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Reland "[MLIR][LLVM] Change addressof builders to use opaque pointers" (#69292)

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This relands fbde19a664, which was broken due to incorrect GEP element type creation.

This commit changes the builders of the `llvm.mlir.addressof` operations
to no longer produce typed pointers.

As a consequence, a GPU to NVVM pattern had to be updated, that still
relied on typed pointers.
This commit is contained in:
Christian Ulmann
2023-10-17 11:33:45 +02:00
committed by GitHub
parent 815193f6be
commit 484668c759
5 changed files with 30 additions and 34 deletions
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7
mlir/examples/toy/Ch6/mlir/LowerToLLVM.cpp
View File

@@ -117,8 +117,8 @@ private:
/// * `i32 (i8*, ...)`
static LLVM::LLVMFunctionType getPrintfType(MLIRContext *context) {
auto llvmI32Ty = IntegerType::get(context, 32);
auto llvmI8PtrTy = LLVM::LLVMPointerType::get(IntegerType::get(context, 8));
auto llvmFnType = LLVM::LLVMFunctionType::get(llvmI32Ty, llvmI8PtrTy,
auto llvmPtrTy = LLVM::LLVMPointerType::get(context);
auto llvmFnType = LLVM::LLVMFunctionType::get(llvmI32Ty, llvmPtrTy,
/*isVarArg=*/true);
return llvmFnType;
}
@@ -162,8 +162,7 @@ private:
Value cst0 = builder.create<LLVM::ConstantOp>(loc, builder.getI64Type(),
builder.getIndexAttr(0));
return builder.create<LLVM::GEPOp>(
loc,
LLVM::LLVMPointerType::get(IntegerType::get(builder.getContext(), 8)),
loc, LLVM::LLVMPointerType::get(builder.getContext()), global.getType(),
globalPtr, ArrayRef<Value>({cst0, cst0}));
}
};

7
mlir/examples/toy/Ch7/mlir/LowerToLLVM.cpp
View File

@@ -117,8 +117,8 @@ private:
/// * `i32 (i8*, ...)`
static LLVM::LLVMFunctionType getPrintfType(MLIRContext *context) {
auto llvmI32Ty = IntegerType::get(context, 32);
auto llvmI8PtrTy = LLVM::LLVMPointerType::get(IntegerType::get(context, 8));
auto llvmFnType = LLVM::LLVMFunctionType::get(llvmI32Ty, llvmI8PtrTy,
auto llvmPtrTy = LLVM::LLVMPointerType::get(context);
auto llvmFnType = LLVM::LLVMFunctionType::get(llvmI32Ty, llvmPtrTy,
/*isVarArg=*/true);
return llvmFnType;
}
@@ -162,8 +162,7 @@ private:
Value cst0 = builder.create<LLVM::ConstantOp>(loc, builder.getI64Type(),
builder.getIndexAttr(0));
return builder.create<LLVM::GEPOp>(
loc,
LLVM::LLVMPointerType::get(IntegerType::get(builder.getContext(), 8)),
loc, LLVM::LLVMPointerType::get(builder.getContext()), global.getType(),
globalPtr, ArrayRef<Value>({cst0, cst0}));
}
};

4
mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
View File

@@ -1071,7 +1071,7 @@ def LLVM_AddressOfOp : LLVM_Op<"mlir.addressof",
CArg<"ArrayRef<NamedAttribute>", "{}">:$attrs),
[{
build($_builder, $_state,
LLVM::LLVMPointerType::get(global.getType(), global.getAddrSpace()),
LLVM::LLVMPointerType::get($_builder.getContext(), global.getAddrSpace()),
global.getSymName());
$_state.addAttributes(attrs);
}]>,
@@ -1079,7 +1079,7 @@ def LLVM_AddressOfOp : LLVM_Op<"mlir.addressof",
CArg<"ArrayRef<NamedAttribute>", "{}">:$attrs),
[{
build($_builder, $_state,
LLVM::LLVMPointerType::get(func.getFunctionType()), func.getName());
LLVM::LLVMPointerType::get($_builder.getContext()), func.getName());
$_state.addAttributes(attrs);
}]>
];

18
mlir/lib/Conversion/GPUCommon/GPUOpsLowering.cpp
View File

@@ -441,7 +441,7 @@ LogicalResult GPUPrintfOpToVPrintfLowering::matchAndRewrite(
Location loc = gpuPrintfOp->getLoc();
mlir::Type llvmI8 = typeConverter->convertType(rewriter.getIntegerType(8));
mlir::Type i8Ptr = LLVM::LLVMPointerType::get(llvmI8);
mlir::Type ptrType = LLVM::LLVMPointerType::get(rewriter.getContext());
// Note: this is the GPUModule op, not the ModuleOp that surrounds it
// This ensures that global constants and declarations are placed within
@@ -449,7 +449,7 @@ LogicalResult GPUPrintfOpToVPrintfLowering::matchAndRewrite(
auto moduleOp = gpuPrintfOp->getParentOfType<gpu::GPUModuleOp>();
auto vprintfType =
LLVM::LLVMFunctionType::get(rewriter.getI32Type(), {i8Ptr, i8Ptr});
LLVM::LLVMFunctionType::get(rewriter.getI32Type(), {ptrType, ptrType});
LLVM::LLVMFuncOp vprintfDecl =
getOrDefineFunction(moduleOp, loc, rewriter, "vprintf", vprintfType);
@@ -473,7 +473,8 @@ LogicalResult GPUPrintfOpToVPrintfLowering::matchAndRewrite(
// Get a pointer to the format string's first element
Value globalPtr = rewriter.create<LLVM::AddressOfOp>(loc, global);
Value stringStart = rewriter.create<LLVM::GEPOp>(
loc, i8Ptr, globalPtr, ArrayRef<LLVM::GEPArg>{0, 0});
loc, getTypeConverter()->getPointerType(globalType), globalType,
globalPtr, ArrayRef<LLVM::GEPArg>{0, 0});
SmallVector<Type> types;
SmallVector<Value> args;
// Promote and pack the arguments into a stack allocation.
@@ -490,18 +491,17 @@ LogicalResult GPUPrintfOpToVPrintfLowering::matchAndRewrite(
}
Type structType =
LLVM::LLVMStructType::getLiteral(gpuPrintfOp.getContext(), types);
Type structPtrType = LLVM::LLVMPointerType::get(structType);
Value one = rewriter.create<LLVM::ConstantOp>(loc, rewriter.getI64Type(),
rewriter.getIndexAttr(1));
Value tempAlloc = rewriter.create<LLVM::AllocaOp>(loc, structPtrType, one,
/*alignment=*/0);
Value tempAlloc =
rewriter.create<LLVM::AllocaOp>(loc, ptrType, structType, one,
/*alignment=*/0);
for (auto [index, arg] : llvm::enumerate(args)) {
Value ptr = rewriter.create<LLVM::GEPOp>(
loc, LLVM::LLVMPointerType::get(arg.getType()), tempAlloc,
ArrayRef<LLVM::GEPArg>{0, index});
loc, getTypeConverter()->getPointerType(structType), structType,
tempAlloc, ArrayRef<LLVM::GEPArg>{0, index});
rewriter.create<LLVM::StoreOp>(loc, arg, ptr);
}
tempAlloc = rewriter.create<LLVM::BitcastOp>(loc, i8Ptr, tempAlloc);
std::array<Value, 2> printfArgs = {stringStart, tempAlloc};
rewriter.create<LLVM::CallOp>(loc, vprintfDecl, printfArgs);

28
mlir/test/Conversion/GPUToNVVM/gpu-to-nvvm.mlir
View File

@@ -542,16 +542,15 @@ gpu.module @test_module_28 {
gpu.module @test_module_29 {
// CHECK-DAG: llvm.mlir.global internal constant @[[$PRINT_GLOBAL0:[A-Za-z0-9_]+]]("Hello, world\0A\00")
// CHECK-DAG: llvm.mlir.global internal constant @[[$PRINT_GLOBAL1:[A-Za-z0-9_]+]]("Hello: %d\0A\00")
// CHECK-DAG: llvm.func @vprintf(!llvm.ptr<i8>, !llvm.ptr<i8>) -> i32
// CHECK-DAG: llvm.func @vprintf(!llvm.ptr, !llvm.ptr) -> i32
// CHECK-LABEL: func @test_const_printf
gpu.func @test_const_printf() {
// CHECK-NEXT: %[[FORMATSTR:.*]] = llvm.mlir.addressof @[[$PRINT_GLOBAL0]] : !llvm.ptr<array<14 x i8>>
// CHECK-NEXT: %[[FORMATSTART:.*]] = llvm.getelementptr %[[FORMATSTR]][0, 0] : (!llvm.ptr<array<14 x i8>>) -> !llvm.ptr<i8>
// CHECK-NEXT: %[[FORMATSTR:.*]] = llvm.mlir.addressof @[[$PRINT_GLOBAL0]] : !llvm.ptr
// CHECK-NEXT: %[[FORMATSTART:.*]] = llvm.getelementptr %[[FORMATSTR]][0, 0] : (!llvm.ptr) -> !llvm.ptr, !llvm.array<14 x i8>
// CHECK-NEXT: %[[O:.*]] = llvm.mlir.constant(1 : index) : i64
// CHECK-NEXT: %[[ALLOC:.*]] = llvm.alloca %[[O]] x !llvm.struct<()> : (i64) -> !llvm.ptr<struct<()>>
// CHECK-NEXT: %[[ARGPTR:.*]] = llvm.bitcast %[[ALLOC]] : !llvm.ptr<struct<()>> to !llvm.ptr<i8>
// CHECK-NEXT: llvm.call @vprintf(%[[FORMATSTART]], %[[ARGPTR]]) : (!llvm.ptr<i8>, !llvm.ptr<i8>) -> i32
// CHECK-NEXT: %[[ALLOC:.*]] = llvm.alloca %[[O]] x !llvm.struct<()> : (i64) -> !llvm.ptr
// CHECK-NEXT: llvm.call @vprintf(%[[FORMATSTART]], %[[ALLOC]]) : (!llvm.ptr, !llvm.ptr) -> i32
gpu.printf "Hello, world\n"
gpu.return
}
@@ -559,17 +558,16 @@ gpu.module @test_module_29 {
// CHECK-LABEL: func @test_printf
// CHECK: (%[[ARG0:.*]]: i32, %[[ARG1:.*]]: f32)
gpu.func @test_printf(%arg0: i32, %arg1: f32) {
// CHECK-NEXT: %[[FORMATSTR:.*]] = llvm.mlir.addressof @[[$PRINT_GLOBAL1]] : !llvm.ptr<array<11 x i8>>
// CHECK-NEXT: %[[FORMATSTART:.*]] = llvm.getelementptr %[[FORMATSTR]][0, 0] : (!llvm.ptr<array<11 x i8>>) -> !llvm.ptr<i8>
// CHECK-NEXT: %[[FORMATSTR:.*]] = llvm.mlir.addressof @[[$PRINT_GLOBAL1]] : !llvm.ptr
// CHECK-NEXT: %[[FORMATSTART:.*]] = llvm.getelementptr %[[FORMATSTR]][0, 0] : (!llvm.ptr) -> !llvm.ptr, !llvm.array<11 x i8>
// CHECK-NEXT: %[[EXT:.+]] = llvm.fpext %[[ARG1]] : f32 to f64
// CHECK-NEXT: %[[O:.*]] = llvm.mlir.constant(1 : index) : i64
// CHECK-NEXT: %[[ALLOC:.*]] = llvm.alloca %[[O]] x !llvm.struct<(i32, f64)> : (i64) -> !llvm.ptr<struct<(i32, f64)>>
// CHECK-NEXT: %[[EL0:.*]] = llvm.getelementptr %[[ALLOC]][0, 0] : (!llvm.ptr<struct<(i32, f64)>>) -> !llvm.ptr<i32>
// CHECK-NEXT: llvm.store %[[ARG0]], %[[EL0]] : !llvm.ptr<i32>
// CHECK-NEXT: %[[EL1:.*]] = llvm.getelementptr %[[ALLOC]][0, 1] : (!llvm.ptr<struct<(i32, f64)>>) -> !llvm.ptr<f64>
// CHECK-NEXT: llvm.store %[[EXT]], %[[EL1]] : !llvm.ptr<f64>
// CHECK-NEXT: %[[ARGPTR:.*]] = llvm.bitcast %[[ALLOC]] : !llvm.ptr<struct<(i32, f64)>> to !llvm.ptr<i8>
// CHECK-NEXT: llvm.call @vprintf(%[[FORMATSTART]], %[[ARGPTR]]) : (!llvm.ptr<i8>, !llvm.ptr<i8>) -> i32
// CHECK-NEXT: %[[ALLOC:.*]] = llvm.alloca %[[O]] x !llvm.struct<(i32, f64)> : (i64) -> !llvm.ptr
// CHECK-NEXT: %[[EL0:.*]] = llvm.getelementptr %[[ALLOC]][0, 0] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct<(i32, f64)>
// CHECK-NEXT: llvm.store %[[ARG0]], %[[EL0]] : i32, !llvm.ptr
// CHECK-NEXT: %[[EL1:.*]] = llvm.getelementptr %[[ALLOC]][0, 1] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct<(i32, f64)>
// CHECK-NEXT: llvm.store %[[EXT]], %[[EL1]] : f64, !llvm.ptr
// CHECK-NEXT: llvm.call @vprintf(%[[FORMATSTART]], %[[ALLOC]]) : (!llvm.ptr, !llvm.ptr) -> i32
gpu.printf "Hello: %d\n" %arg0, %arg1 : i32, f32
gpu.return
}