1 files changed, 63 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Support/RISCVISAInfo.cpp b/contrib/llvm-project/llvm/lib/Support/RISCVISAInfo.cpp
index 1b1bff023d2f..7cb1147d4265 100644
--- a/contrib/llvm-project/llvm/lib/Support/RISCVISAInfo.cpp
+++ b/contrib/llvm-project/llvm/lib/Support/RISCVISAInfo.cpp
@@ -503,6 +503,67 @@ RISCVISAInfo::parseFeatures(unsigned XLen,
 }
 
 llvm::Expected<std::unique_ptr<RISCVISAInfo>>
+RISCVISAInfo::parseNormalizedArchString(StringRef Arch) {
+  if (llvm::any_of(Arch, isupper)) {
+    return createStringError(errc::invalid_argument,
+                             "string must be lowercase");
+  }
+  // Must start with a valid base ISA name.
+  unsigned XLen;
+  if (Arch.startswith("rv32i") || Arch.startswith("rv32e"))
+    XLen = 32;
+  else if (Arch.startswith("rv64i") || Arch.startswith("rv64e"))
+    XLen = 64;
+  else
+    return createStringError(errc::invalid_argument,
+                             "arch string must begin with valid base ISA");
+  std::unique_ptr<RISCVISAInfo> ISAInfo(new RISCVISAInfo(XLen));
+  // Discard rv32/rv64 prefix.
+  Arch = Arch.substr(4);
+
+  // Each extension is of the form ${name}${major_version}p${minor_version}
+  // and separated by _. Split by _ and then extract the name and version
+  // information for each extension.
+  SmallVector<StringRef, 8> Split;
+  Arch.split(Split, '_');
+  for (StringRef Ext : Split) {
+    StringRef Prefix, MinorVersionStr;
+    std::tie(Prefix, MinorVersionStr) = Ext.rsplit('p');
+    if (MinorVersionStr.empty())
+      return createStringError(errc::invalid_argument,
+                               "extension lacks version in expected format");
+    unsigned MajorVersion, MinorVersion;
+    if (MinorVersionStr.getAsInteger(10, MinorVersion))
+      return createStringError(errc::invalid_argument,
+                               "failed to parse minor version number");
+
+    // Split Prefix into the extension name and the major version number
+    // (the trailing digits of Prefix).
+    int TrailingDigits = 0;
+    StringRef ExtName = Prefix;
+    while (!ExtName.empty()) {
+      if (!isDigit(ExtName.back()))
+        break;
+      ExtName = ExtName.drop_back(1);
+      TrailingDigits++;
+    }
+    if (!TrailingDigits)
+      return createStringError(errc::invalid_argument,
+                               "extension lacks version in expected format");
+
+    StringRef MajorVersionStr = Prefix.take_back(TrailingDigits);
+    if (MajorVersionStr.getAsInteger(10, MajorVersion))
+      return createStringError(errc::invalid_argument,
+                               "failed to parse major version number");
+    ISAInfo->addExtension(ExtName, MajorVersion, MinorVersion);
+  }
+  ISAInfo->updateFLen();
+  ISAInfo->updateMinVLen();
+  ISAInfo->updateMaxELen();
+  return std::move(ISAInfo);
+}
+
+llvm::Expected<std::unique_ptr<RISCVISAInfo>>
 RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
                               bool ExperimentalExtensionVersionCheck,
                               bool IgnoreUnknown) {
@@ -999,6 +1060,8 @@ std::vector<std::string> RISCVISAInfo::toFeatureVector() const {
     std::string ExtName = Ext.first;
     if (ExtName == "i") // i is not recognized in clang -cc1
       continue;
+    if (!isSupportedExtension(ExtName))
+      continue;
     std::string Feature = isExperimentalExtension(ExtName)
                               ? "+experimental-" + ExtName
                               : "+" + ExtName;