c3536b263f
This defines some new target features. These are subsets of existing features that reflect implementation concerns: - "call-indirect-overlong" - implied by "reference-types"; just the overlong encoding for the `call_indirect` immediate, and not the actual reference types. - "bulk-memory-opt" - implied by "bulk-memory": just `memory.copy` and `memory.fill`, and not the other instructions in the bulk-memory proposal. This is split out from https://github.com/llvm/llvm-project/pull/112035. --------- Co-authored-by: Heejin Ahn <aheejin@gmail.com>
69 lines
3.0 KiB
C++
69 lines
3.0 KiB
C++
//===-- WebAssemblySelectionDAGInfo.cpp - WebAssembly SelectionDAG Info ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file implements the WebAssemblySelectionDAGInfo class.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyTargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-selectiondag-info"
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WebAssemblySelectionDAGInfo::~WebAssemblySelectionDAGInfo() = default; // anchor
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SDValue WebAssemblySelectionDAGInfo::EmitTargetCodeForMemcpy(
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SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, Align Alignment, bool IsVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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auto &ST = DAG.getMachineFunction().getSubtarget<WebAssemblySubtarget>();
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if (!ST.hasBulkMemoryOpt())
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return SDValue();
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SDValue MemIdx = DAG.getConstant(0, DL, MVT::i32);
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auto LenMVT = ST.hasAddr64() ? MVT::i64 : MVT::i32;
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// Use `MEMCPY` here instead of `MEMORY_COPY` because `memory.copy` traps
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// if the pointers are invalid even if the length is zero. `MEMCPY` gets
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// extra code to handle this in the way that LLVM IR expects.
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return DAG.getNode(
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WebAssemblyISD::MEMCPY, DL, MVT::Other,
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{Chain, MemIdx, MemIdx, Dst, Src, DAG.getZExtOrTrunc(Size, DL, LenMVT)});
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}
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SDValue WebAssemblySelectionDAGInfo::EmitTargetCodeForMemmove(
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SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Op1, SDValue Op2,
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SDValue Op3, Align Alignment, bool IsVolatile,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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return EmitTargetCodeForMemcpy(DAG, DL, Chain, Op1, Op2, Op3,
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Alignment, IsVolatile, false,
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DstPtrInfo, SrcPtrInfo);
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}
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SDValue WebAssemblySelectionDAGInfo::EmitTargetCodeForMemset(
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SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dst, SDValue Val,
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SDValue Size, Align Alignment, bool IsVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo) const {
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auto &ST = DAG.getMachineFunction().getSubtarget<WebAssemblySubtarget>();
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if (!ST.hasBulkMemoryOpt())
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return SDValue();
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SDValue MemIdx = DAG.getConstant(0, DL, MVT::i32);
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auto LenMVT = ST.hasAddr64() ? MVT::i64 : MVT::i32;
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// Use `MEMSET` here instead of `MEMORY_FILL` because `memory.fill` traps
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// if the pointers are invalid even if the length is zero. `MEMSET` gets
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// extra code to handle this in the way that LLVM IR expects.
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//
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// Only low byte matters for val argument, so anyext the i8
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return DAG.getNode(WebAssemblyISD::MEMSET, DL, MVT::Other, Chain, MemIdx, Dst,
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DAG.getAnyExtOrTrunc(Val, DL, MVT::i32),
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DAG.getZExtOrTrunc(Size, DL, LenMVT));
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}
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