[mips] [IAS] Add support for the .set softfloat/hardfloat directives.

Summary: These directives are used to set the current value of the SoftFloat feature.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits, mpf

Differential Revision: http://reviews.llvm.org/D9074

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238813 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -247,6 +247,8 @@ class MipsAsmParser : public MCTargetAsmParser {
   bool parseSetFpDirective();
   bool parseSetPopDirective();
   bool parseSetPushDirective();
+  bool parseSetSoftFloatDirective();
+  bool parseSetHardFloatDirective();
 
   bool parseSetAssignment();
 
@@ -3621,6 +3623,28 @@ bool MipsAsmParser::parseSetPushDirective() {
   return false;
 }
 
+bool MipsAsmParser::parseSetSoftFloatDirective() {
+  MCAsmParser &Parser = getParser();
+  Parser.Lex();
+  if (getLexer().isNot(AsmToken::EndOfStatement))
+    return reportParseError("unexpected token, expected end of statement");
+
+  setFeatureBits(Mips::FeatureSoftFloat, "soft-float");
+  getTargetStreamer().emitDirectiveSetSoftFloat();
+  return false;
+}
+
+bool MipsAsmParser::parseSetHardFloatDirective() {
+  MCAsmParser &Parser = getParser();
+  Parser.Lex();
+  if (getLexer().isNot(AsmToken::EndOfStatement))
+    return reportParseError("unexpected token, expected end of statement");
+
+  clearFeatureBits(Mips::FeatureSoftFloat, "soft-float");
+  getTargetStreamer().emitDirectiveSetHardFloat();
+  return false;
+}
+
 bool MipsAsmParser::parseSetAssignment() {
   StringRef Name;
   const MCExpr *Value;
@@ -3985,6 +4009,10 @@ bool MipsAsmParser::parseDirectiveSet() {
     return parseSetMsaDirective();
   } else if (Tok.getString() == "nomsa") {
     return parseSetNoMsaDirective();
+  } else if (Tok.getString() == "softfloat") {
+    return parseSetSoftFloatDirective();
+  } else if (Tok.getString() == "hardfloat") {
+    return parseSetHardFloatDirective();
   } else {
     // It is just an identifier, look for an assignment.
     parseSetAssignment();

lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp

@@ -81,6 +81,12 @@ void MipsTargetStreamer::emitDirectiveSetMips64R5() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitDirectiveSetMips64R6() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitDirectiveSetPop() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitDirectiveSetPush() { forbidModuleDirective(); }
+void MipsTargetStreamer::emitDirectiveSetSoftFloat() {
+  forbidModuleDirective();
+}
+void MipsTargetStreamer::emitDirectiveSetHardFloat() {
+  forbidModuleDirective();
+}
 void MipsTargetStreamer::emitDirectiveSetDsp() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitDirectiveSetNoDsp() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitDirectiveCpLoad(unsigned RegNo) {}
@@ -308,6 +314,16 @@ void MipsTargetAsmStreamer::emitDirectiveSetPush() {
  MipsTargetStreamer::emitDirectiveSetPush();
 }
 
+void MipsTargetAsmStreamer::emitDirectiveSetSoftFloat() {
+  OS << "\t.set\tsoftfloat\n";
+  MipsTargetStreamer::emitDirectiveSetSoftFloat();
+}
+
+void MipsTargetAsmStreamer::emitDirectiveSetHardFloat() {
+  OS << "\t.set\thardfloat\n";
+  MipsTargetStreamer::emitDirectiveSetHardFloat();
+}
+
 // Print a 32 bit hex number with all numbers.
 static void printHex32(unsigned Value, raw_ostream &OS) {
   OS << "0x";

lib/Target/Mips/MipsTargetStreamer.h

@@ -72,6 +72,8 @@ public:
   virtual void emitDirectiveSetNoDsp();
   virtual void emitDirectiveSetPop();
   virtual void emitDirectiveSetPush();
+  virtual void emitDirectiveSetSoftFloat();
+  virtual void emitDirectiveSetHardFloat();
 
   // PIC support
   virtual void emitDirectiveCpLoad(unsigned RegNo);
@@ -188,6 +190,8 @@ public:
   void emitDirectiveSetNoDsp() override;
   void emitDirectiveSetPop() override;
   void emitDirectiveSetPush() override;
+  void emitDirectiveSetSoftFloat() override;
+  void emitDirectiveSetHardFloat() override;
 
   // PIC support
   void emitDirectiveCpLoad(unsigned RegNo) override;

test/MC/Mips/set-softfloat-hardfloat-bad.s

@@ -0,0 +1,14 @@
+# RUN: not llvm-mc %s -triple=mips-unknown-linux -mcpu=mips32 -mattr=+soft-float 2>%t1
+# RUN: FileCheck %s < %t1
+
+  .set hardfloat
+  add.s $f2, $f2, $f2
+  # CHECK-NOT: :[[@LINE-1]]:3: error: instruction requires a CPU feature not currently enabled
+  sub.s $f2, $f2, $f2
+  # CHECK-NOT: :[[@LINE-1]]:3: error: instruction requires a CPU feature not currently enabled
+
+  .set softfloat
+  add.s $f2, $f2, $f2
+  # CHECK: :[[@LINE-1]]:3: error: instruction requires a CPU feature not currently enabled
+  sub.s $f2, $f2, $f2
+  # CHECK: :[[@LINE-1]]:3: error: instruction requires a CPU feature not currently enabled

test/MC/Mips/set-softfloat-hardfloat.s

@@ -0,0 +1,12 @@
+# RUN: llvm-mc %s -triple=mips-unknown-linux -mcpu=mips32r2 -mattr=+soft-float | \
+# RUN:   FileCheck %s
+
+  .set hardfloat
+  add.s $f2, $f2, $f2
+  sub.s $f2, $f2, $f2
+  .set softfloat
+
+# CHECK: .set hardfloat
+# CHECK: add.s $f2, $f2, $f2
+# CHECK: sub.s $f2, $f2, $f2
+# CHECK: .set softfloat