[llvm] r214944 - [dfsan] Try not to create too many additional basic blocks in functions which
Peter Collingbourne
peter at pcc.me.uk
Tue Aug 5 17:33:40 PDT 2014
Author: pcc
Date: Tue Aug 5 19:33:40 2014
New Revision: 214944
URL: http://llvm.org/viewvc/llvm-project?rev=214944&view=rev
Log:
[dfsan] Try not to create too many additional basic blocks in functions which
already have a large number of blocks. Works around a performance issue with
the greedy register allocator.
Added:
llvm/trunk/test/Instrumentation/DataFlowSanitizer/union-large.ll
Modified:
llvm/trunk/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
Modified: llvm/trunk/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp?rev=214944&r1=214943&r2=214944&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp Tue Aug 5 19:33:40 2014
@@ -234,6 +234,7 @@ class DataFlowSanitizer : public ModuleP
FunctionType *DFSanSetLabelFnTy;
FunctionType *DFSanNonzeroLabelFnTy;
Constant *DFSanUnionFn;
+ Constant *DFSanCheckedUnionFn;
Constant *DFSanUnionLoadFn;
Constant *DFSanUnimplementedFn;
Constant *DFSanSetLabelFn;
@@ -280,6 +281,7 @@ struct DFSanFunction {
std::vector<std::pair<PHINode *, PHINode *> > PHIFixups;
DenseSet<Instruction *> SkipInsts;
DenseSet<Value *> NonZeroChecks;
+ bool AvoidNewBlocks;
struct CachedCombinedShadow {
BasicBlock *Block;
@@ -294,6 +296,9 @@ struct DFSanFunction {
IsNativeABI(IsNativeABI), ArgTLSPtr(nullptr), RetvalTLSPtr(nullptr),
LabelReturnAlloca(nullptr) {
DT.recalculate(*F);
+ // FIXME: Need to track down the register allocator issue which causes poor
+ // performance in pathological cases with large numbers of basic blocks.
+ AvoidNewBlocks = F->size() > 1000;
}
Value *getArgTLSPtr();
Value *getArgTLS(unsigned Index, Instruction *Pos);
@@ -577,6 +582,15 @@ bool DataFlowSanitizer::runOnModule(Modu
DFSanUnionFn = Mod->getOrInsertFunction("__dfsan_union", DFSanUnionFnTy);
if (Function *F = dyn_cast<Function>(DFSanUnionFn)) {
+ F->addAttribute(AttributeSet::FunctionIndex, Attribute::NoUnwind);
+ F->addAttribute(AttributeSet::FunctionIndex, Attribute::ReadNone);
+ F->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
+ F->addAttribute(1, Attribute::ZExt);
+ F->addAttribute(2, Attribute::ZExt);
+ }
+ DFSanCheckedUnionFn = Mod->getOrInsertFunction("dfsan_union", DFSanUnionFnTy);
+ if (Function *F = dyn_cast<Function>(DFSanCheckedUnionFn)) {
+ F->addAttribute(AttributeSet::FunctionIndex, Attribute::NoUnwind);
F->addAttribute(AttributeSet::FunctionIndex, Attribute::ReadNone);
F->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
F->addAttribute(1, Attribute::ZExt);
@@ -585,6 +599,7 @@ bool DataFlowSanitizer::runOnModule(Modu
DFSanUnionLoadFn =
Mod->getOrInsertFunction("__dfsan_union_load", DFSanUnionLoadFnTy);
if (Function *F = dyn_cast<Function>(DFSanUnionLoadFn)) {
+ F->addAttribute(AttributeSet::FunctionIndex, Attribute::NoUnwind);
F->addAttribute(AttributeSet::FunctionIndex, Attribute::ReadOnly);
F->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
}
@@ -603,6 +618,7 @@ bool DataFlowSanitizer::runOnModule(Modu
for (Module::iterator i = M.begin(), e = M.end(); i != e; ++i) {
if (!i->isIntrinsic() &&
i != DFSanUnionFn &&
+ i != DFSanCheckedUnionFn &&
i != DFSanUnionLoadFn &&
i != DFSanUnimplementedFn &&
i != DFSanSetLabelFn &&
@@ -922,23 +938,33 @@ Value *DFSanFunction::combineShadows(Val
return CCS.Shadow;
IRBuilder<> IRB(Pos);
- BasicBlock *Head = Pos->getParent();
- Value *Ne = IRB.CreateICmpNE(V1, V2);
- BranchInst *BI = cast<BranchInst>(SplitBlockAndInsertIfThen(
- Ne, Pos, /*Unreachable=*/false, DFS.ColdCallWeights, &DT));
- IRBuilder<> ThenIRB(BI);
- CallInst *Call = ThenIRB.CreateCall2(DFS.DFSanUnionFn, V1, V2);
- Call->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
- Call->addAttribute(1, Attribute::ZExt);
- Call->addAttribute(2, Attribute::ZExt);
-
- BasicBlock *Tail = BI->getSuccessor(0);
- PHINode *Phi = PHINode::Create(DFS.ShadowTy, 2, "", Tail->begin());
- Phi->addIncoming(Call, Call->getParent());
- Phi->addIncoming(V1, Head);
+ if (AvoidNewBlocks) {
+ CallInst *Call = IRB.CreateCall2(DFS.DFSanCheckedUnionFn, V1, V2);
+ Call->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
+ Call->addAttribute(1, Attribute::ZExt);
+ Call->addAttribute(2, Attribute::ZExt);
+
+ CCS.Block = Pos->getParent();
+ CCS.Shadow = Call;
+ } else {
+ BasicBlock *Head = Pos->getParent();
+ Value *Ne = IRB.CreateICmpNE(V1, V2);
+ BranchInst *BI = cast<BranchInst>(SplitBlockAndInsertIfThen(
+ Ne, Pos, /*Unreachable=*/false, DFS.ColdCallWeights, &DT));
+ IRBuilder<> ThenIRB(BI);
+ CallInst *Call = ThenIRB.CreateCall2(DFS.DFSanUnionFn, V1, V2);
+ Call->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
+ Call->addAttribute(1, Attribute::ZExt);
+ Call->addAttribute(2, Attribute::ZExt);
+
+ BasicBlock *Tail = BI->getSuccessor(0);
+ PHINode *Phi = PHINode::Create(DFS.ShadowTy, 2, "", Tail->begin());
+ Phi->addIncoming(Call, Call->getParent());
+ Phi->addIncoming(V1, Head);
- CCS.Block = Tail;
- CCS.Shadow = Phi;
+ CCS.Block = Tail;
+ CCS.Shadow = Phi;
+ }
std::set<Value *> UnionElems;
if (V1Elems != ShadowElements.end()) {
@@ -951,9 +977,9 @@ Value *DFSanFunction::combineShadows(Val
} else {
UnionElems.insert(V2);
}
- ShadowElements[Phi] = std::move(UnionElems);
+ ShadowElements[CCS.Shadow] = std::move(UnionElems);
- return Phi;
+ return CCS.Shadow;
}
// A convenience function which folds the shadows of each of the operands
@@ -1022,7 +1048,7 @@ Value *DFSanFunction::loadShadow(Value *
IRB.CreateAlignedLoad(ShadowAddr1, ShadowAlign), Pos);
}
}
- if (Size % (64 / DFS.ShadowWidth) == 0) {
+ if (!AvoidNewBlocks && Size % (64 / DFS.ShadowWidth) == 0) {
// Fast path for the common case where each byte has identical shadow: load
// shadow 64 bits at a time, fall out to a __dfsan_union_load call if any
// shadow is non-equal.
Added: llvm/trunk/test/Instrumentation/DataFlowSanitizer/union-large.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Instrumentation/DataFlowSanitizer/union-large.ll?rev=214944&view=auto
==============================================================================
--- llvm/trunk/test/Instrumentation/DataFlowSanitizer/union-large.ll (added)
+++ llvm/trunk/test/Instrumentation/DataFlowSanitizer/union-large.ll Tue Aug 5 19:33:40 2014
@@ -0,0 +1,3013 @@
+; RUN: opt < %s -dfsan -S | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+
+; Check that we use dfsan_union in large functions instead of __dfsan_union.
+
+; CHECK-LABEL: @"dfs$foo"
+define i32 @foo(i32 %a, i32 %b) {
+bb0:
+ br label %bb1
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+
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+ br label %bb888
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+bb888:
+ br label %bb889
+
+bb889:
+ br label %bb890
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+ br label %bb891
+
+bb891:
+ br label %bb892
+
+bb892:
+ br label %bb893
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+bb893:
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+
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+
+bb896:
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+
+bb897:
+ br label %bb898
+
+bb898:
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+
+bb899:
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+
+bb900:
+ br label %bb901
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+bb901:
+ br label %bb902
+
+bb902:
+ br label %bb903
+
+bb903:
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+bb904:
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+
+bb905:
+ br label %bb906
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+bb906:
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+bb907:
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+bb908:
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+bb909:
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+
+bb910:
+ br label %bb911
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+bb911:
+ br label %bb912
+
+bb912:
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+bb913:
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+
+bb915:
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+bb916:
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+bb917:
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+bb918:
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+
+bb919:
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+
+bb920:
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+bb921:
+ br label %bb922
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+bb922:
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+bb923:
+ br label %bb924
+
+bb924:
+ br label %bb925
+
+bb925:
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+
+bb926:
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+bb927:
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+
+bb928:
+ br label %bb929
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+bb929:
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+
+bb930:
+ br label %bb931
+
+bb931:
+ br label %bb932
+
+bb932:
+ br label %bb933
+
+bb933:
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+bb934:
+ br label %bb935
+
+bb935:
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+bb937:
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+bb938:
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+
+bb939:
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+bb940:
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+bb941:
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+bb942:
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+bb943:
+ br label %bb944
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+bb944:
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+bb945:
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+bb946:
+ br label %bb947
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+bb947:
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+
+bb948:
+ br label %bb949
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+bb949:
+ br label %bb950
+
+bb950:
+ br label %bb951
+
+bb951:
+ br label %bb952
+
+bb952:
+ br label %bb953
+
+bb953:
+ br label %bb954
+
+bb954:
+ br label %bb955
+
+bb955:
+ br label %bb956
+
+bb956:
+ br label %bb957
+
+bb957:
+ br label %bb958
+
+bb958:
+ br label %bb959
+
+bb959:
+ br label %bb960
+
+bb960:
+ br label %bb961
+
+bb961:
+ br label %bb962
+
+bb962:
+ br label %bb963
+
+bb963:
+ br label %bb964
+
+bb964:
+ br label %bb965
+
+bb965:
+ br label %bb966
+
+bb966:
+ br label %bb967
+
+bb967:
+ br label %bb968
+
+bb968:
+ br label %bb969
+
+bb969:
+ br label %bb970
+
+bb970:
+ br label %bb971
+
+bb971:
+ br label %bb972
+
+bb972:
+ br label %bb973
+
+bb973:
+ br label %bb974
+
+bb974:
+ br label %bb975
+
+bb975:
+ br label %bb976
+
+bb976:
+ br label %bb977
+
+bb977:
+ br label %bb978
+
+bb978:
+ br label %bb979
+
+bb979:
+ br label %bb980
+
+bb980:
+ br label %bb981
+
+bb981:
+ br label %bb982
+
+bb982:
+ br label %bb983
+
+bb983:
+ br label %bb984
+
+bb984:
+ br label %bb985
+
+bb985:
+ br label %bb986
+
+bb986:
+ br label %bb987
+
+bb987:
+ br label %bb988
+
+bb988:
+ br label %bb989
+
+bb989:
+ br label %bb990
+
+bb990:
+ br label %bb991
+
+bb991:
+ br label %bb992
+
+bb992:
+ br label %bb993
+
+bb993:
+ br label %bb994
+
+bb994:
+ br label %bb995
+
+bb995:
+ br label %bb996
+
+bb996:
+ br label %bb997
+
+bb997:
+ br label %bb998
+
+bb998:
+ br label %bb999
+
+bb999:
+ br label %bb1000
+
+bb1000:
+ ; CHECK: call{{.*}}@dfsan_union
+ ; CHECK-NOT: phi
+ %ab = mul i32 %a, %b
+ ret i32 %ab
+}
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