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llvm-mirror/test/Analysis/BasicAA/invariant_group.ll

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[NewPM][BasicAA] basicaa -> basic-aa in Analysis/BasicAA Following https://reviews.llvm.org/D82607. Reviewed By: ychen Differential Revision: https://reviews.llvm.org/D82683
2020-06-26 23:58:01 +02:00
; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
; RUN: opt < %s -basic-aa -gvn -S | FileCheck -check-prefix=CHECK-GVN %s
[BasicAA] Fix handling of invariant group launders Summary: A recent patch ([[ https://reviews.llvm.org/rL331587 | rL331587 ]]) to Capture Tracking taught it that the `launder_invariant_group` intrinsic captures its argument only by returning it. Unfortunately, BasicAA still considered every call instruction as a possible escape source and hence concluded that the result of a `launder_invariant_group` call cannot alias any local non-escaping value. This led to [[ https://bugs.llvm.org/show_bug.cgi?id=37458 | bug 37458 ]]. This patch updates the relevant check for escape sources in BasicAA. Reviewers: Prazek, kuhar, rsmith, hfinkel, sanjoy, xbolva00 Reviewed By: hfinkel, xbolva00 Subscribers: JDevlieghere, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D46900 llvm-svn: 332466
2018-05-16 15:16:54 +02:00
; The input *.ll had been adapted from bug 37458:
;
; struct A { virtual void f(); int n; };
;
; int h() {
; A a;
; a.n = 42;
; return __builtin_launder(&a)->n;
; }
%struct.A = type <{ i8*, i8 }>
; CHECK: testLaunderInvariantGroupIsNotEscapeSource
; CHECK-GVN: testLaunderInvariantGroupIsNotEscapeSource
define i8 @testLaunderInvariantGroupIsNotEscapeSource() {
; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.bitcast
[AA] Updates for D95543. Addressing latter comments in D95543: - `AliasResult::Result` renamed to `AliasResult::Kind` - Offset printing added for `PartialAlias` case in `-aa-eval` - Removed VisitedPhiBBs check from BasicAA' Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D100454
2021-04-13 19:00:12 +02:00
; CHECK-DAG: PartialAlias (off {{[0-9]+}}): %struct.A* %a, i8* %n
[BasicAA] Fix handling of invariant group launders Summary: A recent patch ([[ https://reviews.llvm.org/rL331587 | rL331587 ]]) to Capture Tracking taught it that the `launder_invariant_group` intrinsic captures its argument only by returning it. Unfortunately, BasicAA still considered every call instruction as a possible escape source and hence concluded that the result of a `launder_invariant_group` call cannot alias any local non-escaping value. This led to [[ https://bugs.llvm.org/show_bug.cgi?id=37458 | bug 37458 ]]. This patch updates the relevant check for escape sources in BasicAA. Reviewers: Prazek, kuhar, rsmith, hfinkel, sanjoy, xbolva00 Reviewed By: hfinkel, xbolva00 Subscribers: JDevlieghere, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D46900 llvm-svn: 332466
2018-05-16 15:16:54 +02:00
; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n
; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.laundered
; CHECK-DAG: MustAlias: i8* %a.bitcast, i8* %a.laundered
; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n
[AA] Updates for D95543. Addressing latter comments in D95543: - `AliasResult::Result` renamed to `AliasResult::Kind` - Offset printing added for `PartialAlias` case in `-aa-eval` - Removed VisitedPhiBBs check from BasicAA' Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D100454
2021-04-13 19:00:12 +02:00
; CHECK-DAG: PartialAlias (off {{[0-9]+}}): %struct.A* %a, i8* %n.laundered
[BasicAA] Fix handling of invariant group launders Summary: A recent patch ([[ https://reviews.llvm.org/rL331587 | rL331587 ]]) to Capture Tracking taught it that the `launder_invariant_group` intrinsic captures its argument only by returning it. Unfortunately, BasicAA still considered every call instruction as a possible escape source and hence concluded that the result of a `launder_invariant_group` call cannot alias any local non-escaping value. This led to [[ https://bugs.llvm.org/show_bug.cgi?id=37458 | bug 37458 ]]. This patch updates the relevant check for escape sources in BasicAA. Reviewers: Prazek, kuhar, rsmith, hfinkel, sanjoy, xbolva00 Reviewed By: hfinkel, xbolva00 Subscribers: JDevlieghere, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D46900 llvm-svn: 332466
2018-05-16 15:16:54 +02:00
; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n.laundered
; CHECK-DAG: MustAlias: i8* %n, i8* %n.laundered
; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n.laundered
; CHECK-DAG: NoModRef: Ptr: %struct.A* %a <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
; CHECK-DAG: NoModRef: Ptr: i8* %a.bitcast <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
; CHECK-DAG: NoModRef: Ptr: i8* %n <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
; CHECK-DAG: NoModRef: Ptr: i8* %a.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
; CHECK-DAG: NoModRef: Ptr: i8* %n.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
entry:
%a = alloca %struct.A, align 8
%a.bitcast = bitcast %struct.A* %a to i8*
%n = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 1
store i8 42, i8* %n
%a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
%n.laundered = getelementptr inbounds i8, i8* %a.laundered, i64 8
%v = load i8, i8* %n.laundered
; make sure that the load from %n.laundered to %v aliases the store of 42 to %n
; CHECK-GVN: ret i8 42
ret i8 %v
}
declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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