5ce47a5813
A dominance query of a block that is in a different function is ill-defined, so assert that getNode() is only called for blocks that are in the same function. There are three cases, where this behavior did occur. LoopFuse didn't explicitly do this, but didn't invalidate the SCEV block dispositions, leaving dangling pointers to free'ed basic blocks behind, causing use-after-free. We do, however, want to be able to dereference basic blocks inside the dominator tree, so that we can refer to them by a number stored inside the basic block. Reverts #102780 Reland #101198 Fixes #102784 Co-authored-by: Alexis Engelke <engelke@in.tum.de>
34 lines
1.0 KiB
LLVM
34 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes=alignment-from-assumptions -S < %s | FileCheck %s
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; The alignment assumption is a global, which has users in a different
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; function. Test that in this case the dominator tree is only queried with
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; blocks from the same function.
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@global = external constant [192 x i8]
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define void @fn1() {
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; CHECK-LABEL: define void @fn1() {
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; CHECK-NEXT: call void @llvm.assume(i1 false) [ "align"(ptr @global, i64 1) ]
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; CHECK-NEXT: ret void
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;
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call void @llvm.assume(i1 false) [ "align"(ptr @global, i64 1) ]
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ret void
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}
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define void @fn2() {
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; CHECK-LABEL: define void @fn2() {
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; CHECK-NEXT: ret void
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; CHECK: [[LOOP:.*]]:
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr @global, i64 0
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; CHECK-NEXT: [[LOAD:%.*]] = load i64, ptr [[GEP]], align 1
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; CHECK-NEXT: br label %[[LOOP]]
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;
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ret void
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loop:
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%gep = getelementptr inbounds i8, ptr @global, i64 0
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%load = load i64, ptr %gep, align 1
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br label %loop
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}
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