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df2b9399fe
By using PhiValuesAnalysis we can get all the values reachable from a phi, so we can be more precise instead of giving up when a phi has phi operands. We can't make BaseicAA directly use PhiValuesAnalysis though, as the user of BasicAA may modify the function in ways that PhiValuesAnalysis can't cope with. For this optional usage to work correctly BasicAAWrapperPass now needs to be not marked as CFG-only (i.e. it is now invalidated even when CFG is preserved) due to how the legacy pass manager handles dependent passes being invalidated, namely the depending pass still has a pointer to the now-dead dependent pass. Differential Revision: https://reviews.llvm.org/D44564 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338242 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.8 KiB
LLVM
51 lines
1.8 KiB
LLVM
; RUN: opt -debug-pass=Executions -phi-values -memcpyopt -instcombine -disable-output < %s 2>&1 | FileCheck %s
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; Check that phi values is not run when it's not already available, and that
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; basicaa is freed after a pass that preserves CFG.
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; CHECK: Executing Pass 'Phi Values Analysis'
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; CHECK: Executing Pass 'Basic Alias Analysis (stateless AA impl)'
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; CHECK: Executing Pass 'Memory Dependence Analysis'
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; CHECK: Executing Pass 'MemCpy Optimization'
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; CHECK-DAG: Freeing Pass 'MemCpy Optimization'
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; CHECK-DAG: Freeing Pass 'Phi Values Analysis'
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; CHECK-DAG: Freeing Pass 'Memory Dependence Analysis'
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; CHECK-DAG: Freeing Pass 'Basic Alias Analysis (stateless AA impl)'
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; CHECK-NOT: Executing Pass 'Phi Values Analysis'
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; CHECK: Executing Pass 'Basic Alias Analysis (stateless AA impl)'
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; CHECK: Executing Pass 'Combine redundant instructions'
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declare void @otherfn([4 x i8]*)
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declare i32 @__gxx_personality_v0(...)
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; This function is one where if we didn't free basicaa after memcpyopt then the
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; usage of basicaa in instcombine would cause a segfault due to stale phi-values
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; results being used.
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define void @fn(i8* %this, i64* %ptr) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%arr = alloca [4 x i8], align 8
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%gep1 = getelementptr inbounds [4 x i8], [4 x i8]* %arr, i64 0, i32 0
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br i1 undef, label %then, label %if
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if:
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br label %then
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then:
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%phi = phi i64* [ %ptr, %if ], [ null, %entry ]
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store i8 1, i8* %gep1, align 8
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%load = load i64, i64* %phi, align 8
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%gep2 = getelementptr inbounds i8, i8* undef, i64 %load
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%gep3 = getelementptr inbounds i8, i8* %gep2, i64 40
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invoke i32 undef(i8* undef)
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to label %invoke unwind label %lpad
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invoke:
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unreachable
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lpad:
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landingpad { i8*, i32 }
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catch i8* null
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call void @otherfn([4 x i8]* nonnull %arr)
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unreachable
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}
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