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llvm-mirror/test/Analysis/BasicAA/q.bad.ll
Nikita Popov ab6e561d30 [BasicAA] Make sure types match in constant offset heuristic 
This can only happen if offset types that are larger than the
pointer size are involved. The previous implementation did not
assert in this case because it initialized the APInts to the
width of one of the variables -- though I strongly suspect it
did not compute correct results in this case.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32621
reported by fhahn.
2021-03-28 21:38:09 +02:00

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; RUN: opt < %s -basic-aa -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
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
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
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(i32 %p, i8* %mem) {
%p.minus1 = add i32 %p, -1 ; this will always unsigned-wrap, unless %p == 0
%p.minus1.64 = zext i32 %p.minus1 to i64
%p.64.again = add i64 %p.minus1.64, 1 ; either %p (if we wrapped) or 4294967296 (if we didn't)
%p.nsw.nuw.minus1 = sub nsw nuw i32 %p, 1 ; as nuw we know %p >= 1, and as nsw %p <= 2147483647
%p.nsw.nuw.minus1.64 = zext i32 %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 i32 %p, 1 ; only nsw, so can only guarantee %p != 0x10000000
%p.nsw.minus1.64 = zext i32 %p.nsw.minus1 to i64 ; when %p > 0x10000000 (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 i32 %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
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
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
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
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
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
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*
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*
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
ret void
}
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