diff --git a/include/triton/Dialect/Triton/IR/TritonAttrDefs.td b/include/triton/Dialect/Triton/IR/TritonAttrDefs.td
new file mode 100644
index 000000000..ac50d2d1a
--- /dev/null
+++ b/include/triton/Dialect/Triton/IR/TritonAttrDefs.td
@@ -0,0 +1,59 @@
+#ifndef TRITON_ATTR_DEFS
+#define TRITON_ATTR_DEFS
+
+include "mlir/IR/EnumAttr.td"
+
+// Attrs for LoadOp
+def TT_CacheModifierAttr : I32EnumAttr<
+    "CacheModifier", "",
+    [
+        I32EnumAttrCase<"NONE", 1, "none">,
+        I32EnumAttrCase<"CA", 2, "ca">,
+        I32EnumAttrCase<"CG", 3, "cg">,
+    ]> {
+    let cppNamespace = "::mlir::triton";
+}
+def TT_EvictionPolicyAttr : I32EnumAttr<
+    "EvictionPolicy", "",
+    [
+        I32EnumAttrCase<"NORMAL", 1, "normal">,
+        I32EnumAttrCase<"EVICT_FIRST", 2, "evict_first">,
+        I32EnumAttrCase<"EVICT_LAST", 3, "evict_last">
+    ]> {
+    let cppNamespace = "::mlir::triton";
+}
+
+// reduction
+def TT_RedOpAttr : I32EnumAttr<
+    /*name*/"RedOp", /*summary*/"",
+    /*case*/
+    [
+        I32EnumAttrCase</*sym*/"ADD", 1, /*str*/"add">,
+        I32EnumAttrCase<"MAX", 2, "max">,
+        I32EnumAttrCase<"MIN", 3, "min">,
+        I32EnumAttrCase<"FADD", 4, "fadd">,
+        I32EnumAttrCase<"FMAX", 5, "fmax">,
+        I32EnumAttrCase<"FMIN", 6, "fmin">,
+        I32EnumAttrCase<"XOR", 7, "xor">
+    ]> {
+    let cppNamespace = "::mlir::triton";
+}
+
+// atomic
+def TT_AtomicRMWAttr : I32EnumAttr<
+    "RMWOp", "",
+    [
+        I32EnumAttrCase<"AND", 1, "and">,
+        I32EnumAttrCase<"OR", 2, "or">,
+        I32EnumAttrCase<"XOR", 3, "xor">,
+        I32EnumAttrCase<"ADD", 4, "add">,
+        I32EnumAttrCase<"FADD", 5, "fadd">,
+        I32EnumAttrCase<"MAX", 6, "max">,
+        I32EnumAttrCase<"MIN", 7, "min">,
+        I32EnumAttrCase<"UMAX", 8, "umax">,
+        I32EnumAttrCase<"UMIN", 9, "umin">
+    ]> {
+    let cppNamespace = "::mlir::triton";
+}
+
+#endif
diff --git a/lib/Dialect/TritonGPU/Transforms/Combine.cpp b/lib/Dialect/TritonGPU/Transforms/Combine.cpp
new file mode 100644
index 000000000..ada418f5c
--- /dev/null
+++ b/lib/Dialect/TritonGPU/Transforms/Combine.cpp
@@ -0,0 +1,50 @@
+#include "mlir/IR/BuiltinAttributes.h"
+#include "mlir/IR/Matchers.h"
+#include "mlir/IR/PatternMatch.h"
+#include "mlir/Pass/Pass.h"
+#include "mlir/Support/LogicalResult.h"
+#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
+
+#include "triton/Dialect/TritonGPU/IR/Dialect.h"
+#include "triton/Dialect/TritonGPU/Transforms/Passes.h"
+
+#include <memory>
+
+using namespace mlir;
+
+static bool isSharedLayout(Value v) {
+  if (auto tensorType = v.getType().dyn_cast<RankedTensorType>()) {
+    Attribute encoding = tensorType.getEncoding();
+    return encoding.isa<triton::gpu::TritonGPUSharedEncodingAttr>();
+  }
+  return false;
+}
+
+namespace {
+#include "TritonGPUCombine.inc"
+}
+
+#define GEN_PASS_CLASSES
+#include "triton/Dialect/TritonGPU/Transforms/Passes.h.inc"
+
+class TritonGPUCombineOpsPass 
+  : public TritonGPUCombineOpsBase<TritonGPUCombineOpsPass> {
+public:
+  void runOnOperation() override {
+    MLIRContext *context = &getContext();
+    ModuleOp m = getOperation();
+
+    mlir::RewritePatternSet patterns(context);
+
+    patterns.add<ConvertLayoutOptPattern>(context);
+    patterns.add<CopyAsyncOptPattern>(context);
+    patterns.add<RedundantConvertLayoutOptPattern>(context);
+
+    if (applyPatternsAndFoldGreedily(m, std::move(patterns)).failed())
+      signalPassFailure();
+  }
+};
+
+std::unique_ptr<Pass> triton::gpu::createCombineOpsPass() {
+  return std::make_unique<TritonGPUCombineOpsPass>();
+}
diff --git a/lib/Dialect/TritonGPU/Transforms/Combine.td b/lib/Dialect/TritonGPU/Transforms/Combine.td
new file mode 100644
index 000000000..4ecd9f73a
--- /dev/null
+++ b/lib/Dialect/TritonGPU/Transforms/Combine.td
@@ -0,0 +1,25 @@
+#ifndef TRITONGPU_PATTERNS
+#define TRITONGPU_PATTERNS
+
+include "triton/Dialect/TritonGPU/IR/TritonGPUOps.td"
+include "triton/Dialect/Triton/IR/TritonOps.td"
+
+// convert_layout(load(...), #L) => copy_async(...); barrier 
+//   if #L is smem_layout
+def CopyAsyncOptPattern : Pat<
+  (TTG_ConvertLayoutOp:$res (TT_LoadOp $ptr, $mask, $other, $cache, $evict, $isVolatile)),
+  (TTG_CopyAsyncOp $ptr, $mask, $other, $cache, $evict, $isVolatile),
+  [(Constraint<CPred<"isSharedLayout($0)">> $res)]>;
+
+// ConvertLayout(ConvertLayout(x, #L0), #L1) => ConvertLayout(x, #L1)
+def ConvertLayoutOptPattern : Pat<
+  (TTG_ConvertLayoutOp (TTG_ConvertLayoutOp $x)),
+  (TTG_ConvertLayoutOp $x)>;
+
+// TODO: can we replace this with ConvertLayoutOp's folder?
+// ConvertLayout(x, #L) => x if x.layout() == #L
+def RedundantConvertLayoutOptPattern : Pat<
+  (TTG_ConvertLayoutOp:$res $x), (replaceWithValue $x),
+  [(Constraint<CPred<"$0.getType() == $1.getType()">> $res, $x)]>;
+
+#endif