142 lines
5.8 KiB
LLVM
142 lines
5.8 KiB
LLVM
; RUN: opt -print-memderefs -analyze -S <%s | FileCheck %s
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; Uses the print-deref (+ analyze to print) pass to run
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; isDereferenceablePointer() on many load instruction operands
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target datalayout = "e"
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declare zeroext i1 @return_i1()
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declare i32* @foo()
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@globalstr = global [6 x i8] c"hello\00"
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@globali32ptr = external global i32*
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%struct.A = type { [8 x i8], [5 x i8] }
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@globalstruct = external global %struct.A
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@globalptr.align1 = external global i8, align 1
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@globalptr.align16 = external global i8, align 16
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define void @test(i32 addrspace(1)* dereferenceable(8) %dparam,
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i8 addrspace(1)* dereferenceable(32) align 1 %dparam.align1,
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i8 addrspace(1)* dereferenceable(32) align 16 %dparam.align16)
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gc "statepoint-example" {
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; CHECK: The following are dereferenceable:
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entry:
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; CHECK: %globalptr{{.*}}(aligned)
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%globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0
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%load1 = load i8, i8* %globalptr
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; CHECK: %alloca{{.*}}(aligned)
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%alloca = alloca i1
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%load2 = load i1, i1* %alloca
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; CHECK: %dparam{{.*}}(aligned)
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%load3 = load i32, i32 addrspace(1)* %dparam
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; CHECK: %relocate{{.*}}(aligned)
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%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)
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%relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 7, i32 7)
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%load4 = load i32, i32 addrspace(1)* %relocate
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; CHECK-NOT: %nparam
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%nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5
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%load5 = load i32, i32 addrspace(1)* %nparam
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; Load from a non-dereferenceable load
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; CHECK-NOT: %nd_load
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%nd_load = load i32*, i32** @globali32ptr
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%load6 = load i32, i32* %nd_load
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; Load from a dereferenceable load
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; CHECK: %d4_load{{.*}}(aligned)
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%d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0
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%load7 = load i32, i32* %d4_load
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; Load from an offset not covered by the dereferenceable portion
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; CHECK-NOT: %d2_load
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%d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1
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%load8 = load i32, i32* %d2_load
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; Load from a potentially null pointer with dereferenceable_or_null
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; CHECK-NOT: %d_or_null_load
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%d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0
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%load9 = load i32, i32* %d_or_null_load
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; Load from a non-null pointer with dereferenceable_or_null
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; CHECK: %d_or_null_non_null_load{{.*}}(aligned)
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%d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
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%load10 = load i32, i32* %d_or_null_non_null_load
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; It's OK to overrun static array size as long as we stay within underlying object size
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; CHECK: %within_allocation{{.*}}(aligned)
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%within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10
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%load11 = load i8, i8* %within_allocation
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; GEP is outside the underlying object size
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; CHECK-NOT: %outside_allocation
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%outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10
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%load12 = load i8, i8* %outside_allocation
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; Loads from aligned globals
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; CHECK: @globalptr.align1{{.*}}(unaligned)
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; CHECK: @globalptr.align16{{.*}}(aligned)
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%load13 = load i8, i8* @globalptr.align1, align 16
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%load14 = load i8, i8* @globalptr.align16, align 16
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; Loads from aligned arguments
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; CHECK: %dparam.align1{{.*}}(unaligned)
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; CHECK: %dparam.align16{{.*}}(aligned)
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%load15 = load i8, i8 addrspace(1)* %dparam.align1, align 16
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%load16 = load i8, i8 addrspace(1)* %dparam.align16, align 16
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; Loads from aligned allocas
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; CHECK: %alloca.align1{{.*}}(unaligned)
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; CHECK: %alloca.align16{{.*}}(aligned)
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%alloca.align1 = alloca i1, align 1
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%alloca.align16 = alloca i1, align 16
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%load17 = load i1, i1* %alloca.align1, align 16
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%load18 = load i1, i1* %alloca.align16, align 16
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; Loads from GEPs
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; CHECK: %gep.align1.offset1{{.*}}(unaligned)
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; CHECK: %gep.align16.offset1{{.*}}(unaligned)
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; CHECK: %gep.align1.offset16{{.*}}(unaligned)
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; CHECK: %gep.align16.offset16{{.*}}(aligned)
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%gep.align1.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 1
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%gep.align16.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 1
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%gep.align1.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 16
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%gep.align16.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 16
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%load19 = load i8, i8 addrspace(1)* %gep.align1.offset1, align 16
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%load20 = load i8, i8 addrspace(1)* %gep.align16.offset1, align 16
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%load21 = load i8, i8 addrspace(1)* %gep.align1.offset16, align 16
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%load22 = load i8, i8 addrspace(1)* %gep.align16.offset16, align 16
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; CHECK-NOT: %no_deref_return
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; CHECK: %deref_return{{.*}}(unaligned)
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; CHECK: %deref_and_aligned_return{{.*}}(aligned)
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%no_deref_return = call i32* @foo()
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%deref_return = call dereferenceable(32) i32* @foo()
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%deref_and_aligned_return = call dereferenceable(32) align 16 i32* @foo()
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%load23 = load i32, i32* %no_deref_return
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%load24 = load i32, i32* %deref_return, align 16
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%load25 = load i32, i32* %deref_and_aligned_return, align 16
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; Load from a dereferenceable and aligned load
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; CHECK: %d4_unaligned_load{{.*}}(unaligned)
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; CHECK: %d4_aligned_load{{.*}}(aligned)
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%d4_unaligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0
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%d4_aligned_load = load i32*, i32** @globali32ptr, !dereferenceable !0, !align !{i64 16}
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%load26 = load i32, i32* %d4_unaligned_load, align 16
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%load27 = load i32, i32* %d4_aligned_load, align 16
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ret void
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}
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declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...)
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declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
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!0 = !{i64 4}
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!1 = !{i64 2}
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!2 = !{}
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