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c17a17c081
For GEP instructions isDereferenceablePointer checks that all indices are constant and within bounds. Replace this index calculation logic to a call to accumulateConstantOffset. Separated from the http://reviews.llvm.org/D9791 Reviewed By: sanjoy Differential Revision: http://reviews.llvm.org/D9874 llvm-svn: 239299
79 lines
3.0 KiB
LLVM
79 lines
3.0 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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@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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define void @test(i32 addrspace(1)* dereferenceable(8) %dparam) gc "statepoint-example" {
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; CHECK: The following are dereferenceable:
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; CHECK: %globalptr
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; CHECK: %alloca
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; CHECK: %dparam
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; CHECK: %relocate
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; CHECK-NOT: %nparam
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; CHECK-NOT: %nd_load
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; CHECK: %d4_load
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; CHECK-NOT: %d2_load
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; CHECK-NOT: %d_or_null_load
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; CHECK: %d_or_null_non_null_load
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; CHECK: %within_allocation
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; CHECK-NOT: %outside_allocation
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entry:
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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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%alloca = alloca i1
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%load2 = load i1, i1* %alloca
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%load3 = load i32, i32 addrspace(1)* %dparam
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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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%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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%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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%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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%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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%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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%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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%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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%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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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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