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- Add "Bitcast" target instruction property for instructions which perform

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nothing more than a bitcast.
- Teach tablegen to automatically infer "Bitcast" property.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127667 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-03-15 05:09:26 +00:00
parent b1a6eab655
commit 0f040a258f
6 changed files with 48 additions and 9 deletions
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46
utils/TableGen/CodeGenDAGPatterns.cpp
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@@ -2288,13 +2288,14 @@ class InstAnalyzer {
const CodeGenDAGPatterns &CDP;
bool &mayStore;
bool &mayLoad;
bool &IsBitcast;
bool &HasSideEffects;
bool &IsVariadic;
public:
InstAnalyzer(const CodeGenDAGPatterns &cdp,
bool &maystore, bool &mayload, bool &hse, bool &isv)
: CDP(cdp), mayStore(maystore), mayLoad(mayload), HasSideEffects(hse),
IsVariadic(isv) {
bool &maystore, bool &mayload, bool &isbc, bool &hse, bool &isv)
: CDP(cdp), mayStore(maystore), mayLoad(mayload), IsBitcast(isbc),
HasSideEffects(hse), IsVariadic(isv) {
}
/// Analyze - Analyze the specified instruction, returning true if the
@@ -2313,6 +2314,29 @@ public:
}
private:
bool IsNodeBitcast(const TreePatternNode *N) const {
if (HasSideEffects || mayLoad || mayStore || IsVariadic)
return false;
if (N->getNumChildren() != 2)
return false;
const TreePatternNode *N0 = N->getChild(0);
if (!N0->isLeaf() || !dynamic_cast<DefInit*>(N0->getLeafValue()))
return false;
const TreePatternNode *N1 = N->getChild(1);
if (N1->isLeaf())
return false;
if (N1->getNumChildren() != 1 || !N1->getChild(0)->isLeaf())
return false;
const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N1->getOperator());
if (OpInfo.getNumResults() != 1 || OpInfo.getNumOperands() != 1)
return false;
return OpInfo.getEnumName() == "ISD::BITCAST";
}
void AnalyzeNode(const TreePatternNode *N) {
if (N->isLeaf()) {
if (DefInit *DI = dynamic_cast<DefInit*>(N->getLeafValue())) {
@@ -2333,8 +2357,10 @@ private:
AnalyzeNode(N->getChild(i));
// Ignore set nodes, which are not SDNodes.
if (N->getOperator()->getName() == "set")
if (N->getOperator()->getName() == "set") {
IsBitcast = IsNodeBitcast(N);
return;
}
// Get information about the SDNode for the operator.
const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N->getOperator());
@@ -2363,12 +2389,13 @@ private:
static void InferFromPattern(const CodeGenInstruction &Inst,
bool &MayStore, bool &MayLoad,
bool &IsBitcast,
bool &HasSideEffects, bool &IsVariadic,
const CodeGenDAGPatterns &CDP) {
MayStore = MayLoad = HasSideEffects = IsVariadic = false;
MayStore = MayLoad = IsBitcast = HasSideEffects = IsVariadic = false;
bool HadPattern =
InstAnalyzer(CDP, MayStore, MayLoad, HasSideEffects, IsVariadic)
InstAnalyzer(CDP, MayStore, MayLoad, IsBitcast, HasSideEffects, IsVariadic)
.Analyze(Inst.TheDef);
// InstAnalyzer only correctly analyzes mayStore/mayLoad so far.
@@ -2714,11 +2741,12 @@ void CodeGenDAGPatterns::InferInstructionFlags() {
CodeGenInstruction &InstInfo =
const_cast<CodeGenInstruction &>(*Instructions[i]);
// Determine properties of the instruction from its pattern.
bool MayStore, MayLoad, HasSideEffects, IsVariadic;
InferFromPattern(InstInfo, MayStore, MayLoad, HasSideEffects, IsVariadic,
*this);
bool MayStore, MayLoad, IsBitcast, HasSideEffects, IsVariadic;
InferFromPattern(InstInfo, MayStore, MayLoad, IsBitcast,
HasSideEffects, IsVariadic, *this);
InstInfo.mayStore = MayStore;
InstInfo.mayLoad = MayLoad;
InstInfo.isBitcast = IsBitcast;
InstInfo.hasSideEffects = HasSideEffects;
InstInfo.Operands.isVariadic = IsVariadic;
}