Fix IP register usage in LoadClassSlowPathARMVIXL.

Request a temporary from a UseScratchRegisterScope instead
of explicitly specifying the IP register to avoid assetion
failure in VIXL.

Test: Build aosp_flounder-userdebug with ART_USE_VIXL_ARM_BACKEND=true
Bug: 34340177
Bug: 30627598
Change-Id: Ie39fbbb66165d752634cde8d2963129641558b93

1 files changed, 4 insertions, 2 deletions

diff --git a/compiler/optimizing/code_generator_arm_vixl.cc b/compiler/optimizing/code_generator_arm_vixl.cc
index 83c289e866..f496d29b59 100644
--- a/compiler/optimizing/code_generator_arm_vixl.cc
+++ b/compiler/optimizing/code_generator_arm_vixl.cc
@@ -431,10 +431,12 @@ class LoadClassSlowPathARMVIXL : public SlowPathCodeARMVIXL {
       // TODO: Change art_quick_initialize_type/art_quick_initialize_static_storage to
       // kSaveEverything and use a temporary for the .bss entry address in the fast path,
       // so that we can avoid another calculation here.
+      UseScratchRegisterScope temps(down_cast<CodeGeneratorARMVIXL*>(codegen)->GetVIXLAssembler());
+      vixl32::Register temp = temps.Acquire();
       CodeGeneratorARMVIXL::PcRelativePatchInfo* labels =
           arm_codegen->NewTypeBssEntryPatch(cls_->GetDexFile(), type_index);
-      arm_codegen->EmitMovwMovtPlaceholder(labels, ip);
-      __ Str(OutputRegister(cls_), MemOperand(ip));
+      arm_codegen->EmitMovwMovtPlaceholder(labels, temp);
+      __ Str(OutputRegister(cls_), MemOperand(temp));
     }
     __ B(GetExitLabel());
   }