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experimental support for non-constant [non-static] uniform arrays mapped to addrspace(3)

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This commit is contained in:
Evghenii
2014-01-08 11:06:14 +01:00
parent f0b49995e5
commit 0a66f17897
5 changed files with 100 additions and 46 deletions
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52
stmt.cpp
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@@ -260,44 +260,36 @@ DeclStmt::EmitCode(FunctionEmitContext *ctx) const {
if (sym->type->IsArrayType() && sym->type->IsUniformType()
&& g->target->getISA() == Target::NVPTX)
{
#if 0 /* need to test if initializer works ... */
if (initExpr != NULL)
Error(initExpr->pos, "Initializer for static variable "
"\"%s\" must be a constant.", sym->name.c_str());
#endif
Error(initExpr->pos,
"It is not possible to initialize \"uniform\" array \"%s\" with \"nvptx\" target. "
"Use \"varying\" or \"const static uniform\" if possible.",
sym->name.c_str());
PerformanceWarning(sym->pos,
"\"uniform\" arrays may be slow with \"nvptx\" target. Use \"varying\" if possible.");
"\"uniform\" arrays might be slow with \"nvptx\" target."
" Unless data sharing between program instances is required, use \"varying\" instead.");
llvm::Constant *cinit = NULL;
if (initExpr != NULL)
{
if (PossiblyResolveFunctionOverloads(initExpr, sym->type) == false)
continue;
// FIXME: we only need this for function pointers; it was
// already done for atomic types and enums in
// DeclStmt::TypeCheck()...
if (dynamic_cast<ExprList *>(initExpr) == NULL) {
initExpr = TypeConvertExpr(initExpr, sym->type,
"initializer");
// FIXME: and this is only needed to re-establish
// constant-ness so that GetConstant below works for
// constant artithmetic expressions...
initExpr = ::Optimize(initExpr);
}
const ArrayType *at = CastType<ArrayType>(sym->type);
const int nel = at->GetElementCount();
/* we must scale # elements by 4, because a thread-block will run 4 warps
* or 128 threads.
* ***note-to-me***:please define these value (128threads/4warps)
* in nvptx-target definition
* instead of compile-time constants
*/
const int nel4 = nel*4;
ArrayType nat(at->GetElementType(), nel4);
llvm::Type *llvmType = nat.LLVMType(g->ctx);
cinit = initExpr->GetConstant(sym->type);
}
if (cinit == NULL)
cinit = llvm::Constant::getNullValue(llvmType);
// Allocate space for the static variable in global scope, so
// that it persists across function calls
// addrspace(3) must be undefined at initialization
llvm::Constant *cinit = llvm::UndefValue::get(llvmType);
sym->storagePtr =
new llvm::GlobalVariable(*m->module, llvmType,
sym->type->IsConstType(),
llvm::GlobalValue::InternalLinkage, cinit,
llvm::Twine("local") +
llvm::GlobalValue::PrivateLinkage,
cinit,
llvm::Twine("local_") +
llvm::Twine(sym->pos.first_line) +
llvm::Twine("_") + sym->name.c_str(),
NULL,