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Disable DAGCombine's alignment inference in "fast" codegen mode.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55059 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-08-20 16:30:28 +00:00
parent b8d2f550b8
commit a267651b7e
3 changed files with 13 additions and 10 deletions
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2
include/llvm/CodeGen/SelectionDAG.h
View File

@ -169,7 +169,7 @@ public:
/// certain types of nodes together, or eliminating superfluous nodes. When
/// the AfterLegalize argument is set to 'true', Combine takes care not to
/// generate any nodes that will be illegal on the target.
void Combine(bool AfterLegalize, AliasAnalysis &AA);
void Combine(bool AfterLegalize, AliasAnalysis &AA, bool Fast);
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
/// only uses types natively supported by the target.

13
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -51,6 +51,7 @@ namespace {
SelectionDAG &DAG;
TargetLowering &TLI;
bool AfterLegalize;
bool Fast;
// Worklist of all of the nodes that need to be simplified.
std::vector<SDNode*> WorkList;
@ -237,10 +238,11 @@ namespace {
SDValue FindBetterChain(SDNode *N, SDValue Chain);
public:
DAGCombiner(SelectionDAG &D, AliasAnalysis &A)
DAGCombiner(SelectionDAG &D, AliasAnalysis &A, bool fast)
: DAG(D),
TLI(D.getTargetLoweringInfo()),
AfterLegalize(false),
Fast(fast),
AA(A) {}
/// Run - runs the dag combiner on all nodes in the work list
@ -4411,7 +4413,7 @@ SDValue DAGCombiner::visitLOAD(SDNode *N) {
SDValue Ptr = LD->getBasePtr();
// Try to infer better alignment information than the load already has.
if (LD->isUnindexed()) {
if (!Fast && LD->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > LD->getAlignment())
return DAG.getExtLoad(LD->getExtensionType(), LD->getValueType(0),
@ -4529,7 +4531,7 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
SDValue Ptr = ST->getBasePtr();
// Try to infer better alignment information than the store already has.
if (ST->isUnindexed()) {
if (!Fast && ST->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > ST->getAlignment())
return DAG.getTruncStore(Chain, Value, Ptr, ST->getSrcValue(),
@ -5664,8 +5666,9 @@ SDValue DAGCombiner::FindBetterChain(SDNode *N, SDValue OldChain) {
// SelectionDAG::Combine - This is the entry point for the file.
//
void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA) {
void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA,
bool Fast) {
/// run - This is the main entry point to this class.
///
DAGCombiner(*this, AA).Run(RunningAfterLegalize);
DAGCombiner(*this, AA, Fast).Run(RunningAfterLegalize);
}

8
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -5369,9 +5369,9 @@ void SelectionDAGISel::CodeGenAndEmitDAG(SelectionDAG &DAG) {
// Run the DAG combiner in pre-legalize mode.
if (TimePassesIsEnabled) {
NamedRegionTimer T("DAG Combining 1", GroupName);
DAG.Combine(false, *AA);
DAG.Combine(false, *AA, Fast);
} else {
DAG.Combine(false, *AA);
DAG.Combine(false, *AA, Fast);
}
DOUT << "Optimized lowered selection DAG:\n";
@ -5413,9 +5413,9 @@ void SelectionDAGISel::CodeGenAndEmitDAG(SelectionDAG &DAG) {
// Run the DAG combiner in post-legalize mode.
if (TimePassesIsEnabled) {
NamedRegionTimer T("DAG Combining 2", GroupName);
DAG.Combine(true, *AA);
DAG.Combine(true, *AA, Fast);
} else {
DAG.Combine(true, *AA);
DAG.Combine(true, *AA, Fast);
}
DOUT << "Optimized legalized selection DAG:\n";