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

These directives are used to set the default value of the SoftFloat feature.
They have the same effect as setting -m{soft, hard}-float from the command line.

Differential Revision: http://reviews.llvm.org/D9073

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241066 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -4703,6 +4703,8 @@ bool MipsAsmParser::parseInsnDirective() {
 ///  ::= .module oddspreg
 ///  ::= .module nooddspreg
 ///  ::= .module fp=value
+///  ::= .module softfloat
+///  ::= .module hardfloat
 bool MipsAsmParser::parseDirectiveModule() {
   MCAsmParser &Parser = getParser();
   MCAsmLexer &Lexer = getLexer();
@@ -4765,6 +4767,44 @@ bool MipsAsmParser::parseDirectiveModule() {
     return false; // parseDirectiveModule has finished successfully.
   } else if (Option == "fp") {
     return parseDirectiveModuleFP();
+  } else if (Option == "softfloat") {
+    setModuleFeatureBits(Mips::FeatureSoftFloat, "soft-float");
+
+    // Synchronize the ABI Flags information with the FeatureBits information we
+    // updated above.
+    getTargetStreamer().updateABIInfo(*this);
+
+    // If printing assembly, use the recently updated ABI Flags information.
+    // If generating ELF, don't do anything (the .MIPS.abiflags section gets
+    // emitted later).
+    getTargetStreamer().emitDirectiveModuleSoftFloat();
+
+    // If this is not the end of the statement, report an error.
+    if (getLexer().isNot(AsmToken::EndOfStatement)) {
+      reportParseError("unexpected token, expected end of statement");
+      return false;
+    }
+
+    return false; // parseDirectiveModule has finished successfully.
+  } else if (Option == "hardfloat") {
+    clearModuleFeatureBits(Mips::FeatureSoftFloat, "soft-float");
+
+    // Synchronize the ABI Flags information with the FeatureBits information we
+    // updated above.
+    getTargetStreamer().updateABIInfo(*this);
+
+    // If printing assembly, use the recently updated ABI Flags information.
+    // If generating ELF, don't do anything (the .MIPS.abiflags section gets
+    // emitted later).
+    getTargetStreamer().emitDirectiveModuleHardFloat();
+
+    // If this is not the end of the statement, report an error.
+    if (getLexer().isNot(AsmToken::EndOfStatement)) {
+      reportParseError("unexpected token, expected end of statement");
+      return false;
+    }
+
+    return false; // parseDirectiveModule has finished successfully.
   } else {
     return Error(L, "'" + Twine(Option) + "' is not a valid .module option.");
   }

lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp

@@ -99,6 +99,8 @@ void MipsTargetStreamer::emitDirectiveModuleOddSPReg() {
   if (!ABIFlagsSection.OddSPReg && !ABIFlagsSection.Is32BitABI)
     report_fatal_error("+nooddspreg is only valid for O32");
 }
+void MipsTargetStreamer::emitDirectiveModuleSoftFloat() {}
+void MipsTargetStreamer::emitDirectiveModuleHardFloat() {}
 void MipsTargetStreamer::emitDirectiveSetFp(
     MipsABIFlagsSection::FpABIKind Value) {
   forbidModuleDirective();
@@ -404,6 +406,14 @@ void MipsTargetAsmStreamer::emitDirectiveSetNoOddSPReg() {
   OS << "\t.set\tnooddspreg\n";
 }
 
+void MipsTargetAsmStreamer::emitDirectiveModuleSoftFloat() {
+  OS << "\t.module\tsoftfloat\n";
+}
+
+void MipsTargetAsmStreamer::emitDirectiveModuleHardFloat() {
+  OS << "\t.module\thardfloat\n";
+}
+
 // This part is for ELF object output.
 MipsTargetELFStreamer::MipsTargetELFStreamer(MCStreamer &S,
                                              const MCSubtargetInfo &STI)

lib/Target/Mips/MipsTargetStreamer.h

@@ -83,6 +83,8 @@ public:
   // FP abiflags directives
   virtual void emitDirectiveModuleFP();
   virtual void emitDirectiveModuleOddSPReg();
+  virtual void emitDirectiveModuleSoftFloat();
+  virtual void emitDirectiveModuleHardFloat();
   virtual void emitDirectiveSetFp(MipsABIFlagsSection::FpABIKind Value);
   virtual void emitDirectiveSetOddSPReg();
   virtual void emitDirectiveSetNoOddSPReg();
@@ -192,6 +194,8 @@ public:
   // FP abiflags directives
   void emitDirectiveModuleFP() override;
   void emitDirectiveModuleOddSPReg() override;
+  void emitDirectiveModuleSoftFloat() override;
+  void emitDirectiveModuleHardFloat() override;
   void emitDirectiveSetFp(MipsABIFlagsSection::FpABIKind Value) override;
   void emitDirectiveSetOddSPReg() override;
   void emitDirectiveSetNoOddSPReg() override;

test/MC/Mips/module-hardfloat.s

@@ -0,0 +1,26 @@
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 | \
+# RUN:   FileCheck %s -check-prefix=CHECK-ASM
+#
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 -filetype=obj -o - | \
+# RUN:   llvm-readobj -mips-abi-flags - | \
+# RUN:     FileCheck %s -check-prefix=CHECK-OBJ
+
+# CHECK-ASM: .module hardfloat
+
+# Check if the MIPS.abiflags section was correctly emitted:
+# CHECK-OBJ: MIPS ABI Flags {
+# CHECK-OBJ:   FP ABI: Hard float (32-bit CPU, Any FPU) (0x5)
+# CHECK-OBJ:   CPR1 size: 32
+# CHECK-OBJ:   Flags 1 [ (0x1)
+# CHECK-OBJ:     ODDSPREG (0x1)
+# CHECK-OBJ:   ]
+# CHECK-OBJ: }
+
+  .module fp=xx
+  .module oddspreg
+  .module softfloat
+  .module hardfloat
+
+# FIXME: Test should include gnu_attributes directive when implemented.
+#        An explicit .gnu_attribute must be checked against the effective
+#        command line options and any inconsistencies reported via a warning.

test/MC/Mips/module-softfloat.s

@@ -0,0 +1,20 @@
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 | \
+# RUN:   FileCheck %s -check-prefix=CHECK-ASM
+#
+# RUN: llvm-mc %s -arch=mips -mcpu=mips32 -filetype=obj -o - | \
+# RUN:   llvm-readobj -mips-abi-flags - | \
+# RUN:     FileCheck %s -check-prefix=CHECK-OBJ
+
+# CHECK-ASM: .module softfloat
+
+# Check if the MIPS.abiflags section was correctly emitted:
+# CHECK-OBJ: MIPS ABI Flags {
+# CHECK-OBJ:   FP ABI: Soft float (0x3)
+# CHECK-OBJ:   CPR1 size: 0
+# CHECK-OBJ: }
+
+  .module softfloat
+
+# FIXME: Test should include gnu_attributes directive when implemented.
+#        An explicit .gnu_attribute must be checked against the effective
+#        command line options and any inconsistencies reported via a warning.