Record a correct deoptimization environment for slow-path code.

runtime/vm/locations.h

Index: runtime/vm/locations.h
diff --git a/runtime/vm/locations.h b/runtime/vm/locations.h
index 24bf0a036dcb6dc65daaa2c5b56427e4d0dac8ce..8e34046ad92e15052aa8f23a5e72962bc2e55484 100644
--- a/runtime/vm/locations.h
+++ b/runtime/vm/locations.h
@@ -368,15 +368,10 @@ class RegisterSet : public ValueObject {
     return (fpu_registers_ & (1 << fpu_reg)) != 0;
   }
 
-  intptr_t fpu_regs_count() const {
-    intptr_t count = 0;
-    for (intptr_t reg_idx = 0; reg_idx < kNumberOfFpuRegisters; reg_idx++) {
-      if (ContainsFpuRegister(static_cast<FpuRegister>(reg_idx))) {
-        count++;
-      }
-    }
-    return count;
-  }
+  intptr_t CpuRegisterCount() const { return RegisterCount(cpu_registers_); }

[Florian Schneider, 2013/10/17 14:38:52]

I don't see that function used anywhere. Do you anticipate a use for it?

+  intptr_t FpuRegisterCount() const { return RegisterCount(fpu_registers_); }
+
+  static intptr_t RegisterCount(intptr_t registers);
 
   intptr_t cpu_registers() const { return cpu_registers_; }
   intptr_t fpu_registers() const { return fpu_registers_; }