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|
; RUN: opt -passes=print-memderefs -S < %s -disable-output -use-dereferenceable-at-point-semantics=false 2>&1 | FileCheck %s --check-prefixes=CHECK,GLOBAL
; RUN: opt -passes=print-memderefs -S < %s -disable-output -use-dereferenceable-at-point-semantics 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 = !{}
|
