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When AA is being used, non-aliasing stores are canonicalized to use the same chain, and DAGCombiner::getStoreMergeAndAliasCandidates can take advantage of this by looking only as users of a store's chain operand. However, user iteration is not result-number specific, we need to check that the use is as a chain operand, and not via some other operand. It is certainly possible to have another potentially-aliasing store, which shares the first's base pointer, and uses the first's chain's node via some other operand. Failure to catch this situation caused, at least in the included test case, an assert later because the relative sequence-number ordering caused later replacement to create a cycle in the DAG. llvm-svn: 248698
42 lines
1.8 KiB
LLVM
42 lines
1.8 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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@_ZNSs4_Rep20_S_empty_rep_storageE = external global [0 x i64], align 8
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; Function Attrs: nounwind
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define void @_ZN5clang7tooling15RefactoringTool10runAndSaveEPNS0_21FrontendActionFactoryE() #0 align 2 {
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entry:
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br i1 undef, label %_ZN4llvm18IntrusiveRefCntPtrIN5clang13DiagnosticIDsEEC2EPS2_.exit, label %return
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; CHECK: @_ZN5clang7tooling15RefactoringTool10runAndSaveEPNS0_21FrontendActionFactoryE
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_ZN4llvm18IntrusiveRefCntPtrIN5clang13DiagnosticIDsEEC2EPS2_.exit: ; preds = %entry
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%call2 = call noalias i8* @_Znwm() #3
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%ref_cnt.i.i = bitcast i8* %call2 to i32*
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store <2 x i8*> <i8* bitcast (i64* getelementptr inbounds ([0 x i64], [0 x i64]* @_ZNSs4_Rep20_S_empty_rep_storageE, i64 0, i64 3) to i8*), i8* bitcast (i64* getelementptr inbounds ([0 x i64], [0 x i64]* @_ZNSs4_Rep20_S_empty_rep_storageE, i64 0, i64 3) to i8*)>, <2 x i8*>* undef, align 8
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%IgnoreWarnings.i = getelementptr inbounds i8, i8* %call2, i64 4
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%0 = bitcast i8* %IgnoreWarnings.i to i32*
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call void @llvm.memset.p0i8.i64(i8* null, i8 0, i64 48, i32 8, i1 false) #4
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store i32 251658240, i32* %0, align 4
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store i256 37662610426935100959726589394453639584271499769928088551424, i256* null, align 8
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store i32 1, i32* %ref_cnt.i.i, align 4
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unreachable
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return: ; preds = %entry
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ret void
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}
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; Function Attrs: nobuiltin
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declare noalias i8* @_Znwm() #1
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; Function Attrs: nounwind argmemonly
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #2
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attributes #0 = { nounwind "target-cpu"="pwr7" }
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attributes #1 = { nobuiltin "target-cpu"="pwr7" }
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attributes #2 = { nounwind argmemonly }
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attributes #3 = { builtin nounwind }
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attributes #4 = { nounwind }
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