From a11eeb4d4a99f61c2626ce2c0d44175a9eaa2c59 Mon Sep 17 00:00:00 2001
From: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
Date: Tue, 25 Aug 2020 15:45:06 +0100
Subject: [PATCH] [RISC-V] Mark C_MV as a move instruction

Reviewed By: luismarques

Differential Revision: https://reviews.llvm.org/D86517
---
 llvm/lib/Target/RISCV/RISCVInstrInfoC.td | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
index f687678..a9960ea 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
@@ -519,7 +519,8 @@ def C_JR : RVInst16CR<0b1000, 0b10, (outs), (ins GPRNoX0:$rs1),
   let rs2 = 0;
 }
 
-let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0, isMoveReg = 1,
+    isAsCheapAsAMove = 1 in
 def C_MV : RVInst16CR<0b1000, 0b10, (outs GPRNoX0:$rs1), (ins GPRNoX0:$rs2),
                       "c.mv", "$rs1, $rs2">,
            Sched<[WriteIALU, ReadIALU]>;
-- 
2.7.4