[RISCV] Add isMoveReg to vmv1r/vmv2r/vmv4r/vmv8r.v.

This allows TII isCopyInstrImpl to consider them copies.

Reviewed By: wangpc

Differential Revision: https://reviews.llvm.org/D155140

diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoV.td b/llvm/lib/Target/RISCV/RISCVInstrInfoV.td
index 6cf3dbd..6e5ee80 100644 (file)
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoV.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoV.td
@@ -1683,7 +1683,7 @@ let Constraints = "@earlyclobber $vd", RVVConstraint = Vcompress in {
 defm VCOMPRESS_V : VCPR_MV_Mask<"vcompress", 0b010111>;
 } // Constraints = "@earlyclobber $vd", RVVConstraint = Vcompress
 
-let hasSideEffects = 0, mayLoad = 0, mayStore = 0,
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0, isMoveReg = 1,
     RVVConstraint = NoConstraint in {
 // A future extension may relax the vector register alignment restrictions.
 foreach n = [1, 2, 4, 8] in {

diff --git a/llvm/test/CodeGen/RISCV/rvv/copyprop.mir b/llvm/test/CodeGen/RISCV/rvv/copyprop.mir
index 7c94299..eb4c8bf 100644 (file)
--- a/llvm/test/CodeGen/RISCV/rvv/copyprop.mir
+++ b/llvm/test/CodeGen/RISCV/rvv/copyprop.mir
@@ -23,8 +23,7 @@
   ; CHECK-NEXT:    li a2, 128
   ; CHECK-NEXT:    bgeu a0, a2, .LBB0_2
   ; CHECK-NEXT:  .LBB0_4: # %entry
-  ; CHECK-NEXT:    vmv1r.v v8, v9
-  ; CHECK-NEXT:    vse64.v v8, (a1)
+  ; CHECK-NEXT:    vse64.v v9, (a1)
   ; CHECK-NEXT:    ret
   entry:
     ret void