craig.topper added inline comments.

================
Comment at: llvm/lib/Target/RISCV/RISCV.td:25
+                       "'M' (Integer Multiplication and Division)",
+                       [FeatureStdExtZmmul]>;
 def HasStdExtM : Predicate<"Subtarget->hasStdExtM()">,
----------------
This will cause Zmmul to appear in the ELF attributes any time is M is enabled. 
Is that what we want?


================
Comment at: llvm/test/CodeGen/RISCV/attributes.ll:76
 
-; RV32M: .attribute 5, "rv32i2p0_m2p0"
+; RV32M: .attribute 5, "rv32i2p0_m2p0_zmmul0p1"
 ; RV32A: .attribute 5, "rv32i2p0_a2p0"
----------------
Is this a backwards compatibility issue?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103313/new/

https://reviews.llvm.org/D103313

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