[RISCV] Add groupid/bitmask for RISC-V extension

Base on riscv-non-isa/riscv-c-api-doc#74. This patch defines the groupid/bitmask in RISCVFeatures.td and generates the corresponding table in RISCVTargetParserDef.inc. The groupid/bitmask of extensions provides an abstraction layer between the compiler and runtime functions.
BeMg · Jun 5, 2024 · 0d4af6e · 0d4af6e
1 parent 79b1137
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diff --git a/llvm/include/llvm/TargetParser/RISCVTargetParser.h b/llvm/include/llvm/TargetParser/RISCVTargetParser.h
@@ -24,6 +24,14 @@ class Triple;
 
 namespace RISCV {
 
+namespace RISCVExtensionBitmaskTable {
+struct RISCVExtensionBitmask {
+  const char *Name;
+  unsigned GroupID;
+  unsigned long long Bitmask;
+};
+} // namespace RISCVExtensionBitmaskTable
+
 // We use 64 bits as the known part in the scalable vector types.
 static constexpr unsigned RVVBitsPerBlock = 64;