[ARMTargetParser] Move IAS arch ext parser. NFC

The plan was to move the whole table into the already existing ArchExtNames
but some fields depend on a table-generated file, and we don't yet have this
feature in the generic lib/Support side.

Once the minimum target-specific table-generated files are available in a
generic fashion to these libraries, we'll have to keep it in the ASM parser.

llvm-svn: 238651

Author: rengolin

llvm/include/llvm/Support/TargetParser.h

@@ -92,8 +92,15 @@ namespace ARM {
     AEK_FP,
     AEK_HWDIV,
     AEK_MP,
+    AEK_SIMD,
     AEK_SEC,
     AEK_VIRT,
+    // Unsupported extensions.
+    AEK_OS,
+    AEK_IWMMXT,
+    AEK_IWMMXT2,
+    AEK_MAVERICK,
+    AEK_XSCALE,
     AEK_LAST
   };
 

llvm/lib/Support/TargetParser.cpp

@@ -106,8 +106,14 @@ struct {
   { "fp",       ARM::AEK_FP },
   { "idiv",     ARM::AEK_HWDIV },
   { "mp",       ARM::AEK_MP },
+  { "simd",     ARM::AEK_SIMD },
   { "sec",      ARM::AEK_SEC },
-  { "virt",     ARM::AEK_VIRT }
+  { "virt",     ARM::AEK_VIRT },
+  { "os",       ARM::AEK_OS },
+  { "iwmmxt",   ARM::AEK_IWMMXT },
+  { "iwmmxt2",  ARM::AEK_IWMMXT2 },
+  { "maverick", ARM::AEK_MAVERICK },
+  { "xscale",   ARM::AEK_XSCALE }
 };
 // List of CPU names and their arches.
 // The same CPU can have multiple arches and can be default on multiple arches.

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

@@ -9982,33 +9982,32 @@ extern "C" void LLVMInitializeARMAsmParser() {
 #define GET_MATCHER_IMPLEMENTATION
 #include "ARMGenAsmMatcher.inc"
 
+// FIXME: This structure should be moved inside ARMTargetParser
+// 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 char *Name;
+  const ARM::ArchExtKind Kind;
   const unsigned ArchCheck;
   const FeatureBitset Features;
 } Extensions[] = {
-  { "crc", Feature_HasV8, {ARM::FeatureCRC} },
-  { "crypto",  Feature_HasV8,
+  { ARM::AEK_CRC, Feature_HasV8, {ARM::FeatureCRC} },
+  { ARM::AEK_CRYPTO,  Feature_HasV8,
     {ARM::FeatureCrypto, ARM::FeatureNEON, ARM::FeatureFPARMv8} },
-  { "fp", Feature_HasV8, {ARM::FeatureFPARMv8} },
-  { "idiv", Feature_HasV7 | Feature_IsNotMClass,
+  { ARM::AEK_FP, Feature_HasV8, {ARM::FeatureFPARMv8} },
+  { ARM::AEK_HWDIV, Feature_HasV7 | Feature_IsNotMClass,
     {ARM::FeatureHWDiv, ARM::FeatureHWDivARM} },
-  // FIXME: iWMMXT not supported
-  { "iwmmxt", Feature_None, {} },
-  // FIXME: iWMMXT2 not supported
-  { "iwmmxt2", Feature_None, {} },
-  // FIXME: Maverick not supported
-  { "maverick", Feature_None, {} },
-  { "mp", Feature_HasV7 | Feature_IsNotMClass, {ARM::FeatureMP} },
-  // FIXME: ARMv6-m OS Extensions feature not checked
-  { "os", Feature_None, {} },
+  { ARM::AEK_MP, Feature_HasV7 | Feature_IsNotMClass, {ARM::FeatureMP} },
+  { ARM::AEK_SIMD, Feature_HasV8, {ARM::FeatureNEON, ARM::FeatureFPARMv8} },
   // FIXME: Also available in ARMv6-K
-  { "sec", Feature_HasV7, {ARM::FeatureTrustZone} },
-  { "simd", Feature_HasV8, {ARM::FeatureNEON, ARM::FeatureFPARMv8} },
+  { ARM::AEK_SEC, Feature_HasV7, {ARM::FeatureTrustZone} },
   // FIXME: Only available in A-class, isel not predicated
-  { "virt", Feature_HasV7, {ARM::FeatureVirtualization} },
-  // FIXME: xscale not supported
-  { "xscale", Feature_None, {} },
+  { ARM::AEK_VIRT, Feature_HasV7, {ARM::FeatureVirtualization} },
+  // FIXME: Unsupported extensions.
+  { ARM::AEK_OS, Feature_None, {} },
+  { ARM::AEK_IWMMXT, Feature_None, {} },
+  { ARM::AEK_IWMMXT2, Feature_None, {} },
+  { ARM::AEK_MAVERICK, Feature_None, {} },
+  { ARM::AEK_XSCALE, Feature_None, {} },
 };
 
 /// parseDirectiveArchExtension
@@ -10031,9 +10030,12 @@ bool ARMAsmParser::parseDirectiveArchExtension(SMLoc L) {
     EnableFeature = false;
     Name = Name.substr(2);
   }
+  unsigned FeatureKind = ARMTargetParser::parseArchExt(Name);
+  if (FeatureKind == ARM::AEK_INVALID)
+    Error(ExtLoc, "unknown architectural extension: " + Name);
 
   for (const auto &Extension : Extensions) {
-    if (Extension.Name != Name)
+    if (Extension.Kind != FeatureKind)
       continue;
 
     if (Extension.Features.none())