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Teach memdep to look for memory use intrinsics during dependency queries. Fixes
PR5574. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90045 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -201,7 +201,7 @@ getPointerDependencyFrom(Value *MemPtr, uint64_t MemSize, bool isLoad,
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// If we reach a lifetime begin or end marker, then the query ends here
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// because the value is undefined.
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} else if (II->getIntrinsicID() == Intrinsic::lifetime_start ||
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II->getIntrinsicID() == Intrinsic::lifetime_end) {
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II->getIntrinsicID() == Intrinsic::lifetime_end) {
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uint64_t invariantSize = ~0ULL;
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if (ConstantInt *CI = dyn_cast<ConstantInt>(II->getOperand(1)))
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invariantSize = CI->getZExtValue();
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@ -369,20 +369,41 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
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// calls to free() erase the entire structure, not just a field.
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MemSize = ~0UL;
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} else if (isa<CallInst>(QueryInst) || isa<InvokeInst>(QueryInst)) {
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CallSite QueryCS = CallSite::get(QueryInst);
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bool isReadOnly = AA->onlyReadsMemory(QueryCS);
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LocalCache = getCallSiteDependencyFrom(QueryCS, isReadOnly, ScanPos,
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QueryParent);
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int IntrinsicID = 0; // Intrinsic IDs start at 1.
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if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(QueryInst))
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IntrinsicID = II->getIntrinsicID();
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switch (IntrinsicID) {
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end:
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case Intrinsic::invariant_start:
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MemPtr = QueryInst->getOperand(2);
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MemSize = cast<ConstantInt>(QueryInst->getOperand(1))->getZExtValue();
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break;
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case Intrinsic::invariant_end:
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MemPtr = QueryInst->getOperand(3);
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MemSize = cast<ConstantInt>(QueryInst->getOperand(2))->getZExtValue();
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break;
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default:
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CallSite QueryCS = CallSite::get(QueryInst);
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bool isReadOnly = AA->onlyReadsMemory(QueryCS);
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LocalCache = getCallSiteDependencyFrom(QueryCS, isReadOnly, ScanPos,
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QueryParent);
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}
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} else {
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// Non-memory instruction.
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LocalCache = MemDepResult::getClobber(--BasicBlock::iterator(ScanPos));
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}
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// If we need to do a pointer scan, make it happen.
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if (MemPtr)
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LocalCache = getPointerDependencyFrom(MemPtr, MemSize,
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isa<LoadInst>(QueryInst),
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ScanPos, QueryParent);
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if (MemPtr) {
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bool isLoad = !QueryInst->mayWriteToMemory();
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if (IntrinsicInst *II = dyn_cast<MemoryUseIntrinsic>(QueryInst)) {
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isLoad |= II->getIntrinsicID() == Intrinsic::lifetime_end;
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}
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LocalCache = getPointerDependencyFrom(MemPtr, MemSize, isLoad, ScanPos,
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QueryParent);
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}
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// Remember the result!
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if (Instruction *I = LocalCache.getInst())
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@ -1,6 +1,9 @@
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; RUN: opt -S -dse < %s | FileCheck %s
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declare void @llvm.lifetime.end(i64, i8*)
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
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declare void @llvm.memset.i8(i8*, i8, i8, i32)
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define void @test1() {
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@ -17,3 +20,18 @@ define void @test1() {
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ret void
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; CHECK: ret void
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}
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define void @test2(i32* %P) {
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; CHECK: test2
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%Q = getelementptr i32* %P, i32 1
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%R = bitcast i32* %Q to i8*
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call void @llvm.lifetime.start(i64 4, i8* %R)
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; CHECK: lifetime.start
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store i32 0, i32* %Q ;; This store is dead.
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; CHECK-NOT: store
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call void @llvm.lifetime.end(i64 4, i8* %R)
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; CHECK: lifetime.end
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ret void
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}
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