[llvm] [LLVM][MC] Add support to cull inactive decoders in decoder emitter (PR #154865)

[Sergei Barannikov via llvm-commits]

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@@ -93,6 +94,15 @@ static cl::opt<bool> UseFnTableInDecodeToMCInst(
         "of the generated code."),
     cl::init(false), cl::cat(DisassemblerEmitterCat));
 
+static cl::opt<bool> SpecializeDecodersPerBitwidth(
+    "specialize-decoders-per-bitwidth",
+    cl::desc("Specialize the generated `decodeToMCInst` function per bitwidth. "
+             "Can help reduce the code size. This requires use of different "
+             "`InsnType` for different bitwidths and defining `InsnBitWidth` "
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s-barannikov wrote:

InsnType/InsnBitWidth are probably not very useful in the help message as they require some knowledge of what happens behind the scenes.


https://github.com/llvm/llvm-project/pull/154865