This patch implements .set dsp directive and sets appropriate feature bits.This directive is a counterpart of -mattr=dsp command line option with the exception that it does not influence elf header flags. The usage example is gives in test file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202966 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -2460,6 +2460,13 @@ bool MipsAsmParser::parseDirectiveSet() {
     setFeatureBits(Mips::FeatureMips32r2,"mips32r2");
     getTargetStreamer().emitDirectiveSetMips32R2();
     return false;
+  } else if (Tok.getString() == "dsp") {
+    Parser.Lex(); // Eat token.
+    if (getLexer().isNot(AsmToken::EndOfStatement))
+      return reportParseError("unexpected token in .set directive");
+    setFeatureBits(Mips::FeatureDSP, "dsp");
+    getTargetStreamer().emitDirectiveSetDsp();
+    return false;
   } else {
     // It is just an identifier, look for an assignment.
     parseSetAssignment();

lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp

@@ -101,6 +101,9 @@ void MipsTargetAsmStreamer::emitDirectiveSetMips32R2() {
   OS << "\t.set\tmips32r2\n";
 }
 
+void MipsTargetAsmStreamer::emitDirectiveSetDsp() {
+  OS << "\t.set\tdsp\n";
+}
 // Print a 32 bit hex number with all numbers.
 static void printHex32(unsigned Value, raw_ostream &OS) {
   OS << "0x";
@@ -310,3 +313,7 @@ void MipsTargetELFStreamer::emitFMask(unsigned FPUBitmask,
 void MipsTargetELFStreamer::emitDirectiveSetMips32R2() {
   // No action required for ELF output.
 }
+
+void MipsTargetELFStreamer::emitDirectiveSetDsp() {
+  // No action required for ELF output.
+}

lib/Target/Mips/MipsTargetStreamer.h

@@ -41,6 +41,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff) = 0;
 
   virtual void emitDirectiveSetMips32R2() = 0;
+  virtual void emitDirectiveSetDsp() = 0;
 };
 
 // This part is for ascii assembly output
@@ -71,6 +72,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff);
 
   virtual void emitDirectiveSetMips32R2();
+  virtual void emitDirectiveSetDsp();
 };
 
 // This part is for ELF object output
@@ -108,6 +110,7 @@ public:
   virtual void emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff);
 
   virtual void emitDirectiveSetMips32R2();
+  virtual void emitDirectiveSetDsp();
 };
 }
 #endif

test/MC/Mips/mips_directives.s

@@ -58,3 +58,10 @@ $BB0_4:
     ldxc1   $f0, $zero($5)
     luxc1   $f0, $6($5)
     lwxc1   $f6, $2($5)
+
+# CHECK:   .set dsp
+# CHECK:   lbux    $7, $10($11)         # encoding: [0x7d,0x6a,0x39,0x8a]
+# CHECK:   lhx     $5, $6($7)           # encoding: [0x7c,0xe6,0x29,0x0a]
+   .set dsp
+   lbux    $7, $10($11)
+   lhx     $5, $6($7)