[Triple] Add isThumb and isARM functions.

Summary:
isThumb returns true for Thumb triples (little and big endian), isARM
returns true for ARM triples (little and big endian).
There are a few more checks using arm/thumb that are not covered by
those functions, e.g. that the architecture is either ARM or Thumb
(little endian) or ARM/Thumb little endian only.

Reviewers: javed.absar, rengolin, kristof.beyls, t.p.northover

Reviewed By: rengolin

Subscribers: llvm-commits, aemerson

Differential Revision: https://reviews.llvm.org/D34682

llvm-svn: 310781

Author: fhahn

llvm/include/llvm/ADT/Triple.h

@@ -630,6 +630,16 @@ class Triple {
     return getArch() == Triple::nvptx || getArch() == Triple::nvptx64;
   }
 
+  /// Tests whether the target is Thumb (little and big endian).
+  bool isThumb() const {
+    return getArch() == Triple::thumb || getArch() == Triple::thumbeb;
+  }
+
+  /// Tests whether the target is ARM (little and big endian).
+  bool isARM() const {
+    return getArch() == Triple::arm || getArch() == Triple::armeb;
+  }
+
   /// Tests wether the target supports comdat
   bool supportsCOMDAT() const { return !isOSBinFormatMachO(); }
 

llvm/lib/MC/MCSectionELF.cpp

@@ -113,8 +113,7 @@ void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
       OS << 'c';
     if (Flags & ELF::XCORE_SHF_DP_SECTION)
       OS << 'd';
-  } else if (Arch == Triple::arm || Arch == Triple::armeb ||
-             Arch == Triple::thumb || Arch == Triple::thumbeb) {
+  } else if (T.isARM() || T.isThumb()) {
     if (Flags & ELF::SHF_ARM_PURECODE)
       OS << 'y';
   }

llvm/lib/Object/ELFObjectFile.cpp

@@ -260,8 +260,7 @@ void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
 
   std::string Triple;
   // Default to ARM, but use the triple if it's been set.
-  if (TheTriple.getArch() == Triple::thumb ||
-      TheTriple.getArch() == Triple::thumbeb)
+  if (TheTriple.isThumb())
     Triple = "thumb";
   else
     Triple = "arm";

llvm/lib/Target/ARM/ARMAsmPrinter.cpp

@@ -476,11 +476,7 @@ void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
   // Use the triple's architecture and subarchitecture to determine
   // if we're thumb for the purposes of the top level code16 assembler
   // flag.
-  bool isThumb = TT.getArch() == Triple::thumb ||
-                 TT.getArch() == Triple::thumbeb ||
-                 TT.getSubArch() == Triple::ARMSubArch_v7m ||
-                 TT.getSubArch() == Triple::ARMSubArch_v6m;
-  if (!M.getModuleInlineAsm().empty() && isThumb)
+  if (!M.getModuleInlineAsm().empty() && TT.isThumb())
     OutStreamer->EmitAssemblerFlag(MCAF_Code16);
 }
 

llvm/lib/Target/ARM/ARMAsmPrinter.h

@@ -135,8 +135,7 @@ class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
     const Triple &TT = TM.getTargetTriple();
     if (!TT.isOSBinFormatMachO())
       return 0;
-    bool isThumb = TT.getArch() == Triple::thumb ||
-                   TT.getArch() == Triple::thumbeb ||
+    bool isThumb = TT.isThumb() ||
                    TT.getSubArch() == Triple::ARMSubArch_v7m ||
                    TT.getSubArch() == Triple::ARMSubArch_v6m;
     return isThumb ? ARM::DW_ISA_ARM_thumb : ARM::DW_ISA_ARM_arm;

llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp

@@ -131,16 +131,13 @@ static bool getARMLoadDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
 #include "ARMGenSubtargetInfo.inc"
 
 std::string ARM_MC::ParseARMTriple(const Triple &TT, StringRef CPU) {
-  bool isThumb =
-      TT.getArch() == Triple::thumb || TT.getArch() == Triple::thumbeb;
-
   std::string ARMArchFeature;
 
   ARM::ArchKind ArchID = ARM::parseArch(TT.getArchName());
   if (ArchID != ARM::ArchKind::INVALID &&  (CPU.empty() || CPU == "generic"))
     ARMArchFeature = (ARMArchFeature + "+" + ARM::getArchName(ArchID)).str();
 
-  if (isThumb) {
+  if (TT.isThumb()) {
     if (ARMArchFeature.empty())
       ARMArchFeature = "+thumb-mode";
     else