[mips] Add support to '.set mips64'.

The '.set mips64' directive enables the feature Mips:FeatureMips64
from assembly. Note that it doesn't modify the ELF header as opposed
to the use of -mips64 from the command-line. The reason for this
is that we want to be as compatible as possible with existing assemblers
like GAS.

llvm-svn: 204817

3 files changed, 17 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index 2244e3dec64..35c1f4bf4f5 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -2489,6 +2489,10 @@ bool MipsAsmParser::parseSetFeature(uint64_t Feature) {
       setFeatureBits(Mips::FeatureMips32r2, "mips32r2");
       getTargetStreamer().emitDirectiveSetMips32R2();
     break;
+    case Mips::FeatureMips64:
+      setFeatureBits(Mips::FeatureMips64, "mips64");
+      getTargetStreamer().emitDirectiveSetMips64();
+    break;
     case Mips::FeatureMips64r2:
       setFeatureBits(Mips::FeatureMips64r2, "mips64r2");
       getTargetStreamer().emitDirectiveSetMips64R2();
@@ -2526,6 +2530,8 @@ bool MipsAsmParser::parseDirectiveSet() {
       return parseSetFeature(Mips::FeatureMicroMips);
   } else if (Tok.getString() == "mips32r2") {
       return parseSetFeature(Mips::FeatureMips32r2);
+  } else if (Tok.getString() == "mips64") {
+      return parseSetFeature(Mips::FeatureMips64);
   } else if (Tok.getString() == "mips64r2") {
       return parseSetFeature(Mips::FeatureMips64r2);
   } else if (Tok.getString() == "dsp") {
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
index f21dbed3c8a..01730dd773c 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
@@ -105,6 +105,10 @@ void MipsTargetAsmStreamer::emitDirectiveSetMips32R2() {
   OS << "\t.set\tmips32r2\n";
 }
 
+void MipsTargetAsmStreamer::emitDirectiveSetMips64() {
+  OS << "\t.set\tmips64\n";
+}
+
 void MipsTargetAsmStreamer::emitDirectiveSetMips64R2() {
   OS << "\t.set\tmips64r2\n";
 }
@@ -359,6 +363,10 @@ void MipsTargetELFStreamer::emitDirectiveSetMips32R2() {
   // No action required for ELF output.
 }
 
+void MipsTargetELFStreamer::emitDirectiveSetMips64() {
+  // No action required for ELF output.
+}
+
 void MipsTargetELFStreamer::emitDirectiveSetMips64R2() {
   // No action required for ELF output.
 }
diff --git a/llvm/lib/Target/Mips/MipsTargetStreamer.h b/llvm/lib/Target/Mips/MipsTargetStreamer.h
index e8349a6e3e7..5f4b74b3ba0 100644
--- a/llvm/lib/Target/Mips/MipsTargetStreamer.h
+++ b/llvm/lib/Target/Mips/MipsTargetStreamer.h
@@ -42,6 +42,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff) = 0;
 
   virtual void emitDirectiveSetMips32R2() = 0;
+  virtual void emitDirectiveSetMips64() = 0;
   virtual void emitDirectiveSetMips64R2() = 0;
   virtual void emitDirectiveSetDsp() = 0;
 };
@@ -75,6 +76,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff);
 
   virtual void emitDirectiveSetMips32R2();
+  virtual void emitDirectiveSetMips64();
   virtual void emitDirectiveSetMips64R2();
   virtual void emitDirectiveSetDsp();
 };
@@ -117,6 +119,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff);
 
   virtual void emitDirectiveSetMips32R2();
+  virtual void emitDirectiveSetMips64();
   virtual void emitDirectiveSetMips64R2();
   virtual void emitDirectiveSetDsp();
 };