[PATCH] Use ".arch_extension" ARM directive to specify the additional CPU features

[Sumanth Gundapaneni]

Hi rengolin, t.p.northover, apazos,

This patch is in response to r223147 where the avaiable features are  computed based on ".cpu" directive. This will work clean for the standard  variants like cortex-a9. For custom variants which rely on standard cpu names for aassembly, the additional features of a CPU should be propagated. This can be done via ".arch_extension" as long as the assembler supports it.

http://reviews.llvm.org/D7316

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp

Index: include/llvm/MC/MCStreamer.h
===================================================================
--- include/llvm/MC/MCStreamer.h
+++ include/llvm/MC/MCStreamer.h
@@ -139,6 +139,7 @@
                                     StringRef StringValue = "");
   virtual void emitFPU(unsigned FPU);
   virtual void emitArch(unsigned Arch);
+  virtual void emitArchExtension(StringRef StringValue);
   virtual void emitObjectArch(unsigned Arch);
   virtual void finishAttributeSection();
   virtual void emitInst(uint32_t Inst, char Suffix = '\0');
Index: lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -134,6 +134,7 @@
   void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
                             StringRef StrinValue) override;
   void emitArch(unsigned Arch) override;
+  void emitArchExtension(StringRef StringValue) override;
   void emitObjectArch(unsigned Arch) override;
   void emitFPU(unsigned FPU) override;
   void emitInst(uint32_t Inst, char Suffix = '\0') override;
@@ -249,6 +250,9 @@
 void ARMTargetAsmStreamer::emitArch(unsigned Arch) {
   OS << "\t.arch\t" << GetArchName(Arch) << "\n";
 }
+void ARMTargetAsmStreamer::emitArchExtension(StringRef StringValue) {
+  OS << "\t.arch_extension\t" << StringValue << "\n";
+}
 void ARMTargetAsmStreamer::emitObjectArch(unsigned Arch) {
   OS << "\t.object_arch\t" << GetArchName(Arch) << '\n';
 }
Index: lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp
@@ -63,6 +63,7 @@
                                              unsigned IntValue,
                                              StringRef StringValue) {}
 void ARMTargetStreamer::emitArch(unsigned Arch) {}
+void ARMTargetStreamer::emitArchExtension(StringRef StringValue) {}
 void ARMTargetStreamer::emitObjectArch(unsigned Arch) {}
 void ARMTargetStreamer::emitFPU(unsigned FPU) {}
 void ARMTargetStreamer::finishAttributeSection() {}

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