commit 3408caf68662ff8df209e52ab3aa4e27c14a371d
author Petar Jovanovic <petar.jovanovic@mips.com> Wed Mar 14 14:13:31 2018 +0000
committer Petar Jovanovic <petar.jovanovic@mips.com> Wed Mar 14 14:13:31 2018 +0000
tree 0fdff253a660258d80f592b83bbcb99343ffc49f
parent d5949429280b625d8d77becdb47fbd75bc8a4e0f

[mips] Add support for CRC ASE

This includes

  Instructions: crc32b, crc32h, crc32w, crc32d,
                crc32cb, crc32ch, crc32cw, crc32cd

  Assembler directives: .set crc, .set nocrc, .module crc, .module nocrc

  Attribute: crc

  .MIPS.abiflags: CRC (0x8000)

Patch by Vladimir Stefanovic.

Differential Revision: https://reviews.llvm.org/D44176

llvm-svn: 327511

llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp

diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index 085d576..f7467e9 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -348,6 +348,7 @@
   bool parseSetHardFloatDirective();
   bool parseSetMtDirective();
   bool parseSetNoMtDirective();
+  bool parseSetNoCRCDirective();
 
   bool parseSetAssignment();
 
@@ -644,6 +645,10 @@
     return getSTI().getFeatureBits()[Mips::FeatureMT];
   }
 
+  bool hasCRC() const {
+    return getSTI().getFeatureBits()[Mips::FeatureCRC];
+  }
+
   /// Warn if RegIndex is the same as the current AT.
   void warnIfRegIndexIsAT(unsigned RegIndex, SMLoc Loc);
 
@@ -5246,6 +5251,13 @@
       return Match_RequiresPosSizeRange33_64;
     return Match_Success;
   }
+  case Mips::CRC32B: case Mips::CRC32CB:
+  case Mips::CRC32H: case Mips::CRC32CH:
+  case Mips::CRC32W: case Mips::CRC32CW:
+  case Mips::CRC32D: case Mips::CRC32CD:
+    if (Inst.getOperand(0).getReg() != Inst.getOperand(2).getReg())
+      return Match_RequiresSameSrcAndDst;
+    return Match_Success;
   }
 
   uint64_t TSFlags = getInstDesc(Inst.getOpcode()).TSFlags;
@@ -6665,6 +6677,23 @@
   return false;
 }
 
+bool MipsAsmParser::parseSetNoCRCDirective() {
+  MCAsmParser &Parser = getParser();
+  Parser.Lex(); // Eat "nocrc".
+
+  // 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;
+  }
+
+  clearFeatureBits(Mips::FeatureCRC, "crc");
+
+  getTargetStreamer().emitDirectiveSetNoCRC();
+  Parser.Lex(); // Consume the EndOfStatement.
+  return false;
+}
+
 bool MipsAsmParser::parseSetPopDirective() {
   MCAsmParser &Parser = getParser();
   SMLoc Loc = getLexer().getLoc();
@@ -6886,6 +6915,10 @@
     selectArch("mips64r6");
     getTargetStreamer().emitDirectiveSetMips64R6();
     break;
+  case Mips::FeatureCRC:
+    setFeatureBits(Mips::FeatureCRC, "crc");
+    getTargetStreamer().emitDirectiveSetCRC();
+    break;
   }
   return false;
 }
@@ -7190,6 +7223,10 @@
     return parseSetSoftFloatDirective();
   } else if (Tok.getString() == "hardfloat") {
     return parseSetHardFloatDirective();
+  } else if (Tok.getString() == "crc") {
+    return parseSetFeature(Mips::FeatureCRC);
+  } else if (Tok.getString() == "nocrc") {
+    return parseSetNoCRCDirective();
   } else {
     // It is just an identifier, look for an assignment.
     parseSetAssignment();
@@ -7436,6 +7473,8 @@
 ///  ::= .module softfloat
 ///  ::= .module hardfloat
 ///  ::= .module mt
+///  ::= .module crc
+///  ::= .module nocrc
 bool MipsAsmParser::parseDirectiveModule() {
   MCAsmParser &Parser = getParser();
   MCAsmLexer &Lexer = getLexer();
@@ -7554,6 +7593,44 @@
     }
 
     return false; // parseDirectiveModule has finished successfully.
+  } else if (Option == "crc") {
+    setModuleFeatureBits(Mips::FeatureCRC, "crc");
+
+    // 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().emitDirectiveModuleCRC();
+
+    // 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 == "nocrc") {
+    clearModuleFeatureBits(Mips::FeatureCRC, "crc");
+
+    // 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().emitDirectiveModuleNoCRC();
+
+    // 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.");
   }