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https://github.com/c64scene-ar/llvm-6502.git
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642eccbb21
All string occurences for "sparc", "Sparc" and "SPARC" were already replaced, with the exception of ELF constans in the object file descriptor as it will get removed later on (we won't be building ELF object files for the 6502).
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
//===-- Mos6502Subtarget.cpp - MOS6502 Subtarget Information ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MOS6502 specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#include "Mos6502Subtarget.h"
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#include "Mos6502.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "mos6502-subtarget"
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#define GET_SUBTARGETINFO_TARGET_DESC
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#define GET_SUBTARGETINFO_CTOR
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#include "Mos6502GenSubtargetInfo.inc"
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void Mos6502Subtarget::anchor() { }
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Mos6502Subtarget &Mos6502Subtarget::initializeSubtargetDependencies(StringRef CPU,
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StringRef FS) {
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IsV9 = false;
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V8DeprecatedInsts = false;
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IsVIS = false;
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HasHardQuad = false;
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UsePopc = false;
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// Determine default and user specified characteristics
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std::string CPUName = CPU;
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if (CPUName.empty())
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CPUName = (Is64Bit) ? "v9" : "v8";
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// Parse features string.
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ParseSubtargetFeatures(CPUName, FS);
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// Popc is a v9-only instruction.
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if (!IsV9)
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UsePopc = false;
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return *this;
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}
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Mos6502Subtarget::Mos6502Subtarget(const Triple &TT, const std::string &CPU,
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const std::string &FS, TargetMachine &TM,
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bool is64Bit)
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: Mos6502GenSubtargetInfo(TT, CPU, FS), Is64Bit(is64Bit),
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InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
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FrameLowering(*this) {}
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int Mos6502Subtarget::getAdjustedFrameSize(int frameSize) const {
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if (is64Bit()) {
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// All 64-bit stack frames must be 16-byte aligned, and must reserve space
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// for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
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frameSize += 128;
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// Frames with calls must also reserve space for 6 outgoing arguments
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// whether they are used or not. LowerCall_64 takes care of that.
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assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned");
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} else {
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// Emit the correct save instruction based on the number of bytes in
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// the frame. Minimum stack frame size according to V8 ABI is:
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// 16 words for register window spill
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// 1 word for address of returned aggregate-value
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// + 6 words for passing parameters on the stack
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// ----------
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// 23 words * 4 bytes per word = 92 bytes
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frameSize += 92;
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// Round up to next doubleword boundary -- a double-word boundary
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// is required by the ABI.
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frameSize = RoundUpToAlignment(frameSize, 8);
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}
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return frameSize;
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}
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