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llvm-project/llvm/test/Analysis/BasicAA/q.bad.ll
Nikita Popov 57d57b1afd [AAEval] Make compatible with opaque pointers 
With opaque pointers, we cannot use the pointer element type to
determine the LocationSize for the AA query. Instead, -aa-eval
tests are now required to have an explicit load or store for any
pointer they want to compute alias results for, and the load/store
types are used to determine the location size.

This may affect ordering of results, and sorting within one result,
as the type is not considered part of the sorted string anymore.

To somewhat minimize the churn, printing still uses faux typed
pointer notation.
2022-03-16 10:02:11 +01:00

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; RUN: opt < %s -aa-pipeline=basic-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7--linux-gnueabi"
; CHECK-LABEL: test_zext_sext_amounts255
; CHECK: NoAlias: i8* %a, i8* %b
define void @test_zext_sext_amounts255(i8* %mem) {
%sext.1 = sext i8 255 to i16
%sext.zext.1 = zext i16 %sext.1 to i64
%sext.2 = sext i8 255 to i32
%sext.zext.2 = zext i32 %sext.2 to i64
%a = getelementptr inbounds i8, i8* %mem, i64 %sext.zext.1
%b = getelementptr inbounds i8, i8* %mem, i64 %sext.zext.2
load i8, i8* %a
load i8, i8* %b
ret void
}
; CHECK-LABEL: test_zext_sext_amounts
; CHECK: MayAlias: i8* %a, i8* %b
; %a and %b only PartialAlias as, although they're both zext(sext(%num)) they'll extend the sign by a different
; number of bits before zext-ing the remainder.
define void @test_zext_sext_amounts(i8* %mem, i8 %num) {
%sext.1 = sext i8 %num to i16
%sext.zext.1 = zext i16 %sext.1 to i64
%sext.2 = sext i8 %num to i32
%sext.zext.2 = zext i32 %sext.2 to i64
%a = getelementptr inbounds i8, i8* %mem, i64 %sext.zext.1
%b = getelementptr inbounds i8, i8* %mem, i64 %sext.zext.2
load i8, i8* %a
load i8, i8* %b
ret void
}
; CHECK-LABEL: based_on_pr18068
; CHECK: NoAlias: i8* %a, i8* %b
; CHECK: NoAlias: i8* %a, i8* %c
define void @based_on_pr18068(i32 %loaded, i8* %mem) {
%loaded.64 = zext i32 %loaded to i64
%add1 = add i32 %loaded, -1 ; unsigned wraps unless %loaded == 0
%add1.64 = zext i32 %add1 to i64 ; is zext(%loaded) always != zext(%loaded - 1)? Yes -> NoAlias
%sub1 = sub i32 %loaded, 1 ; unsigned wraps iff %loaded == 0
%sub1.64 = zext i32 %sub1 to i64 ; is zext(%loaded) always != zext(%loaded - 1)? Yes -> NoAlias
%a = getelementptr inbounds i8, i8* %mem, i64 %loaded.64
%b = getelementptr inbounds i8, i8* %mem, i64 %add1.64
%c = getelementptr inbounds i8, i8* %mem, i64 %sub1.64
load i8, i8* %a
load i8, i8* %b
load i8, i8* %c
ret void
}
; CHECK-LABEL: test_path_dependence
; CHECK: MayAlias: i8* %a, i8* %b
; CHECK: MustAlias: i8* %a, i8* %c
; CHECK: MayAlias: i8* %a, i8* %d
define void @test_path_dependence(i16 %p, i8* %mem) {
%p.minus1 = add i16 %p, -1 ; this will always unsigned-wrap, unless %p == 0
%p.minus1.64 = zext i16 %p.minus1 to i64
%p.64.again = add i64 %p.minus1.64, 1 ; either %p (if we wrapped) or 65536 (if we didn't)
%p.nsw.nuw.minus1 = sub nsw nuw i16 %p, 1 ; as nuw we know %p >= 1, and as nsw %p <= 32767
%p.nsw.nuw.minus1.64 = zext i16 %p.nsw.nuw.minus1 to i64
%p.nsw.nuw.64.again = add nsw nuw i64 %p.nsw.nuw.minus1.64, 1 ; ...so always exactly %p
%p.nsw.minus1 = sub nsw i16 %p, 1 ; only nsw, so can only guarantee %p != 0x1000
%p.nsw.minus1.64 = zext i16 %p.nsw.minus1 to i64 ; when %p > 0x1000 (ie <= 0 as a signed number) then the zext will make this a huge positive number
%p.nsw.64.again = add nsw i64 %p.nsw.minus1.64, 1 ; ...and so this is very much != %p
%p.64 = zext i16 %p to i64
%a = getelementptr inbounds i8, i8* %mem, i64 %p.64
%b = getelementptr inbounds i8, i8* %mem, i64 %p.64.again
%c = getelementptr inbounds i8, i8* %mem, i64 %p.nsw.nuw.64.again
%d = getelementptr inbounds i8, i8* %mem, i64 %p.nsw.64.again
load i8, i8* %a
load i8, i8* %b
load i8, i8* %c
load i8, i8* %d
ret void
}
; CHECK-LABEL: test_zext_sext_255
; CHECK: NoAlias: i8* %a, i8* %b
define void @test_zext_sext_255(i8* %mem) {
%zext.255 = zext i8 255 to i16 ; 0x00FF
%sext.255 = sext i8 255 to i16 ; 0xFFFF
%zext.sext.255 = zext i16 %sext.255 to i32 ; 0x0000FFFF
%sext.zext.255 = sext i16 %zext.255 to i32 ; 0x000000FF
%zext.zext.sext.255 = zext i32 %zext.sext.255 to i64
%zext.sext.zext.255 = zext i32 %sext.zext.255 to i64
%a = getelementptr inbounds i8, i8* %mem, i64 %zext.zext.sext.255
%b = getelementptr inbounds i8, i8* %mem, i64 %zext.sext.zext.255
load i8, i8* %a
load i8, i8* %b
ret void
}
; CHECK-LABEL: test_zext_sext_num
; CHECK: MayAlias: i8* %a, i8* %b
; %a and %b NoAlias if %num == 255 (see @test_zext_sext_255), but %a and %b NoAlias for other values of %num (e.g. 0)
define void @test_zext_sext_num(i8* %mem, i8 %num) {
%zext.num = zext i8 %num to i16
%sext.num = sext i8 %num to i16
%zext.sext.num = zext i16 %sext.num to i32
%sext.zext.num = sext i16 %zext.num to i32
%zext.zext.sext.num = zext i32 %zext.sext.num to i64
%zext.sext.zext.num = zext i32 %sext.zext.num to i64
%a = getelementptr inbounds i8, i8* %mem, i64 %zext.zext.sext.num
%b = getelementptr inbounds i8, i8* %mem, i64 %zext.sext.zext.num
load i8, i8* %a
load i8, i8* %b
ret void
}
; CHECK-LABEL: uncompressStream
; CHECK: MustAlias: i8* %a, i8* %b
; CHECK: NoAlias: i8* %a, i8* %c
define void @uncompressStream(i8* %mem) {
%zext.255 = zext i8 255 to i32
%sext.255 = sext i8 255 to i32
%a = getelementptr inbounds i8, i8* %mem, i32 255
%b = getelementptr inbounds i8, i8* %mem, i32 %zext.255
%c = getelementptr inbounds i8, i8* %mem, i32 %sext.255
load i8, i8* %a
load i8, i8* %b
load i8, i8* %c
ret void
}
; CHECK-LABEL: constantOffsetHeuristic_i3_i32
; CHECK: NoAlias: i32* %a, i32* %b
; CHECK: NoAlias: i32* %a, i32* %c
; CHECK: NoAlias: i32* %b, i32* %c
define void @constantOffsetHeuristic_i3_i32(i32* %mem, i3 %val) {
%zext.plus.7 = add nsw i3 %val, 7
%zext.plus.4 = add nsw i3 %val, 4
%zext.val = zext i3 %val to i32
%zext.4 = zext i3 %zext.plus.4 to i32
%zext.7 = zext i3 %zext.plus.7 to i32
%a = getelementptr inbounds i32, i32* %mem, i32 %zext.4
%b = getelementptr inbounds i32, i32* %mem, i32 %zext.7
%c = getelementptr inbounds i32, i32* %mem, i32 %zext.val
load i32, i32* %a
load i32, i32* %b
load i32, i32* %c
ret void
}
; CHECK-LABEL: constantOffsetHeuristic_i8_i32
; CHECK: NoAlias: i32* %a, i32* %b
; CHECK: NoAlias: i32* %a, i32* %c
; CHECK: NoAlias: i32* %b, i32* %c
define void @constantOffsetHeuristic_i8_i32(i32* %mem, i8 %val) {
%zext.plus.7 = add nsw i8 %val, 7
%zext.plus.4 = add nsw i8 %val, 4
%zext.val = zext i8 %val to i32
%zext.4 = zext i8 %zext.plus.4 to i32
%zext.7 = zext i8 %zext.plus.7 to i32
%a = getelementptr inbounds i32, i32* %mem, i32 %zext.4
%b = getelementptr inbounds i32, i32* %mem, i32 %zext.7
%c = getelementptr inbounds i32, i32* %mem, i32 %zext.val
load i32, i32* %a
load i32, i32* %b
load i32, i32* %c
ret void
}
; CHECK-LABEL: constantOffsetHeuristic_i3_i8
; CHECK: MayAlias: i32* %a, i32* %b
; CHECK: NoAlias: i32* %a, i32* %c
; CHECK: MayAlias: i32* %b, i32* %c
define void @constantOffsetHeuristic_i3_i8(i8* %mem, i3 %val) {
%zext.plus.7 = add nsw i3 %val, 7
%zext.plus.4 = add nsw i3 %val, 4
%zext.val = zext i3 %val to i32
%zext.4 = zext i3 %zext.plus.4 to i32
%zext.7 = zext i3 %zext.plus.7 to i32
%a.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.4
%b.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.7
%c.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.val
%a = bitcast i8* %a.8 to i32*
%b = bitcast i8* %b.8 to i32*
%c = bitcast i8* %c.8 to i32*
load i32, i32* %a
load i32, i32* %b
load i32, i32* %c
ret void
}
; CHECK-LABEL: constantOffsetHeuristic_i8_i8
; CHECK: MayAlias: i32* %a, i32* %b
; CHECK: NoAlias: i32* %a, i32* %c
; CHECK: NoAlias: i32* %b, i32* %c
define void @constantOffsetHeuristic_i8_i8(i8* %mem, i8 %val) {
%zext.plus.7 = add nsw i8 %val, 7
%zext.plus.4 = add nsw i8 %val, 4
%zext.val = zext i8 %val to i32
%zext.4 = zext i8 %zext.plus.4 to i32
%zext.7 = zext i8 %zext.plus.7 to i32
%a.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.4
%b.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.7
%c.8 = getelementptr inbounds i8, i8* %mem, i32 %zext.val
%a = bitcast i8* %a.8 to i32*
%b = bitcast i8* %b.8 to i32*
%c = bitcast i8* %c.8 to i32*
load i32, i32* %a
load i32, i32* %b
load i32, i32* %c
ret void
}
; CHECK-LABEL: different_large_bitwidths
; MayAlias: i64* %p1, i64* %p2
define void @different_large_bitwidths(i8* %a, i64 %i, i128 %j) {
%p1 = getelementptr i8, i8* %a, i64 %i
%p2 = getelementptr i8, i8* %a, i128 %j
load i8, i8* %p1
load i8, i8* %p2
ret void
}
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