUME-NEXT: store i8 42, ptr [[C]], align 1
; USE_ASSUME-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[A]], i64 4), "nonnull"(ptr [[A]]), "align"(ptr [[A]], i64 4) ]
; USE_ASSUME-NEXT: ret i32 0
;
%X = load i32, ptr %A
%C = getelementptr i8, ptr %A, i64 4
store i8 42, ptr %C
%Y = load i32, ptr %A
%R = sub i32 %X, %Y
ret i32 %R
}
; Test that we can disambiguate globals reached through constantexpr geps
define i32 @constexpr_test() {
; CHECK-LABEL: @constexpr_test(
; CHECK-NEXT: [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT: call void @external(ptr nonnull [[X]])
; CHECK-NEXT: store i32 5, ptr @Global, align 4
; CHECK-NEXT: ret i32 0
;
%X = alloca i32
call void @external(ptr %X)
%Y = load i32, ptr %X
store i32 5, ptr @Global
%REMOVE = load i32, ptr %X
%retval = sub i32 %Y, %REMOVE
ret i32 %retval
}
; PR7589
; These two index expressions are different, this cannot be CSE'd.
define i16 @zext_sext_confusion(ptr %row2col, i5 %j) nounwind{
; CHECK-LABEL: @zext_sext_confusion(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SUM5_CAST:%.*]] = zext i5 [[J:%.*]] to i64
; CHECK-NEXT: [[P1:%.*]] = getelementptr i16, ptr [[ROW2COL:%.*]], i64 [[SUM5_CAST]]
; CHECK-NEXT: [[ROW2COL_LOAD_1_2:%.*]] = load i16, ptr [[P1]], align 1
; CHECK-NEXT: [[SUM13_CAST31:%.*]] = sext i5 [[J]] to i6
; CHECK-NEXT: [[SUM13_CAST:%.*]] = zext i6 [[SUM13_CAST31]] to i64
; CHECK-NEXT: [[P2:%.*]] = getelementptr i16, ptr [[ROW2COL]], i64 [[SUM13_CAST]]
; CHECK-NEXT: [[ROW2COL_LOAD_1_6:%.*]] = load i16, ptr [[P2]], align 1
; CHECK-NEXT: [[DOTRET:%.*]] = sub i16 [[ROW2COL_LOAD_1_6]], [[ROW2COL_LOAD_1_2]]
; CHECK-NEXT: ret i16 [[DOTRET]]
;
entry:
%sum5.cast = zext i5 %j to i64 ; <i64> [#uses=1]
%P1 = getelementptr i16, ptr %row2col, i64 %sum5.cast
%row2col.load.1.2 = load i16, ptr %P1, align 1 ; <i16> [#uses=1]
%sum13.cast31 = sext i5 %j to i6 ; <i6> [#uses=1]
%sum13.cast = zext i6 %sum13.cast31 to i64 ; <i64> [#uses=1]
%P2 = getelementptr i16, ptr %row2col, i64 %sum13.cast
%row2col.load.1.6 = load i16, ptr %P2, align 1 ; <i16> [#uses=1]
%.ret = sub i16 %row2col.load.1.6, %row2col.load.1.2 ; <i16> [#uses=1]
ret i16 %.ret
}
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