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[nfc] Refactor CGGPUBuiltin to help review D112680

This commit is contained in:
Jon Chesterfield 2021-11-08 14:09:08 +00:00
parent 495e258fd7
commit 2c37ae6d14
1 changed files with 36 additions and 28 deletions
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64
clang/lib/CodeGen/CGGPUBuiltin.cpp
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@ -66,6 +66,41 @@ static llvm::Function *GetVprintfDeclaration(llvm::Module &M) {
//
// Note that by the time this function runs, E's args have already undergone the
// standard C vararg promotion (short -> int, float -> double, etc.).
namespace {
llvm::Value *packArgsIntoNVPTXFormatBuffer(CodeGenFunction *CGF,
const CallArgList &Args) {
const llvm::DataLayout &DL = CGF->CGM.getDataLayout();
llvm::LLVMContext &Ctx = CGF->CGM.getLLVMContext();
CGBuilderTy &Builder = CGF->Builder;
// Construct and fill the args buffer that we'll pass to vprintf.
if (Args.size() <= 1) {
// If there are no args, pass a null pointer to vprintf.
return llvm::ConstantPointerNull::get(llvm::Type::getInt8PtrTy(Ctx));
} else {
llvm::SmallVector<llvm::Type *, 8> ArgTypes;
for (unsigned I = 1, NumArgs = Args.size(); I < NumArgs; ++I)
ArgTypes.push_back(Args[I].getRValue(*CGF).getScalarVal()->getType());
// Using llvm::StructType is correct only because printf doesn't accept
// aggregates. If we had to handle aggregates here, we'd have to manually
// compute the offsets within the alloca -- we wouldn't be able to assume
// that the alignment of the llvm type was the same as the alignment of the
// clang type.
llvm::Type *AllocaTy = llvm::StructType::create(ArgTypes, "printf_args");
llvm::Value *Alloca = CGF->CreateTempAlloca(AllocaTy);
for (unsigned I = 1, NumArgs = Args.size(); I < NumArgs; ++I) {
llvm::Value *P = Builder.CreateStructGEP(AllocaTy, Alloca, I - 1);
llvm::Value *Arg = Args[I].getRValue(*CGF).getScalarVal();
Builder.CreateAlignedStore(Arg, P, DL.getPrefTypeAlign(Arg->getType()));
}
return Builder.CreatePointerCast(Alloca, llvm::Type::getInt8PtrTy(Ctx));
}
}
} // namespace
RValue
CodeGenFunction::EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
ReturnValueSlot ReturnValue) {
@ -73,9 +108,6 @@ CodeGenFunction::EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
assert(E->getBuiltinCallee() == Builtin::BIprintf);
assert(E->getNumArgs() >= 1); // printf always has at least one arg.
const llvm::DataLayout &DL = CGM.getDataLayout();
llvm::LLVMContext &Ctx = CGM.getLLVMContext();
CallArgList Args;
EmitCallArgs(Args,
E->getDirectCallee()->getType()->getAs<FunctionProtoType>(),
@ -90,31 +122,7 @@ CodeGenFunction::EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
return RValue::get(llvm::ConstantInt::get(IntTy, 0));
}
// Construct and fill the args buffer that we'll pass to vprintf.
llvm::Value *BufferPtr;
if (Args.size() <= 1) {
// If there are no args, pass a null pointer to vprintf.
BufferPtr = llvm::ConstantPointerNull::get(llvm::Type::getInt8PtrTy(Ctx));
} else {
llvm::SmallVector<llvm::Type *, 8> ArgTypes;
for (unsigned I = 1, NumArgs = Args.size(); I < NumArgs; ++I)
ArgTypes.push_back(Args[I].getRValue(*this).getScalarVal()->getType());
// Using llvm::StructType is correct only because printf doesn't accept
// aggregates. If we had to handle aggregates here, we'd have to manually
// compute the offsets within the alloca -- we wouldn't be able to assume
// that the alignment of the llvm type was the same as the alignment of the
// clang type.
llvm::Type *AllocaTy = llvm::StructType::create(ArgTypes, "printf_args");
llvm::Value *Alloca = CreateTempAlloca(AllocaTy);
for (unsigned I = 1, NumArgs = Args.size(); I < NumArgs; ++I) {
llvm::Value *P = Builder.CreateStructGEP(AllocaTy, Alloca, I - 1);
llvm::Value *Arg = Args[I].getRValue(*this).getScalarVal();
Builder.CreateAlignedStore(Arg, P, DL.getPrefTypeAlign(Arg->getType()));
}
BufferPtr = Builder.CreatePointerCast(Alloca, llvm::Type::getInt8PtrTy(Ctx));
}
llvm::Value *BufferPtr = packArgsIntoNVPTXFormatBuffer(this, Args);
// Invoke vprintf and return.
llvm::Function* VprintfFunc = GetVprintfDeclaration(CGM.getModule());