forked from OSchip/llvm-project
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
//===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===//
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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 ARM specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMSubtarget.h"
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#include "ARMGenSubtarget.inc"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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static cl::opt<bool>
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ReserveR9("arm-reserve-r9", cl::Hidden,
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cl::desc("Reserve R9, making it unavailable as GPR"));
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ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
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bool isThumb)
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: ARMArchVersion(V4T)
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, ARMFPUType(None)
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, UseNEONForSinglePrecisionFP(false)
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, IsThumb(isThumb)
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, ThumbMode(Thumb1)
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, IsR9Reserved(ReserveR9)
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, stackAlignment(4)
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, CPUString("generic")
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, TargetType(isELF) // Default to ELF unless otherwise specified.
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, TargetABI(ARM_ABI_APCS) {
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// default to soft float ABI
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if (FloatABIType == FloatABI::Default)
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FloatABIType = FloatABI::Soft;
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// Determine default and user specified characteristics
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// Parse features string.
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CPUString = ParseSubtargetFeatures(FS, CPUString);
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// Set the boolean corresponding to the current target triple, or the default
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// if one cannot be determined, to true.
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unsigned Len = TT.length();
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unsigned Idx = 0;
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if (Len >= 5 && TT.substr(0, 4) == "armv")
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Idx = 4;
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else if (Len >= 6 && TT.substr(0, 5) == "thumb") {
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IsThumb = true;
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if (Len >= 7 && TT[5] == 'v')
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Idx = 6;
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}
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if (Idx) {
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unsigned SubVer = TT[Idx];
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if (SubVer > '4' && SubVer <= '9') {
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if (SubVer >= '7') {
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ARMArchVersion = V7A;
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} else if (SubVer == '6') {
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ARMArchVersion = V6;
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
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ARMArchVersion = V6T2;
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} else if (SubVer == '5') {
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ARMArchVersion = V5T;
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if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
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ARMArchVersion = V5TE;
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}
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if (ARMArchVersion >= V6T2)
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ThumbMode = Thumb2;
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}
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}
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// Thumb2 implies at least V6T2.
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if (ARMArchVersion < V6T2 && ThumbMode >= Thumb2)
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ARMArchVersion = V6T2;
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if (Len >= 10) {
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if (TT.find("-darwin") != std::string::npos)
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// arm-darwin
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TargetType = isDarwin;
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}
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if (TT.find("eabi") != std::string::npos)
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TargetABI = ARM_ABI_AAPCS;
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if (isAAPCS_ABI())
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stackAlignment = 8;
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if (isTargetDarwin())
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IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
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}
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