Fix array addressing of emulated vector types.

operator[] on a pointer was using the vector register size (16 bytes)
instead of the size of the (emulated) vector type.

Change-Id: Ice8677b41a3af81176fe9495fd02ede9f8b0482f
Reviewed-on: https://swiftshader-review.googlesource.com/8569
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/Reactor/SubzeroReactor.cpp

diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 3187777..7ba4e50 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -140,6 +140,25 @@
 		return reinterpret_cast<BasicBlock*>(b);
 	}
 
+	static size_t typeSize(Type *type)
+	{
+		if(reinterpret_cast<std::intptr_t>(type) & EmulatedBits)
+		{
+			switch(reinterpret_cast<std::intptr_t>(type))
+			{
+			case Type_v2i32: return 8;
+			case Type_v4i16: return 8;
+			case Type_v2i16: return 4;
+			case Type_v8i8:  return 8;
+			case Type_v4i8:  return 4;
+			case Type_v2f32: return 8;
+			default: assert(false);
+			}
+		}
+
+		return Ice::typeWidthInBytes(T(type));
+	}
+
 	Optimization optimization[10] = {InstructionCombining, Disabled};
 
 	using ElfHeader = std::conditional<sizeof(void*) == 8, Elf64_Ehdr, Elf32_Ehdr>::type;
@@ -744,34 +763,12 @@
 
 		if(valueType & EmulatedBits)
 		{
-			switch(valueType)
-			{
-			case Type_v4i8:
-			case Type_v2i16:
-				{
-					const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::LoadSubVector, Ice::Intrinsics::SideEffects_F, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_F};
-					auto target = ::context->getConstantUndef(Ice::IceType_i32);
-					auto load = Ice::InstIntrinsicCall::create(::function, 2, result, target, intrinsic);
-					load->addArg(ptr);
-					load->addArg(::context->getConstantInt32(4));
-					::basicBlock->appendInst(load);
-				}
-				break;
-			case Type_v2i32:
-			case Type_v8i8:
-			case Type_v4i16:
-			case Type_v2f32:
-				{
-					const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::LoadSubVector, Ice::Intrinsics::SideEffects_F, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_F};
-					auto target = ::context->getConstantUndef(Ice::IceType_i32);
-					auto load = Ice::InstIntrinsicCall::create(::function, 2, result, target, intrinsic);
-					load->addArg(ptr);
-					load->addArg(::context->getConstantInt32(8));
-					::basicBlock->appendInst(load);
-				}
-				break;
-			default: assert(false && "UNIMPLEMENTED");
-			}
+			const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::LoadSubVector, Ice::Intrinsics::SideEffects_F, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_F};
+			auto target = ::context->getConstantUndef(Ice::IceType_i32);
+			auto load = Ice::InstIntrinsicCall::create(::function, 2, result, target, intrinsic);
+			load->addArg(ptr);
+			load->addArg(::context->getConstantInt32(typeSize(type)));
+			::basicBlock->appendInst(load);
 		}
 		else
 		{
@@ -788,36 +785,13 @@
 
 		if(valueType & EmulatedBits)
 		{
-			switch(valueType)
-			{
-			case Type_v4i8:
-			case Type_v2i16:
-				{
-					const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::StoreSubVector, Ice::Intrinsics::SideEffects_T, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_T};
-					auto target = ::context->getConstantUndef(Ice::IceType_i32);
-					auto store = Ice::InstIntrinsicCall::create(::function, 3, nullptr, target, intrinsic);
-					store->addArg(value);
-					store->addArg(ptr);
-					store->addArg(::context->getConstantInt32(4));
-					::basicBlock->appendInst(store);
-				}
-				break;
-			case Type_v2i32:
-			case Type_v8i8:
-			case Type_v4i16:
-			case Type_v2f32:
-				{
-					const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::StoreSubVector, Ice::Intrinsics::SideEffects_T, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_T};
-					auto target = ::context->getConstantUndef(Ice::IceType_i32);
-					auto store = Ice::InstIntrinsicCall::create(::function, 3, nullptr, target, intrinsic);
-					store->addArg(value);
-					store->addArg(ptr);
-					store->addArg(::context->getConstantInt32(8));
-					::basicBlock->appendInst(store);
-				}
-				break;
-			default: assert(false && "UNIMPLEMENTED");
-			}
+			const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::StoreSubVector, Ice::Intrinsics::SideEffects_T, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_T};
+			auto target = ::context->getConstantUndef(Ice::IceType_i32);
+			auto store = Ice::InstIntrinsicCall::create(::function, 3, nullptr, target, intrinsic);
+			store->addArg(value);
+			store->addArg(ptr);
+			store->addArg(::context->getConstantInt32(typeSize(type)));
+			::basicBlock->appendInst(store);
 		}
 		else
 		{
@@ -836,7 +810,7 @@
 
 		if(auto *constant = llvm::dyn_cast<Ice::ConstantInteger32>(index))
 		{
-			int32_t offset = constant->getValue() * (int)Ice::typeWidthInBytes(T(type));
+			int32_t offset = constant->getValue() * (int)typeSize(type);
 
 			if(offset == 0)
 			{
@@ -848,7 +822,7 @@
 
 		if(!Ice::isByteSizedType(T(type)))
 		{
-			index = createMul(index, createConstantInt((int)Ice::typeWidthInBytes(T(type))));
+			index = createMul(index, createConstantInt((int)typeSize(type)));
 		}
 
 		if(sizeof(void*) == 8)