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10839866a1
This patch implements initial backend support for a -mtune CPU controlled by a "tune-cpu" function attribute. If the attribute is not present X86 will use the resolved CPU from target-cpu attribute or command line. This patch adds MC layer support a tune CPU. Each CPU now has two sets of features stored in their GenSubtargetInfo.inc tables . These features lists are passed separately to the Processor and ProcessorModel classes in tablegen. The tune list defaults to an empty list to avoid changes to non-X86. This annoyingly increases the size of static tables on all target as we now store 24 more bytes per CPU. I haven't quantified the overall impact, but I can if we're concerned. One new test is added to X86 to show a few tuning features with mismatched tune-cpu and target-cpu/target-feature attributes to demonstrate independent control. Another new test is added to demonstrate that the scheduler model follows the tune CPU. I have not added a -mtune to llc/opt or MC layer command line yet. With no attributes we'll just use the -mcpu for both. MC layer tools will always follow the normal CPU for tuning. Differential Revision: https://reviews.llvm.org/D85165
31 lines
1.1 KiB
C++
31 lines
1.1 KiB
C++
//===-- XCoreSubtarget.cpp - XCore Subtarget Information ------------------===//
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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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// This file implements the XCore specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#include "XCoreSubtarget.h"
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#include "XCore.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "xcore-subtarget"
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#define GET_SUBTARGETINFO_TARGET_DESC
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#define GET_SUBTARGETINFO_CTOR
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#include "XCoreGenSubtargetInfo.inc"
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void XCoreSubtarget::anchor() { }
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XCoreSubtarget::XCoreSubtarget(const Triple &TT, const std::string &CPU,
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const std::string &FS, const TargetMachine &TM)
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: XCoreGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), InstrInfo(),
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FrameLowering(*this), TLInfo(TM, *this), TSInfo() {}
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