[EraVM] Set AllowRegisterRenaming to 1

MachineCopyPropagation optimization only works if registers
are renamable, so we need to allow register renaming to enable
this optimization for EraVM.

Signed-off-by: Vladimir Radosavljevic <[email protected]>

Author: vladimirradosavljevic

llvm/lib/Target/EraVM/EraVM.td

@@ -62,4 +62,5 @@ def EraVMAsmParser : AsmParser {
 def EraVM : Target {
   let InstructionSet = EraVMInstrInfo;
   let AssemblyParsers = [EraVMAsmParser];
+  let AllowRegisterRenaming = 1;
 }

llvm/test/CodeGen/EraVM/machine-cp-bwd-prop.mir

@@ -18,8 +18,7 @@ body:             |
     ; CHECK-LABEL: name: test
     ; CHECK: liveins: $r2, $r3
     ; CHECK-NEXT: {{  $}}
-    ; CHECK-NEXT: $r4 = SUBrrr_s killed $r2, killed $r3, i256 0
-    ; CHECK-NEXT: $r1 = COPY killed $r4
+    ; CHECK-NEXT: renamable $r1 = SUBrrr_s killed renamable $r2, killed renamable $r3, i256 0
     ; CHECK-NEXT: RET 0, implicit $r1
     renamable $r4 = SUBrrr_s killed renamable $r2, killed renamable $r3, i256 0
     renamable $r1 = COPY killed renamable $r4

llvm/test/CodeGen/EraVM/machine-cp-fwd-prop.mir

@@ -18,8 +18,7 @@ body:             |
     ; CHECK-LABEL: name: test
     ; CHECK: liveins: $r2, $r3
     ; CHECK-NEXT: {{  $}}
-    ; CHECK-NEXT: $r4 = COPY killed $r2
-    ; CHECK-NEXT: $r1 = SUBrrr_s killed $r4, killed $r3, i256 0
+    ; CHECK-NEXT: renamable $r1 = SUBrrr_s $r2, killed renamable $r3, i256 0
     ; CHECK-NEXT: RET 0, implicit $r1
     renamable $r4 = COPY killed renamable $r2
     renamable $r1 = SUBrrr_s killed renamable $r4, killed renamable $r3, i256 0

llvm/test/CodeGen/EraVM/overflow-neg.ll

@@ -31,7 +31,7 @@ define void @add_branch_neg_1(i256 %x, i256 %y) {
 ; CHECK-LABEL: add_branch_neg_1:
 ; CHECK:       ; %bb.0: ; %entry
 ; CHECK-NEXT:    add r1, r0, r3
-; CHECK-NEXT:    add r3, r2, r1
+; CHECK-NEXT:    add r1, r2, r1
 ; CHECK-NEXT:    add! r3, r2, r0
 ; CHECK-NEXT:    jump.lt @.BB1_2
 ; CHECK-NEXT:  ; %bb.1: ; %no_overflow_detected