[llvm] [LSR][RISCV] Add cmp/branch support (PR #178039)

[Michael Berg via llvm-commits]

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@@ -481,6 +477,8 @@ class RISCVTTIImpl final : public BasicTTIImplBase<RISCVTTIImpl> {
     llvm_unreachable("unknown register class");
   }
 
+  bool canMacroFuseCmp() const override;
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mcberg2021 wrote:

I'll add an internal action item to look into changing the cost analysis for LSR for the cmp/branch case in our downstream compiler.  Closing this PR.

https://github.com/llvm/llvm-project/pull/178039