ART: Simplify invoke-polymorphic entrypoints

Moves to pattern used by the interpreter bridge and writes the result
in both the regular return register and the floating point result
register.

Add return value tests to 956-method-handles.

Test: art/test.py --host -r -t 956
Test: art/test.py --target --32 -r -t 956
Test: art/test.py --target --64 -r -t 956
Change-Id: I7389d04b70b88e149682f6d656ab185e48bcbf66

1 files changed, 4 insertions, 2 deletions

diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index 4791fa3fba..9f2346db3c 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -516,7 +516,7 @@ void CodeGenerator::CreateCommonInvokeLocationSummary(
         locations->AddTemp(visitor->GetMethodLocation());
         break;
     }
-  } else {
+  } else if (!invoke->IsInvokePolymorphic()) {
     locations->AddTemp(visitor->GetMethodLocation());
   }
 }
@@ -579,7 +579,9 @@ void CodeGenerator::GenerateInvokeUnresolvedRuntimeCall(HInvokeUnresolved* invok
 }
 
 void CodeGenerator::GenerateInvokePolymorphicCall(HInvokePolymorphic* invoke) {
-  MoveConstant(invoke->GetLocations()->GetTemp(0), static_cast<int32_t>(invoke->GetType()));
+  // invoke-polymorphic does not use a temporary to convey any additional information (e.g. a
+  // method index) since it requires multiple info from the instruction (registers A, B, H). Not
+  // using the reservation has no effect on the registers used in the runtime call.
   QuickEntrypointEnum entrypoint = kQuickInvokePolymorphic;
   InvokeRuntime(entrypoint, invoke, invoke->GetDexPc(), nullptr);
 }