[PATCH] D115668: [RISCV] Add a table for extension implications.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: kito-cheng, asb, jrtc27, eopXD, HsiangKai, frasercrmck.
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This a proof of concept for a suggestion I proposed in D108694 <https://reviews.llvm.org/D108694>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115668

Files:
  llvm/lib/Support/RISCVISAInfo.cpp


Index: llvm/lib/Support/RISCVISAInfo.cpp
===================================================================
--- llvm/lib/Support/RISCVISAInfo.cpp
+++ llvm/lib/Support/RISCVISAInfo.cpp
@@ -695,11 +695,22 @@
   return Error::success();
 }
 
+static const char *ImpliedExts_v[] = {"zvlsseg"};
+static const char *ImpliedExts_zfh[] = {"zfhmin"};
+
+struct ImpliedExtsEntry {
+  StringLiteral Name;
+  ArrayRef<const char *> Exts;
+};
+
+static constexpr ImpliedExtsEntry ImpliedExts[] = {
+    {"v", ImpliedExts_v},
+    {"zfh", ImpliedExts_zfh},
+};
+
 void RISCVISAInfo::updateImplication() {
   bool HasE = Exts.count("e") == 1;
   bool HasI = Exts.count("i") == 1;
-  bool HasV = Exts.count("v") == 1;
-  bool HasZfh = Exts.count("zfh") == 1;
 
   // If not in e extension and i extension does not exist, i extension is
   // implied
@@ -708,14 +719,16 @@
     addExtension("i", Version->Major, Version->Minor);
   }
 
-  if (HasV) {
-    auto Version = findDefaultVersion("zvlsseg");
-    addExtension("zvlsseg", Version->Major, Version->Minor);
-  }
-
-  if (HasZfh) {
-    auto Version = findDefaultVersion("zfhmin");
-    addExtension("zfhmin", Version->Major, Version->Minor);
+  for (auto &Ext : Exts) {
+    auto I = llvm::lower_bound(ImpliedExts, Ext.first,
+                               [](const ImpliedExtsEntry &Entry,
+                                  StringRef Ext) { return Entry.Name < Ext; });
+    if (I != std::end(ImpliedExts) && I->Name == Ext.first) {
+      for (auto &ImpliedExt : I->Exts) {
+        auto Version = findDefaultVersion(ImpliedExt);
+        addExtension(ImpliedExt, Version->Major, Version->Minor);
+      }
+    }
   }
 }
 


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