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clang-p2996/llvm/test/Analysis/ValueTracking/memory-dereferenceable.ll
Lee Wei 1469d82e1c Remove br i1 undef from some regression tests [NFC] (#115130) 
As defined in LangRef, branching on `undef` is undefined behavior.
This PR aims to remove undefined behavior from tests. As UB tests break
Alive2 and may be the root cause of breaking future optimizations.

Here's an Alive2 proof for one of the examples:
https://alive2.llvm.org/ce/z/TncxhP
2024-11-07 08:11:15 +00:00

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; RUN: opt -passes=print-memderefs -S < %s -disable-output -use-dereferenceable-at-point-semantics=0 2>&1 | FileCheck %s --check-prefixes=CHECK,GLOBAL
; RUN: opt -passes=print-memderefs -S < %s -disable-output -use-dereferenceable-at-point-semantics=1 2>&1 | FileCheck %s --check-prefixes=CHECK,POINT
; Uses the print-deref (+ analyze to print) pass to run
; isDereferenceablePointer() on many load instruction operands
target datalayout = "e-i32:32:64"
%TypeOpaque = type opaque
declare zeroext i1 @return_i1()
declare ptr @foo()
@globalstr = global [6 x i8] c"hello\00"
@globali32ptr = external global ptr
%struct.A = type { [8 x i8], [5 x i8] }
@globalstruct = external global %struct.A
@globalptr.align1 = external global i8, align 1
@globalptr.align16 = external global i8, align 16
; Loads from sret arguments
; CHECK-LABEL: 'test_sret'
; CHECK: %sret_gep{{.*}}(aligned)
; CHECK-NOT: %sret_gep_outside
define void @test_sret(ptr sret(%struct.A) %result, i1 %arg) {
%sret_gep = getelementptr inbounds %struct.A, ptr %result, i64 0, i32 1, i64 2
load i8, ptr %sret_gep
%sret_gep_outside = getelementptr %struct.A, ptr %result, i64 0, i32 1, i64 7
load i8, ptr %sret_gep_outside
ret void
}
; CHECK-LABEL: 'test'
define void @test(ptr addrspace(1) dereferenceable(8) %dparam,
ptr addrspace(1) dereferenceable(32) align 1 %dparam.align1,
ptr addrspace(1) dereferenceable(32) align 16 %dparam.align16)
gc "statepoint-example" {
; CHECK: The following are dereferenceable:
entry:
call void @mayfree()
; GLOBAL: %dparam{{.*}}(unaligned)
; POINT-NOT: %dparam{{.*}}(unaligned)
%load3 = load i32, ptr addrspace(1) %dparam
; GLOBAL: %relocate{{.*}}(unaligned)
; POINT-NOT: %relocate{{.*}}(unaligned)
%tok = tail call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(i1 ()) @return_i1, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %dparam)]
%relocate = call ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %tok, i32 0, i32 0)
%load4 = load i32, ptr addrspace(1) %relocate
; CHECK-NOT: %nparam
%dpa = call ptr addrspace(1) @func1(ptr addrspace(1) %dparam)
%nparam = getelementptr i32, ptr addrspace(1) %dpa, i32 5
%load5 = load i32, ptr addrspace(1) %nparam
; Load from a non-dereferenceable load
; CHECK-NOT: %nd_load
%nd_load = load ptr, ptr @globali32ptr
%load6 = load i32, ptr %nd_load
; Load from a dereferenceable load
; GLOBAL: %d4_load{{.*}}(unaligned)
; POINT-NOT: %d4_load{{.*}}(unaligned)
%d4_load = load ptr, ptr @globali32ptr, !dereferenceable !0
%load7 = load i32, ptr %d4_load
; Load from an offset not covered by the dereferenceable portion
; CHECK-NOT: %d2_load
%d2_load = load ptr, ptr @globali32ptr, !dereferenceable !1
%load8 = load i32, ptr %d2_load
; Load from a potentially null pointer with dereferenceable_or_null
; CHECK-NOT: %d_or_null_load
%d_or_null_load = load ptr, ptr @globali32ptr, !dereferenceable_or_null !0
%load9 = load i32, ptr %d_or_null_load
; Load from a non-null pointer with dereferenceable_or_null
; GLOBAL: %d_or_null_non_null_load{{.*}}(unaligned)
; POINT-NOT: %d_or_null_non_null_load{{.*}}(unaligned)
%d_or_null_non_null_load = load ptr, ptr @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
%load10 = load i32, ptr %d_or_null_non_null_load
; Loads from aligned arguments
; GLOBAL: %dparam.align1{{.*}}(unaligned)
; POINT-NOT: %dparam.align1{{.*}}(unaligned)
; POINT-NOT: %dparam.align16{{.*}}(aligned)
; GLOBAL: %dparam.align16{{.*}}(aligned)
%load15 = load i8, ptr addrspace(1) %dparam.align1, align 16
%load16 = load i8, ptr addrspace(1) %dparam.align16, align 16
; Loads from GEPs
; GLOBAL: %gep.align1.offset1{{.*}}(unaligned)
; GLOBAL: %gep.align16.offset1{{.*}}(unaligned)
; GLOBAL: %gep.align1.offset16{{.*}}(unaligned)
; GLOBAL: %gep.align16.offset16{{.*}}(aligned)
; POINT-NOT: %gep.align1.offset1{{.*}}(unaligned)
; POINT-NOT: %gep.align16.offset1{{.*}}(unaligned)
; POINT-NOT: %gep.align1.offset16{{.*}}(unaligned)
; POINT-NOT: %gep.align16.offset16{{.*}}(aligned)
%gep.align1.offset1 = getelementptr inbounds i8, ptr addrspace(1) %dparam.align1, i32 1
%gep.align16.offset1 = getelementptr inbounds i8, ptr addrspace(1) %dparam.align16, i32 1
%gep.align1.offset16 = getelementptr inbounds i8, ptr addrspace(1) %dparam.align1, i32 16
%gep.align16.offset16 = getelementptr inbounds i8, ptr addrspace(1) %dparam.align16, i32 16
%load19 = load i8, ptr addrspace(1) %gep.align1.offset1, align 16
%load20 = load i8, ptr addrspace(1) %gep.align16.offset1, align 16
%load21 = load i8, ptr addrspace(1) %gep.align1.offset16, align 16
%load22 = load i8, ptr addrspace(1) %gep.align16.offset16, align 16
; CHECK-NOT: %no_deref_return
; GLOBAL: %deref_return{{.*}}(unaligned)
; GLOBAL: %deref_and_aligned_return{{.*}}(aligned)
; POINT-NOT: %deref_return{{.*}}(unaligned)
; POINT-NOT: %deref_and_aligned_return{{.*}}(aligned)
%no_deref_return = call ptr @foo()
%deref_return = call dereferenceable(32) ptr @foo()
%deref_and_aligned_return = call dereferenceable(32) align 16 ptr @foo()
%load23 = load i32, ptr %no_deref_return
%load24 = load i32, ptr %deref_return, align 16
%load25 = load i32, ptr %deref_and_aligned_return, align 16
; Load from a dereferenceable and aligned load
; GLOBAL: %d4_unaligned_load{{.*}}(unaligned)
; GLOBAL: %d4_aligned_load{{.*}}(aligned)
; POINT-NOT: %d4_unaligned_load{{.*}}(unaligned)
; POINT-NOT: %d4_aligned_load{{.*}}(aligned)
%d4_unaligned_load = load ptr, ptr @globali32ptr, !dereferenceable !0
%d4_aligned_load = load ptr, ptr @globali32ptr, !dereferenceable !0, !align !{i64 16}
%load26 = load i32, ptr %d4_unaligned_load, align 16
%load27 = load i32, ptr %d4_aligned_load, align 16
ret void
}
; Loads from aligned allocas
; CHECK-LABEL: 'alloca_aligned'
; CHECK: %alloca.align1{{.*}}(unaligned)
; CHECK: %alloca.align16{{.*}}(aligned)
define void @alloca_aligned() {
%alloca.align1 = alloca i1, align 1
%alloca.align16 = alloca i1, align 16
call void @mayfree()
%load17 = load i1, ptr %alloca.align1, align 16
%load18 = load i1, ptr %alloca.align16, align 16
ret void
}
; CHECK-LABEL: 'alloca_basic'
; CHECK: %alloca{{.*}}(aligned)
define void @alloca_basic() {
%alloca = alloca i1
call void @mayfree()
%load2 = load i1, ptr %alloca
ret void
}
; Load from empty array alloca
; CHECK-LABEL: 'alloca_empty'
; CHECK-NOT: %empty_alloca
define void @alloca_empty() {
%empty_alloca = alloca i8, i64 0
call void @mayfree()
%empty_load = load i8, ptr %empty_alloca
ret void
}
; Alloca with no explicit alignment is aligned to preferred alignment of
; the type (specified by datalayout string).
; CHECK-LABEL: 'alloca_perfalign'
; CHECK: %alloca.noalign{{.*}}(aligned)
define void @alloca_perfalign() {
%alloca.noalign = alloca i32
call void @mayfree()
%load28 = load i32, ptr %alloca.noalign, align 8
ret void
}
; CHECK-LABEL: 'global'
; CHECK: @globalptr.align1{{.*}}(unaligned)
; CHECK: @globalptr.align16{{.*}}(aligned)
; CHECK: @globalstr{{.*}}(aligned)
define void @global() {
%load13 = load i8, ptr @globalptr.align1, align 16
%load14 = load i8, ptr @globalptr.align16, align 16
%load1 = load i8, ptr @globalstr
ret void
}
; It's OK to overrun static array size as long as we stay within underlying
; object size
; CHECK-LABEL: 'global_allocationsize'
; CHECK: %within_allocation{{.*}}(aligned)
; CHECK-NOT: %outside_allocation
define void @global_allocationsize() {
%within_allocation = getelementptr inbounds %struct.A, ptr @globalstruct, i64 0, i32 0, i64 10
%load11 = load i8, ptr %within_allocation
%outside_allocation = getelementptr inbounds %struct.A, ptr @globalstruct, i64 0, i32 1, i64 10
%load12 = load i8, ptr %outside_allocation
ret void
}
; Loads from byval arguments
; CHECK-LABEL: 'byval'
; CHECK: %i8_byval{{.*}}(aligned)
; CHECK-NOT: %bad_byval_cast
; CHECK: %byval_gep{{.*}}(aligned)
; CHECK: %A_byval{{.*}}(unaligned)
define void @byval(ptr byval(i8) %i8_byval,
ptr byval(%struct.A) %A_byval) {
call void @mayfree()
load i8, ptr %i8_byval
load i32, ptr %i8_byval
%byval_gep = getelementptr inbounds %struct.A, ptr %A_byval, i64 0, i32 1, i64 2
load i8, ptr %byval_gep
load i32, ptr %A_byval
ret void
}
; CHECK-LABEL: 'f_0'
; GLOBAL: %ptr = inttoptr i32 %val to ptr, !dereferenceable !0
; POINT-NOT: %ptr = inttoptr i32 %val to ptr, !dereferenceable !0
define i32 @f_0(i32 %val) {
%ptr = inttoptr i32 %val to ptr, !dereferenceable !0
call void @mayfree()
%load29 = load i32, ptr %ptr, align 8
ret i32 %load29
}
; The most basic case showing the difference between legacy global deref
; attribute semantics and the new point-in-time semantics.
; CHECK-LABEL: 'negative'
; GLOBAL: %p
; POINT-NOT: %p
define void @negative(ptr dereferenceable(8) %p) {
call void @mayfree()
%v = load i32, ptr %p
ret void
}
; CHECK-LABEL: 'infer_func_attrs1'
; CHECK: %p
define void @infer_func_attrs1(ptr dereferenceable(8) %p) nofree nosync {
call void @mayfree()
%v = load i32, ptr %p
ret void
}
; CHECK-LABEL: 'infer_func_attrs2'
; GLOBAL: %p
; POINT-NOT: %p
; FIXME: Can be inferred from attributes
define void @infer_func_attrs2(ptr dereferenceable(8) %p) readonly {
call void @mayfree()
%v = load i32, ptr %p
ret void
}
; CHECK-LABEL: 'infer_noalias1'
; GLOBAL: %p
; POINT-NOT: %p
; FIXME: Can be inferred from attributes
define void @infer_noalias1(ptr dereferenceable(8) noalias nofree %p) {
call void @mayfree()
%v = load i32, ptr %p
ret void
}
; CHECK-LABEL: 'infer_noalias2'
; GLOBAL: %p
; POINT-NOT: %p
; FIXME: Can be inferred from attributes
define void @infer_noalias2(ptr dereferenceable(8) noalias readonly %p) nosync {
call void @mayfree()
%v = load i32, ptr %p
ret void
}
; Just check that we don't crash.
; CHECK-LABEL: 'opaque_type_crasher'
define void @opaque_type_crasher(ptr dereferenceable(16) %a, i1 %arg) {
entry:
%ptr8 = getelementptr inbounds i8, ptr %a, i32 8
br i1 %arg, label %if.then, label %if.end
if.then:
%res = load i32, ptr %ptr8, align 4
br label %if.end
if.end:
ret void
}
declare token @llvm.experimental.gc.statepoint.p0(i64, i32, ptr, i32, i32, ...)
declare ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token, i32, i32)
declare ptr addrspace(1) @func1(ptr addrspace(1) returned) nounwind argmemonly
; Can free any object accessible in memory
declare void @mayfree()
!0 = !{i64 4}
!1 = !{i64 2}
!2 = !{}
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