xref: /freebsd-src/contrib/llvm-project/llvm/lib/Target/Sparc/SparcSubtarget.cpp (revision 74626c16ff489c0d64cf2843dfd522e7c544f3ce)
10b57cec5SDimitry Andric //===-- SparcSubtarget.cpp - SPARC Subtarget Information ------------------===//
20b57cec5SDimitry Andric //
30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
60b57cec5SDimitry Andric //
70b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
80b57cec5SDimitry Andric //
90b57cec5SDimitry Andric // This file implements the SPARC specific subclass of TargetSubtargetInfo.
100b57cec5SDimitry Andric //
110b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
120b57cec5SDimitry Andric 
130b57cec5SDimitry Andric #include "SparcSubtarget.h"
140b57cec5SDimitry Andric #include "Sparc.h"
157a6dacacSDimitry Andric #include "llvm/ADT/StringRef.h"
16349cc55cSDimitry Andric #include "llvm/MC/TargetRegistry.h"
170b57cec5SDimitry Andric #include "llvm/Support/MathExtras.h"
180b57cec5SDimitry Andric 
190b57cec5SDimitry Andric using namespace llvm;
200b57cec5SDimitry Andric 
210b57cec5SDimitry Andric #define DEBUG_TYPE "sparc-subtarget"
220b57cec5SDimitry Andric 
230b57cec5SDimitry Andric #define GET_SUBTARGETINFO_TARGET_DESC
240b57cec5SDimitry Andric #define GET_SUBTARGETINFO_CTOR
250b57cec5SDimitry Andric #include "SparcGenSubtargetInfo.inc"
260b57cec5SDimitry Andric 
anchor()270b57cec5SDimitry Andric void SparcSubtarget::anchor() { }
280b57cec5SDimitry Andric 
initializeSubtargetDependencies(StringRef CPU,StringRef TuneCPU,StringRef FS)297a6dacacSDimitry Andric SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(
307a6dacacSDimitry Andric     StringRef CPU, StringRef TuneCPU, StringRef FS) {
310b57cec5SDimitry Andric   // Determine default and user specified characteristics
325ffd83dbSDimitry Andric   std::string CPUName = std::string(CPU);
330b57cec5SDimitry Andric   if (CPUName.empty())
340b57cec5SDimitry Andric     CPUName = (Is64Bit) ? "v9" : "v8";
350b57cec5SDimitry Andric 
367a6dacacSDimitry Andric   if (TuneCPU.empty())
377a6dacacSDimitry Andric     TuneCPU = CPUName;
387a6dacacSDimitry Andric 
390b57cec5SDimitry Andric   // Parse features string.
407a6dacacSDimitry Andric   ParseSubtargetFeatures(CPUName, TuneCPU, FS);
410b57cec5SDimitry Andric 
420b57cec5SDimitry Andric   // Popc is a v9-only instruction.
430b57cec5SDimitry Andric   if (!IsV9)
440b57cec5SDimitry Andric     UsePopc = false;
450b57cec5SDimitry Andric 
460b57cec5SDimitry Andric   return *this;
470b57cec5SDimitry Andric }
480b57cec5SDimitry Andric 
SparcSubtarget(const StringRef & CPU,const StringRef & TuneCPU,const StringRef & FS,const TargetMachine & TM,bool is64Bit)497a6dacacSDimitry Andric SparcSubtarget::SparcSubtarget(const StringRef &CPU, const StringRef &TuneCPU,
507a6dacacSDimitry Andric                                const StringRef &FS, const TargetMachine &TM,
510b57cec5SDimitry Andric                                bool is64Bit)
527a6dacacSDimitry Andric     : SparcGenSubtargetInfo(TM.getTargetTriple(), CPU, TuneCPU, FS),
53*74626c16SDimitry Andric       ReserveRegister(TM.getMCRegisterInfo()->getNumRegs()),
547a6dacacSDimitry Andric       TargetTriple(TM.getTargetTriple()), Is64Bit(is64Bit),
557a6dacacSDimitry Andric       InstrInfo(initializeSubtargetDependencies(CPU, TuneCPU, FS)),
56e8d8bef9SDimitry Andric       TLInfo(TM, *this), FrameLowering(*this) {}
570b57cec5SDimitry Andric 
getAdjustedFrameSize(int frameSize) const580b57cec5SDimitry Andric int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
590b57cec5SDimitry Andric 
600b57cec5SDimitry Andric   if (is64Bit()) {
610b57cec5SDimitry Andric     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
620b57cec5SDimitry Andric     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
630b57cec5SDimitry Andric     frameSize += 128;
640b57cec5SDimitry Andric     // Frames with calls must also reserve space for 6 outgoing arguments
650b57cec5SDimitry Andric     // whether they are used or not. LowerCall_64 takes care of that.
660b57cec5SDimitry Andric     frameSize = alignTo(frameSize, 16);
670b57cec5SDimitry Andric   } else {
680b57cec5SDimitry Andric     // Emit the correct save instruction based on the number of bytes in
690b57cec5SDimitry Andric     // the frame. Minimum stack frame size according to V8 ABI is:
700b57cec5SDimitry Andric     //   16 words for register window spill
710b57cec5SDimitry Andric     //    1 word for address of returned aggregate-value
720b57cec5SDimitry Andric     // +  6 words for passing parameters on the stack
730b57cec5SDimitry Andric     // ----------
740b57cec5SDimitry Andric     //   23 words * 4 bytes per word = 92 bytes
750b57cec5SDimitry Andric     frameSize += 92;
760b57cec5SDimitry Andric 
770b57cec5SDimitry Andric     // Round up to next doubleword boundary -- a double-word boundary
780b57cec5SDimitry Andric     // is required by the ABI.
790b57cec5SDimitry Andric     frameSize = alignTo(frameSize, 8);
800b57cec5SDimitry Andric   }
810b57cec5SDimitry Andric   return frameSize;
820b57cec5SDimitry Andric }
830b57cec5SDimitry Andric 
enableMachineScheduler() const840b57cec5SDimitry Andric bool SparcSubtarget::enableMachineScheduler() const {
850b57cec5SDimitry Andric   return true;
860b57cec5SDimitry Andric }
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