a6074b092c
BasicAA stores a reference to LoopInfo inside. This imposes an implicit requirement of keeping it up to date whenever we modify the IR (in particular, whenever we modify terminators of blocks that belong to loops). Failing to do so leads to incorrect state of the LoopInfo. Because general AA does not require loop info updates and provides to API to update it properly, the users of AA reasonably assume that there is no need to update the loop info. It may be a reason of bugs, as example in PR43276 shows. This patch drops dependence of BasicAA on LoopInfo to avoid this problem. This may potentially pessimize the result of queries to BasicAA. Differential Revision: https://reviews.llvm.org/D98627 Reviewed By: nikic
88 lines
3.1 KiB
LLVM
88 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -aa-pipeline=basic-aa -passes='require<loops>,jump-threading' | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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target triple = "x86_64-unknown-linux-gnu"
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@global = external global i8*
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define i32 @wibble() {
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; CHECK-LABEL: @wibble(
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; CHECK-NEXT: bb19:
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; CHECK-NEXT: [[TMP20:%.*]] = getelementptr i8, i8* undef, i64 16
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; CHECK-NEXT: [[TMP21:%.*]] = load atomic i8*, i8** @global unordered, align 8
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; CHECK-NEXT: [[TMP22:%.*]] = getelementptr inbounds i8, i8* [[TMP21]], i64 936
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[TMP:%.*]] = phi i8* [ [[TMP22]], [[BB19:%.*]] ], [ undef, [[BB2:%.*]] ]
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; CHECK-NEXT: [[TMP4:%.*]] = phi i8* [ [[TMP21]], [[BB19]] ], [ undef, [[BB2]] ]
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; CHECK-NEXT: [[TMP5:%.*]] = bitcast i8* [[TMP]] to i64*
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; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i8, i8* [[TMP4]], i64 848
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; CHECK-NEXT: [[TMP7:%.*]] = bitcast i8* [[TMP6]] to i8**
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; CHECK-NEXT: br label [[BB11:%.*]]
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; CHECK: bb11:
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; CHECK-NEXT: [[TMP12:%.*]] = load atomic i8*, i8** [[TMP7]] unordered, align 8
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; CHECK-NEXT: [[TMP13:%.*]] = icmp eq i8* [[TMP12]], null
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; CHECK-NEXT: br i1 [[TMP13]], label [[BB17:%.*]], label [[BB16:%.*]]
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; CHECK: bb16:
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; CHECK-NEXT: store atomic i64 undef, i64* [[TMP5]] unordered, align 8
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; CHECK-NEXT: br label [[BB11]]
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; CHECK: bb17:
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; CHECK-NEXT: ret i32 undef
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;
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bb:
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br label %bb1
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bb1: ; preds = %bb
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br label %bb18
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bb2: ; No predecessors!
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br label %bb3
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bb3: ; preds = %bb19, %bb2
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%tmp = phi i8* [ %tmp22, %bb19 ], [ undef, %bb2 ]
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%tmp4 = phi i8* [ %tmp21, %bb19 ], [ undef, %bb2 ]
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%tmp5 = bitcast i8* %tmp to i64*
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%tmp6 = getelementptr inbounds i8, i8* %tmp4, i64 848
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%tmp7 = bitcast i8* %tmp6 to i8**
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br label %bb11
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bb11: ; preds = %bb16, %bb3
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%tmp12 = load atomic i8*, i8** %tmp7 unordered, align 8
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%tmp13 = icmp eq i8* %tmp12, null
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br i1 %tmp13, label %bb17, label %bb14
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bb14: ; preds = %bb11
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br label %bb15
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bb15: ; preds = %bb14
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br label %bb16
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bb16: ; preds = %bb15
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store atomic i64 undef, i64* %tmp5 unordered, align 8
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br label %bb11
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bb17: ; preds = %bb11
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ret i32 undef
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bb18: ; preds = %bb1
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br label %bb19
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bb19: ; preds = %bb18
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%tmp20 = getelementptr i8, i8* undef, i64 16
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%tmp21 = load atomic i8*, i8** @global unordered, align 8
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%tmp22 = getelementptr inbounds i8, i8* %tmp21, i64 936
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br label %bb3
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}
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define void @zot(i8* align 8 dereferenceable_or_null(16) %arg, i32 %arg1) {
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; CHECK-LABEL: @zot(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: ret void
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;
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bb:
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ret void
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}
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