[AArch64] Add PreTest for optimizing MOV to STP

Author: ParkHanbum

llvm/test/CodeGen/AArch64/movimm-expand-ldst.mir

@@ -31,3 +31,43 @@ body:             |
     ; CHECK-NEXT: RET undef $lr, implicit $x0
     renamable $x0 = MOVi64imm -4550323095879417536
     RET_ReallyLR implicit $x0
+...
+---
+name: test_fold_repeating_constant_load_store_twice
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    liveins: $x0, $x1
+    ; CHECK-LABEL: name: test_fold_repeating_constant_load_store_twice
+    ; CHECK: liveins: $x0, $x1
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: renamable $x8 = MOVZXi 49370, 0
+    ; CHECK-NEXT: renamable $x8 = MOVKXi $x8, 320, 16
+    ; CHECK-NEXT: renamable $x8 = ORRXrs $x8, $x8, 32
+    ; CHECK-NEXT: STRXui renamable $x8, killed renamable $x0, 0
+    ; CHECK-NEXT: STRXui killed renamable $x8, killed renamable $x1, 0
+    ; CHECK-NEXT: RET undef $lr
+    renamable $x8 = MOVi64imm 90284035103834330
+    STRXui renamable $x8, killed renamable $x0, 0
+    STRXui killed renamable $x8, killed renamable $x1, 0
+    RET_ReallyLR
+...
+---
+name: test_fold_repeating_constant_load_use_reg_before_store
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    liveins: $x0
+    ; CHECK-LABEL: name: test_fold_repeating_constant_load_use_reg_before_store
+    ; CHECK: liveins: $x0
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: renamable $x8 = MOVZXi 49370, 0
+    ; CHECK-NEXT: renamable $x8 = MOVKXi $x8, 320, 16
+    ; CHECK-NEXT: renamable $x8 = ORRXrs $x8, $x8, 32
+    ; CHECK-NEXT: renamable $x9 = ADDXrs renamable $x8, renamable $x8, 32
+    ; CHECK-NEXT: STRXui renamable $x8, killed renamable $x0, 0
+    ; CHECK-NEXT: RET undef $lr
+    renamable $x8 = MOVi64imm 90284035103834330
+    renamable $x9 = ADDXrs renamable $x8, renamable $x8, 32
+    STRXui renamable $x8, killed renamable $x0, 0
+    RET_ReallyLR