[CIR] Clean up ptr_stride and its nowrap flag (#1933)

Author: xlauko

clang/include/clang/CIR/Dialect/Builder/CIRBaseBuilder.h

@@ -683,9 +683,9 @@ class CIRBaseBuilderTy : public mlir::OpBuilder {
 
   cir::PtrStrideOp
   createPtrStride(mlir::Location loc, mlir::Value base, mlir::Value stride,
-                  std::optional<CIR_GEPNoWrapFlags> flags = std::nullopt) {
+                  std::optional<GEPNoWrapFlags> flags = std::nullopt) {
     return cir::PtrStrideOp::create(*this, loc, base.getType(), base, stride,
-                                    flags.value_or(CIR_GEPNoWrapFlags::none));
+                                    flags.value_or(GEPNoWrapFlags::none));
   }
 
   cir::CallOp createCallOp(mlir::Location loc,

clang/include/clang/CIR/Dialect/IR/CIROps.td

@@ -406,57 +406,66 @@ def CIR_PtrDiffOp : CIR_Op<"ptr_diff", [Pure, SameTypeOperands]> {
 //===----------------------------------------------------------------------===//
 // PtrStrideOp
 //===----------------------------------------------------------------------===//
+
+// These mirror the GEPNoWrapFlags in LLVM IR Dialect.
 def CIR_GEPNone : I32BitEnumCaseNone<"none">;
 def CIR_GEPInboundsFlag : I32BitEnumCaseBit<"inboundsFlag", 0, "inbounds_flag">;
 def CIR_GEPNusw : I32BitEnumCaseBit<"nusw", 1>;
 def CIR_GEPNuw : I32BitEnumCaseBit<"nuw", 2>;
-def CIR_GEPInbounds
-    : BitEnumCaseGroup<"inbounds", [CIR_GEPInboundsFlag, CIR_GEPNusw]>;
-
-def CIR_GEPNoWrapFlags
-    : CIR_I32BitEnum<"CIR_GEPNoWrapFlags", "::cir::CIR_GEPNoWrapFlags",
-                     [CIR_GEPNone, CIR_GEPInboundsFlag, CIR_GEPNusw, CIR_GEPNuw,
-                      CIR_GEPInbounds]> {
-  let cppNamespace = "::cir";
+def CIR_GEPInbounds : BitEnumCaseGroup<"inbounds", [
+  CIR_GEPInboundsFlag, CIR_GEPNusw]>;
+
+def CIR_GEPNoWrapFlags : CIR_I32BitEnum<"GEPNoWrapFlags", "no-wrap flags", [
+  CIR_GEPNone, 
+  CIR_GEPInboundsFlag, 
+  CIR_GEPNusw, 
+  CIR_GEPNuw,
+  CIR_GEPInbounds
+]> {
   let printBitEnumPrimaryGroups = 1;
 }
 
 def CIR_GEPNoWrapFlagsProp : EnumProp<CIR_GEPNoWrapFlags> {
-  let defaultValue = interfaceType#"::none";
+  let defaultValue = enum.cppType # "::" # "none";
 }
 
 def CIR_PtrStrideOp : CIR_Op<"ptr_stride",[
   Pure, AllTypesMatch<["base", "result"]>
 ]> {
   let summary = "Pointer access with stride";
   let description = [{
-    Given a base pointer as first operand, provides a new pointer after applying
-    a stride (second operand).
-
-    ```mlir
-    %3 = cir.const 0 : i32
-
-    %4 = cir.ptr_stride(%2 : !cir.ptr<i32>, %3 : i32), !cir.ptr<i32>
+    The `cir.ptr_stride` operation computes a new pointer from a base pointer
+    and an integer stride, similar to a single-index `getelementptr` in LLVM IR.
+    It moves the pointer by `stride * sizeof(element_type)` bytes.
 
-    %5 = cir.ptr_stride(%2 : !cir.ptr<i32>, %3 : i32, inbounds), !cir.ptr<i32>
+    Optional no-wrap flags refine pointer arithmetic semantics, that mirror
+    LLVM's GEP no-wrap semantics.
 
-    %6 = cir.ptr_stride(%2 : !cir.ptr<i32>, %3 : i32, inbounds|nuw), !cir.ptr<i32>
+    Example:
 
+    ```mlir
+    %3 = cir.ptr_stride %1, %2 : (!cir.ptr<i32>, i32) ->!cir.ptr<i32>
+    %4 = cir.ptr_stride inbounds %1, %2 : (!cir.ptr<i32>, i32) -> !cir.ptr<i32>
+    %5 = cir.ptr_stride inbounds|nuw %1, %2 : (!cir.ptr<i32>, i32) -> !cir.ptr<i32>
     ```
   }];
 
-  let arguments = (ins CIR_PointerType:$base, CIR_AnyFundamentalIntType:$stride,
-      CIR_GEPNoWrapFlagsProp:$noWrapFlags);
+  let arguments = (ins 
+    CIR_PointerType:$base, 
+    CIR_AnyFundamentalIntType:$stride,
+    CIR_GEPNoWrapFlagsProp:$noWrapFlags
+  );
 
   let results = (outs CIR_PointerType:$result);
 
   let assemblyFormat = [{
-    ($noWrapFlags^)? $base`,` $stride `:` functional-type(operands, results) attr-dict
+    ($noWrapFlags^)? $base`,` $stride `:` functional-type(operands, results) 
+    attr-dict
   }];
 
   let extraClassDeclaration = [{
     // Get type pointed by the base pointer.
-    mlir::Type getElementTy() {
+    mlir::Type getElementType() {
       return getBase().getType().getPointee();
     }
   }];

clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp

@@ -2853,9 +2853,9 @@ mlir::Value CIRGenFunction::emitCheckedInBoundsGEP(
       builder.create<cir::PtrStrideOp>(CGM.getLoc(Loc), PtrTy, Ptr, IdxList[0]);
   // If the pointer overflow sanitizer isn't enabled, do nothing.
   if (!SanOpts.has(SanitizerKind::PointerOverflow)) {
-    cir::CIR_GEPNoWrapFlags nwFlags = cir::CIR_GEPNoWrapFlags::inbounds;
+    cir::GEPNoWrapFlags nwFlags = cir::GEPNoWrapFlags::inbounds;
     if (!SignedIndices && !IsSubtraction)
-      nwFlags = nwFlags | cir::CIR_GEPNoWrapFlags::nuw;
+      nwFlags = nwFlags | cir::GEPNoWrapFlags::nuw;
     return builder.create<cir::PtrStrideOp>(CGM.getLoc(Loc), PtrTy, Ptr,
                                             IdxList[0], nwFlags);
   }

clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp

@@ -97,17 +97,15 @@ void walkRegionSkipping(mlir::Region &region,
 
 /// Convert from a CIR PtrStrideOp kind to an LLVM IR equivalent of GEP.
 mlir::LLVM::GEPNoWrapFlags
-convertPtrStrideKindToGEPFlags(cir::CIR_GEPNoWrapFlags flags) {
-  using CIRFlags = cir::CIR_GEPNoWrapFlags;
+convertPtrStrideKindToGEPFlags(cir::GEPNoWrapFlags flags) {
+  using CIRFlags = cir::GEPNoWrapFlags;
   using LLVMFlags = mlir::LLVM::GEPNoWrapFlags;
 
   LLVMFlags x = LLVMFlags::none;
   if ((flags & CIRFlags::inboundsFlag) == CIRFlags::inboundsFlag)
     x = x | LLVMFlags::inboundsFlag;
   if ((flags & CIRFlags::nusw) == CIRFlags::nusw)
     x = x | LLVMFlags::nusw;
-  if ((flags & CIRFlags::inbounds) == CIRFlags::inbounds)
-    x = x | LLVMFlags::inbounds;
   if ((flags & CIRFlags::nuw) == CIRFlags::nuw)
     x = x | LLVMFlags::nuw;
   return x;
@@ -1086,7 +1084,7 @@ mlir::LogicalResult CIRToLLVMPtrStrideOpLowering::matchAndRewrite(
   auto *tc = getTypeConverter();
   const auto resultTy = tc->convertType(ptrStrideOp.getType());
   auto elementTy =
-      convertTypeForMemory(*tc, dataLayout, ptrStrideOp.getElementTy());
+      convertTypeForMemory(*tc, dataLayout, ptrStrideOp.getElementType());
   auto *ctx = elementTy.getContext();
 
   // void and function types doesn't really have a layout to use in GEPs,