From 926b44301aa339b7a204f709959ee44b6ee95902 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Tue, 24 Nov 2020 10:00:47 +0100
Subject: Implement Shift Left (WIP)

---
 asm/intel64/encode.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'asm/intel64/encode.cpp')

diff --git a/asm/intel64/encode.cpp b/asm/intel64/encode.cpp
index d3bfd91..6c18d1c 100644
--- a/asm/intel64/encode.cpp
+++ b/asm/intel64/encode.cpp
@@ -6,6 +6,7 @@
 #include "byteorder.h"
 #include "minicc.h"
 
+#include <algorithm>
 #include <exception>
 
 namespace {
@@ -170,6 +171,35 @@ std::vector<std::shared_ptr<Chunk>> makeDivValue(const FlowGraph::Data& data, co
   throw std::runtime_error("ICE: Unsupported type for operand data at div: "s + demangle(typeid(data_storage)));
 }
 
+std::shared_ptr<Op> makeShiftLeftValue(const FlowGraph::Data& data, const FlowGraph::Graph& graph)
+{
+ if (data.type() != FlowGraph::DataType::Int) {
+  throw std::runtime_error("Bad type for operand: "s + std::to_string(int(data.type())));
+ }
+
+ if (!data.storage())
+  throw std::runtime_error("ICE: Operand storage is 0");
+
+ auto& data_storage{*data.storage()};
+ if (typeid(data_storage) == typeid(FlowGraph::Constant)) {
+  FlowGraph::Constant& value {dynamic_cast<FlowGraph::Constant&>(data_storage)};
+  if (value.value().size() < sizeof(uint32_t))
+   throw std::runtime_error("ICE: Int data from operand needs at least 4 bytes, got "s + std::to_string(value.value().size()));
+
+  uint32_t immediate = endian::from_little32(value.value());
+  immediate = std::min(immediate, uint32_t(0xFF));
+
+  return makeOp("shl", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Immediate8(static_cast<uint8_t>(immediate))}});
+ } else if (typeid(data_storage) == typeid(FlowGraph::TemporaryStorage)) {
+  //FlowGraph::TemporaryStorage& storage {dynamic_cast<FlowGraph::TemporaryStorage&>(data_storage)};
+
+  index_t index { graph.scope()->indexOfData(data)};
+  // makeOp("mov", Asm::Args{{Asm::Args::Register32("ecx"), Asm::Args::Mem32Ptr64("rbp", int32_t(index + 1) * -4)}}); // TODO: return list of ops; limit ecx to 0xff; implement shr x, cl
+  return makeOp("nop");//makeOp("shl", Asm::Args{{Asm::Args::Register32("eax"), Asm::Args::Register8("cl")}});
+ } else
+  throw std::runtime_error("ICE: Unsupported type for operand data at shift left: "s + demangle(typeid(data_storage)));
+}
+
 } // namespace
 
 void Asm::toMachineCode(const FlowGraph::Graph& graph, Segment& segment)
@@ -238,6 +268,10 @@ void Asm::toMachineCode(const FlowGraph::Graph& graph, Segment& segment)
      segment.append(makeDivValue(operands[2], graph));
      segment.append(parseAsm("mov eax, edx")); // remainder is in edx
      segment.push_back(makeStoreValue(operands[0], graph));
+    } else if (op.type() == FlowGraph::BinaryOperationType::ShiftLeft) {
+     segment.push_back(makeLoadValue(operands[1], graph));
+     segment.push_back(makeShiftLeftValue(operands[2], graph));
+     segment.push_back(makeStoreValue(operands[0], graph));
     } else
      throw std::runtime_error("ICE: Asm: Unsupported binary operation type: "s + std::to_string(static_cast<int>(op.type())));
 
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