30001af84e
When determining NoAlias based on object size and dereferenceability information, we can ignore frees for the same reason we can ignore possible null pointers (if null is not a valid pointer): Actually accessing the null pointer / freed pointer would be immediate UB, and AA results are only valid under the assumption of an access. This addresses a minor regression from D110745. Differential Revision: https://reviews.llvm.org/D111028
151 lines
5.0 KiB
LLVM
151 lines
5.0 KiB
LLVM
; RUN: opt -basic-aa -print-all-alias-modref-info -aa-eval < %s 2>&1 | FileCheck %s
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; RUN: opt -basic-aa -print-all-alias-modref-info -aa-eval -use-dereferenceable-at-point-semantics=1 < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@G = global i32 0, align 4
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define i64 @global_and_deref_arg_1(i64* dereferenceable(8) %arg) nofree nosync {
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; CHECK: Function: global_and_deref_arg_1: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* @G, i64* %arg
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bb:
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store i64 1, i64* %arg, align 8
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store i32 0, i32* @G, align 4
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%tmp = load i64, i64* %arg, align 8
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ret i64 %tmp
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}
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define i32 @global_and_deref_arg_2(i32* dereferenceable(8) %arg) nofree nosync {
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; CHECK: Function: global_and_deref_arg_2: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* %arg, i32* @G
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bb:
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store i32 1, i32* %arg, align 8
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store i32 0, i32* @G, align 4
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%tmp = load i32, i32* %arg, align 8
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ret i32 %tmp
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}
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define i32 @byval_and_deref_arg_1(i32* byval(i32) %obj, i64* dereferenceable(8) %arg) nofree nosync {
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; CHECK: Function: byval_and_deref_arg_1: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* %obj, i64* %arg
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bb:
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store i32 1, i32* %obj, align 4
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store i64 0, i64* %arg, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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define i32 @byval_and_deref_arg_2(i32* byval(i32) %obj, i32* dereferenceable(8) %arg) nofree nosync {
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; CHECK: Function: byval_and_deref_arg_2: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* %arg, i32* %obj
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bb:
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store i32 1, i32* %obj, align 4
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store i32 0, i32* %arg, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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declare dereferenceable(8) i32* @get_i32_deref8()
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declare dereferenceable(8) i64* @get_i64_deref8()
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declare void @unknown(i32*)
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define i32 @local_and_deref_ret_1() {
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; CHECK: Function: local_and_deref_ret_1: 2 pointers, 2 call sites
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; CHECK-NEXT: NoAlias: i32* %obj, i64* %ret
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bb:
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%obj = alloca i32
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call void @unknown(i32* %obj)
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%ret = call dereferenceable(8) i64* @get_i64_deref8()
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store i32 1, i32* %obj, align 4
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store i64 0, i64* %ret, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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define i32 @local_and_deref_ret_2() {
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; CHECK: Function: local_and_deref_ret_2: 2 pointers, 2 call sites
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; CHECK-NEXT: NoAlias: i32* %obj, i32* %ret
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bb:
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%obj = alloca i32
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call void @unknown(i32* %obj)
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%ret = call dereferenceable(8) i32* @get_i32_deref8()
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store i32 1, i32* %obj, align 4
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store i32 0, i32* %ret, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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; Baseline tests, same as above but with 2 instead of 8 dereferenceable bytes.
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define i64 @global_and_deref_arg_non_deref_1(i64* dereferenceable(2) %arg) nofree nosync {
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; CHECK: Function: global_and_deref_arg_non_deref_1: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* @G, i64* %arg
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bb:
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store i64 1, i64* %arg, align 8
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store i32 0, i32* @G, align 4
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%tmp = load i64, i64* %arg, align 8
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ret i64 %tmp
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}
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define i32 @global_and_deref_arg_non_deref_2(i32* dereferenceable(2) %arg) nofree nosync {
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; CHECK: Function: global_and_deref_arg_non_deref_2: 2 pointers, 0 call sites
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; Different result than above (see @global_and_deref_arg_2).
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; CHECK-NEXT: MayAlias: i32* %arg, i32* @G
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bb:
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store i32 1, i32* %arg, align 8
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store i32 0, i32* @G, align 4
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%tmp = load i32, i32* %arg, align 8
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ret i32 %tmp
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}
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define i32 @byval_and_deref_arg_non_deref_1(i32* byval(i32) %obj, i64* dereferenceable(2) %arg) nofree nosync {
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; CHECK: Function: byval_and_deref_arg_non_deref_1: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* %obj, i64* %arg
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bb:
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store i32 1, i32* %obj, align 4
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store i64 0, i64* %arg, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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define i32 @byval_and_deref_arg_non_deref_2(i32* byval(i32) %obj, i32* dereferenceable(2) %arg) nofree nosync {
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; CHECK: Function: byval_and_deref_arg_non_deref_2: 2 pointers, 0 call sites
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; CHECK-NEXT: NoAlias: i32* %arg, i32* %obj
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bb:
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store i32 1, i32* %obj, align 4
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store i32 0, i32* %arg, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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declare dereferenceable(2) i32* @get_i32_deref2()
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declare dereferenceable(2) i64* @get_i64_deref2()
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define i32 @local_and_deref_ret_non_deref_1() {
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; CHECK: Function: local_and_deref_ret_non_deref_1: 2 pointers, 2 call sites
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; CHECK-NEXT: NoAlias: i32* %obj, i64* %ret
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bb:
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%obj = alloca i32
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call void @unknown(i32* %obj)
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%ret = call dereferenceable(2) i64* @get_i64_deref2()
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store i32 1, i32* %obj, align 4
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store i64 0, i64* %ret, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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define i32 @local_and_deref_ret_non_deref_2() {
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; CHECK: Function: local_and_deref_ret_non_deref_2: 2 pointers, 2 call sites
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; Different result than above (see @local_and_deref_ret_2).
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; CHECK-NEXT: MayAlias: i32* %obj, i32* %ret
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bb:
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%obj = alloca i32
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call void @unknown(i32* %obj)
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%ret = call dereferenceable(2) i32* @get_i32_deref2()
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store i32 1, i32* %obj, align 4
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store i32 0, i32* %ret, align 8
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%tmp = load i32, i32* %obj, align 4
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ret i32 %tmp
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}
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