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Ignore debug intrinsics when computing dependences.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66399 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-03-09 05:12:38 +00:00
parent d7168ddb11
commit f6cec85a4b
1 changed files with 6 additions and 0 deletions
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6
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -18,6 +18,7 @@
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Function.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/ADT/Statistic.h"
@ -121,6 +122,8 @@ getCallSiteDependencyFrom(CallSite CS, bool isReadOnlyCall,
// FreeInsts erase the entire structure
PointerSize = ~0ULL;
} else if (isa<CallInst>(Inst) || isa<InvokeInst>(Inst)) {
// Debug intrinsics don't cause dependences.
if (isa<DbgInfoIntrinsic>(Inst)) break;
CallSite InstCS = CallSite::get(Inst);
// If these two calls do not interfere, look past it.
switch (AA->getModRefInfo(CS, InstCS)) {
@ -175,6 +178,9 @@ getPointerDependencyFrom(Value *MemPtr, uint64_t MemSize, bool isLoad,
while (ScanIt != BB->begin()) {
Instruction *Inst = --ScanIt;
// Debug intrinsics don't cause dependences.
if (isa<DbgInfoIntrinsic>(Inst)) continue;
// Values depend on loads if the pointers are must aliased. This means that
// a load depends on another must aliased load from the same value.
if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {