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; RUN: opt -print-memderefs -analyze -S <%s | FileCheck %s
; Uses the print-deref (+ analyze to print) pass to run
; isDereferenceablePointer() on many load instruction operands
target datalayout = "e"
declare zeroext i1 @return_i1()
@globalstr = global [6 x i8] c"hello\00"
@globali32ptr = external global i32*
%struct.A = type { [8 x i8], [5 x i8] }
@globalstruct = external global %struct.A
define void @test(i32 addrspace(1)* dereferenceable(8) %dparam) gc "statepoint-example" {
; CHECK: The following are dereferenceable:
; CHECK: %globalptr
; CHECK: %alloca
; CHECK: %dparam
; CHECK: %relocate
; CHECK-NOT: %nparam
; CHECK-NOT: %nd_load
; CHECK: %d4_load
; CHECK-NOT: %d2_load
; CHECK-NOT: %d_or_null_load
; CHECK: %d_or_null_non_null_load
; CHECK: %within_allocation
; CHECK-NOT: %outside_allocation
entry:
%globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0
%load1 = load i8, i8* %globalptr
%alloca = alloca i1
%load2 = load i1, i1* %alloca
%load3 = load i32, i32 addrspace(1)* %dparam
%tok = tail call i32 (i64, i32, i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i64 0, i32 0, i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0, i32 addrspace(1)* %dparam)
%relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 7, i32 7)
%load4 = load i32, i32 addrspace(1)* %relocate
%nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5
%load5 = load i32, i32 addrspace(1)* %nparam
; Load from a non-dereferenceable load
%nd_load = load i32*, i32** @globali32ptr
%load6 = load i32, i32* %nd_load
; Load from a dereferenceable load
%d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0
%load7 = load i32, i32* %d4_load
; Load from an offset not covered by the dereferenceable portion
%d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1
%load8 = load i32, i32* %d2_load
; Load from a potentially null pointer with dereferenceable_or_null
%d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0
%load9 = load i32, i32* %d_or_null_load
; Load from a non-null pointer with dereferenceable_or_null
%d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
%load10 = load i32, i32* %d_or_null_non_null_load
; It's OK to overrun static array size as long as we stay within underlying object size
%within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10
%load11 = load i8, i8* %within_allocation
; GEP is outside the underlying object size
%outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10
%load12 = load i8, i8* %outside_allocation
ret void
}
declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...)
declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
!0 = !{i64 4}
!1 = !{i64 2}
!2 = !{}
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