[cfe-commits] r149347 - /cfe/trunk/lib/CodeGen/CGDecl.cpp
Chris Lattner
sabre at nondot.org
Mon Jan 30 20:36:20 PST 2012
Author: lattner
Date: Mon Jan 30 22:36:19 2012
New Revision: 149347
URL: http://llvm.org/viewvc/llvm-project?rev=149347&view=rev
Log:
enhance some optimization logic to handle ConstantDataSequential
as well as ConstantArray.
Modified:
cfe/trunk/lib/CodeGen/CGDecl.cpp
Modified: cfe/trunk/lib/CodeGen/CGDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGDecl.cpp?rev=149347&r1=149346&r2=149347&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGDecl.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGDecl.cpp Mon Jan 30 22:36:19 2012
@@ -644,6 +644,16 @@
}
return true;
}
+
+ if (llvm::ConstantDataSequential *CDS =
+ dyn_cast<llvm::ConstantDataSequential>(Init)) {
+ for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
+ llvm::Constant *Elt = CDS->getElementAsConstant(i);
+ if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
+ return false;
+ }
+ return true;
+ }
// Anything else is hard and scary.
return false;
@@ -654,17 +664,26 @@
/// stores that would be required.
static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
bool isVolatile, CGBuilderTy &Builder) {
- // Zero doesn't require any stores.
- if (isa<llvm::ConstantAggregateZero>(Init) ||
- isa<llvm::ConstantPointerNull>(Init) ||
- isa<llvm::UndefValue>(Init))
+ // Zero doesn't require a store.
+ if (Init->isNullValue() || isa<llvm::UndefValue>(Init))
return;
if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
isa<llvm::ConstantExpr>(Init)) {
- if (!Init->isNullValue())
- Builder.CreateStore(Init, Loc, isVolatile);
+ Builder.CreateStore(Init, Loc, isVolatile);
+ return;
+ }
+
+ if (llvm::ConstantDataSequential *CDS =
+ dyn_cast<llvm::ConstantDataSequential>(Init)) {
+ for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
+ llvm::Constant *Elt = CDS->getElementAsConstant(i);
+
+ // Get a pointer to the element and emit it.
+ emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
+ isVolatile, Builder);
+ }
return;
}
@@ -673,9 +692,7 @@
for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
- if (Elt->isNullValue()) continue;
-
- // Otherwise, get a pointer to the element and emit it.
+ // Get a pointer to the element and emit it.
emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
isVolatile, Builder);
}
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