- Added support for parsing HWDiv features using Target Parser.

- Architecture extensions are represented as a bitmap.

Phabricator: http://reviews.llvm.org/D11457
llvm-svn: 243335

llvm/include/llvm/Support/TargetParser.h

@@ -122,22 +122,23 @@ namespace ARM {
 
   // Arch extension modifiers for CPUs.
   enum ArchExtKind {
-    AEK_INVALID = 0,
-    AEK_CRC,
-    AEK_CRYPTO,
-    AEK_FP,
-    AEK_HWDIV,
-    AEK_MP,
-    AEK_SIMD,
-    AEK_SEC,
-    AEK_VIRT,
+    AEK_INVALID  = 0x0,
+    AEK_NONE     = 0x1,
+    AEK_CRC      = 0x2,
+    AEK_CRYPTO   = 0x4,
+    AEK_FP       = 0x8,
+    AEK_HWDIV    = 0x10,
+    AEK_HWDIVARM = 0x20,
+    AEK_MP       = 0x40,
+    AEK_SIMD     = 0x80,
+    AEK_SEC      = 0x100,
+    AEK_VIRT     = 0x200,
     // Unsupported extensions.
-    AEK_OS,
-    AEK_IWMMXT,
-    AEK_IWMMXT2,
-    AEK_MAVERICK,
-    AEK_XSCALE,
-    AEK_LAST
+    AEK_OS       = 0x8000000,
+    AEK_IWMMXT   = 0x10000000,
+    AEK_IWMMXT2  = 0x20000000,
+    AEK_MAVERICK = 0x40000000,
+    AEK_XSCALE   = 0x80000000,
   };
 
   // ISA kinds.
@@ -167,6 +168,7 @@ namespace ARM {
 
 // Target Parsers, one per architecture.
 class ARMTargetParser {
+  static StringRef getHWDivSynonym(StringRef HWDiv);
   static StringRef getFPUSynonym(StringRef FPU);
   static StringRef getArchSynonym(StringRef Arch);
 
@@ -182,14 +184,18 @@ public:
   // FIXME: This should be moved to TargetTuple once it exists
   static       bool   getFPUFeatures(unsigned FPUKind,
                                      std::vector<const char*> &Features);
+  static       bool   getHWDivFeatures(unsigned HWDivKind,
+                                       std::vector<const char*> &Features);
   static const char * getArchName(unsigned ArchKind);
   static   unsigned   getArchAttr(unsigned ArchKind);
   static const char * getCPUAttr(unsigned ArchKind);
   static const char * getSubArch(unsigned ArchKind);
   static const char * getArchExtName(unsigned ArchExtKind);
+  static const char * getHWDivName(unsigned HWDivKind);
   static const char * getDefaultCPU(StringRef Arch);
 
   // Parser
+  static unsigned parseHWDiv(StringRef HWDiv);
   static unsigned parseFPU(StringRef FPU);
   static unsigned parseArch(StringRef Arch);
   static unsigned parseArchExt(StringRef ArchExt);

llvm/lib/Support/TargetParser.cpp

@@ -113,13 +113,14 @@ struct {
 // FIXME: TableGen this.
 struct {
   const char *Name;
-  ARM::ArchExtKind ID;
+  unsigned ID;
 } ARCHExtNames[] = {
   { "invalid",   ARM::AEK_INVALID },
+  { "none",      ARM::AEK_NONE },
   { "crc",       ARM::AEK_CRC },
   { "crypto",    ARM::AEK_CRYPTO },
   { "fp",        ARM::AEK_FP },
-  { "idiv",     ARM::AEK_HWDIV },
+  { "idiv",     (ARM::AEK_HWDIVARM | ARM::AEK_HWDIV) },
   { "mp",        ARM::AEK_MP },
   { "simd",      ARM::AEK_SIMD },
   { "sec",       ARM::AEK_SEC },
@@ -130,6 +131,19 @@ struct {
   { "maverick",  ARM::AEK_MAVERICK },
   { "xscale",    ARM::AEK_XSCALE }
 };
+// List of HWDiv names (use getHWDivSynonym) and which architectural
+// features they correspond to (use getHWDivFeatures).
+// FIXME: TableGen this.
+struct {
+  const char *Name;
+  unsigned ID;
+} HWDivNames[] = {
+  { "invalid",    ARM::AEK_INVALID },
+  { "none",       ARM::AEK_NONE },
+  { "thumb",      ARM::AEK_HWDIV },
+  { "arm",        ARM::AEK_HWDIVARM },
+  { "arm,thumb", (ARM::AEK_HWDIVARM | ARM::AEK_HWDIV) }
+};
 // List of CPU names and their arches.
 // The same CPU can have multiple arches and can be default on multiple arches.
 // When finding the Arch for a CPU, first-found prevails. Sort them accordingly.
@@ -266,6 +280,25 @@ unsigned ARMTargetParser::getDefaultFPU(StringRef CPU) {
   return ARM::FK_INVALID;
 }
 
+bool ARMTargetParser::getHWDivFeatures(unsigned HWDivKind,
+                                       std::vector<const char *> &Features) {
+
+  if (HWDivKind == ARM::AEK_INVALID)
+    return false;
+
+   if (HWDivKind & ARM::AEK_HWDIVARM)
+    Features.push_back("+hwdiv-arm");
+  else
+    Features.push_back("-hwdiv-arm");
+
+  if (HWDivKind & ARM::AEK_HWDIV)
+    Features.push_back("+hwdiv");
+  else
+    Features.push_back("-hwdiv");
+
+  return true;
+}
+
 bool ARMTargetParser::getFPUFeatures(unsigned FPUKind,
                                      std::vector<const char *> &Features) {
 
@@ -372,9 +405,19 @@ unsigned ARMTargetParser::getArchAttr(unsigned ArchKind) {
 }
 
 const char *ARMTargetParser::getArchExtName(unsigned ArchExtKind) {
-  if (ArchExtKind >= ARM::AEK_LAST)
+  for (const auto AE : ARCHExtNames) {
+    if (ArchExtKind == AE.ID)
+      return AE.Name;
+  }
+  return nullptr;
+}
+
+const char *ARMTargetParser::getHWDivName(unsigned HWDivKind) {
+  for (const auto D : HWDivNames) {
+    if (HWDivKind == D.ID)
+      return D.Name;
+  }
   return nullptr;
-  return ARCHExtNames[ArchExtKind].Name;
 }
 
 const char *ARMTargetParser::getDefaultCPU(StringRef Arch) {
@@ -394,6 +437,12 @@ const char *ARMTargetParser::getDefaultCPU(StringRef Arch) {
 // Parsers
 // ======================================================= //
 
+StringRef ARMTargetParser::getHWDivSynonym(StringRef HWDiv) {
+  return StringSwitch<StringRef>(HWDiv)
+    .Case("thumb,arm", "arm,thumb")
+    .Default(HWDiv);
+}
+
 StringRef ARMTargetParser::getFPUSynonym(StringRef FPU) {
   return StringSwitch<StringRef>(FPU)
     .Cases("fpa", "fpe2", "fpe3", "maverick", "invalid") // Unsupported
@@ -477,6 +526,15 @@ StringRef ARMTargetParser::getCanonicalArchName(StringRef Arch) {
   return A;
 }
 
+unsigned ARMTargetParser::parseHWDiv(StringRef HWDiv) {
+  StringRef Syn = getHWDivSynonym(HWDiv);
+  for (const auto D : HWDivNames) {
+    if (Syn == D.Name)
+      return D.ID;
+  }
+  return ARM::AEK_INVALID;
+}
+
 unsigned ARMTargetParser::parseFPU(StringRef FPU) {
   StringRef Syn = getFPUSynonym(FPU);
   for (const auto F : FPUNames) {

llvm/lib/Target/ARM/ARMAsmPrinter.cpp

@@ -578,7 +578,7 @@ void ARMAsmPrinter::emitAttributes() {
       // We consider krait as a "cortex-a9" + hwdiv CPU
       // Enable hwdiv through ".arch_extension idiv"
       if (STI.hasDivide() || STI.hasDivideInARMMode())
-        ATS.emitArchExtension(ARM::AEK_HWDIV);
+        ATS.emitArchExtension(ARM::AEK_HWDIV | ARM::AEK_HWDIVARM);
     } else
       ATS.emitTextAttribute(ARMBuildAttrs::CPU_name, CPUString);
   }

llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp

@@ -9971,7 +9971,7 @@ extern "C" void LLVMInitializeARMAsmParser() {
 // when we start to table-generate them, and we can use the ARM
 // flags below, that were generated by table-gen.
 static const struct {
-  const ARM::ArchExtKind Kind;
+  const unsigned Kind;
   const unsigned ArchCheck;
   const FeatureBitset Features;
 } Extensions[] = {
@@ -9979,7 +9979,7 @@ static const struct {
   { ARM::AEK_CRYPTO,  Feature_HasV8,
     {ARM::FeatureCrypto, ARM::FeatureNEON, ARM::FeatureFPARMv8} },
   { ARM::AEK_FP, Feature_HasV8, {ARM::FeatureFPARMv8} },
-  { ARM::AEK_HWDIV, Feature_HasV7 | Feature_IsNotMClass,
+  { (ARM::AEK_HWDIV | ARM::AEK_HWDIVARM), Feature_HasV7 | Feature_IsNotMClass,
     {ARM::FeatureHWDiv, ARM::FeatureHWDivARM} },
   { ARM::AEK_MP, Feature_HasV7 | Feature_IsNotMClass, {ARM::FeatureMP} },
   { ARM::AEK_SIMD, Feature_HasV8, {ARM::FeatureNEON, ARM::FeatureFPARMv8} },