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TBAA-enable ArgumentPromotion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-11-11 18:09:32 +00:00
parent fca0b106f7
commit 56653f0df8
2 changed files with 39 additions and 8 deletions
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16
lib/Transforms/IPO/ArgumentPromotion.cpp
View File

@ -39,7 +39,6 @@
#include "llvm/LLVMContext.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
@ -440,8 +439,6 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
SmallPtrSet<BasicBlock*, 16> TranspBlocks;
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
TargetData *TD = getAnalysisIfAvailable<TargetData>();
if (!TD) return false; // Without TargetData, assume the worst.
for (unsigned i = 0, e = Loads.size(); i != e; ++i) {
// Check to see if the load is invalidated from the start of the block to
@ -449,11 +446,11 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
LoadInst *Load = Loads[i];
BasicBlock *BB = Load->getParent();
const PointerType *LoadTy =
cast<PointerType>(Load->getPointerOperand()->getType());
uint64_t LoadSize = TD->getTypeStoreSize(LoadTy->getElementType());
AliasAnalysis::Location Loc(Load->getPointerOperand(),
AA.getTypeStoreSize(Load->getType()),
Load->getMetadata(LLVMContext::MD_tbaa));
if (AA.canInstructionRangeModify(BB->front(), *Load, Arg, LoadSize))
if (AA.canInstructionRangeModify(BB->front(), *Load, Loc))
return false; // Pointer is invalidated!
// Now check every path from the entry block to the load for transparency.
@ -464,7 +461,7 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
for (idf_ext_iterator<BasicBlock*, SmallPtrSet<BasicBlock*, 16> >
I = idf_ext_begin(P, TranspBlocks),
E = idf_ext_end(P, TranspBlocks); I != E; ++I)
if (AA.canBasicBlockModify(**I, Arg, LoadSize))
if (AA.canBasicBlockModify(**I, Loc))
return false;
}
}
@ -700,6 +697,9 @@ CallGraphNode *ArgPromotion::DoPromotion(Function *F,
// of the previous load.
LoadInst *newLoad = new LoadInst(V, V->getName()+".val", Call);
newLoad->setAlignment(OrigLoad->getAlignment());
// Transfer the TBAA info too.
newLoad->setMetadata(LLVMContext::MD_tbaa,
OrigLoad->getMetadata(LLVMContext::MD_tbaa));
Args.push_back(newLoad);
AA.copyValue(OrigLoad, Args.back());
}

31
test/Analysis/TypeBasedAliasAnalysis/argument-promotion.ll Normal file
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@ -0,0 +1,31 @@
; RUN: opt < %s -enable-tbaa -tbaa -basicaa -argpromotion -mem2reg -S | not grep alloca
target datalayout = "E-p:64:64:64"
define internal i32 @test(i32* %X, i32* %Y, i32* %Q) {
store i32 77, i32* %Q, !tbaa !2
%A = load i32* %X, !tbaa !1
%B = load i32* %Y, !tbaa !1
%C = add i32 %A, %B
ret i32 %C
}
define internal i32 @caller(i32* %B, i32* %Q) {
%A = alloca i32
store i32 78, i32* %Q, !tbaa !2
store i32 1, i32* %A, !tbaa !1
%C = call i32 @test(i32* %A, i32* %B, i32* %Q)
ret i32 %C
}
define i32 @callercaller(i32* %Q) {
%B = alloca i32
store i32 2, i32* %B, !tbaa !1
store i32 79, i32* %Q, !tbaa !2
%X = call i32 @caller(i32* %B, i32* %Q)
ret i32 %X
}
!0 = metadata !{metadata !"test"}
!1 = metadata !{metadata !"green", metadata !0}
!2 = metadata !{metadata !"blue", metadata !0}