Save/restore only live registers in the generator suspend/resume.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index a6c6d0be34761e9153789e2fb672ff4b322e66cd..ebe5f43443bb4c4ec29133e6699f51d6d01fdbc9 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -316,8 +316,10 @@ namespace interpreter {
                                                                                \
   /* Generators */                                                             \
   V(SuspendGenerator, AccumulatorUse::kRead, OperandType::kReg,                \
-    OperandType::kFlag8)                                                       \
+    OperandType::kRegList, OperandType::kRegCount, OperandType::kFlag8)        \
   V(ResumeGenerator, AccumulatorUse::kWrite, OperandType::kReg)                \

[rmcilroy, 2017/06/01 10:44:44]

nit - move ResumeGenerator first

[Jarin, 2017/06/01 12:48:22]

Done.

+  V(RestoreGeneratorRegisters, AccumulatorUse::kWrite, OperandType::kReg,      \
+    OperandType::kRegOutList, OperandType::kRegCount)                          \
                                                                                \
   /* Debugger */                                                               \
   V(Debugger, AccumulatorUse::kNone)                                           \
@@ -821,6 +823,7 @@ class V8_EXPORT_PRIVATE Bytecodes final {
       case OperandType::kRegOutTriple:
         return 3;
       case OperandType::kRegList:
+      case OperandType::kRegOutList:
         UNREACHABLE();
       default:
         return 0;