DBC: Implement TestSmi instruction.

runtime/vm/constants_dbc.h

Index: runtime/vm/constants_dbc.h
diff --git a/runtime/vm/constants_dbc.h b/runtime/vm/constants_dbc.h
index 02d86888895143cace97b15c664afd4670ed97a6..90e96dcfa291b45a058ab071470800902b6d9a3f 100644
--- a/runtime/vm/constants_dbc.h
+++ b/runtime/vm/constants_dbc.h
@@ -365,6 +365,11 @@ namespace dart {
 //
 //    Assert that TOS is a boolean (A = 1) or that TOS is not null (A = 0).
 //
+//  - TestSmi rA, rD
+//
+//    If FP[rA] & FP[rD] != 0, then skip the next instruction. FP[rA] and FP[rD]
+//    must be Smis.
+//
 //  - CheckSmi rA
 //
 //    If FP[rA] is a Smi, then skip the next instruction.
@@ -520,6 +525,7 @@ namespace dart {
   V(InstanceOf,                      A, num, ___, ___) \
   V(AssertAssignable,                D, num, lit, ___) \
   V(AssertBoolean,                   A, num, ___, ___) \
+  V(TestSmi,                       A_D, reg, reg, ___) \
   V(CheckSmi,                        A, reg, ___, ___) \
   V(CheckClassId,                  A_D, reg, lit, ___) \
   V(CheckStack,                      0, ___, ___, ___) \
@@ -639,7 +645,7 @@ enum FpuRegister {
 const FpuRegister FpuTMP = kFakeFpuRegister;
 const intptr_t kNumberOfFpuRegisters = 1;
 
-enum Condition { EQ, NE };
+enum Condition { NEXT_IS_TRUE, NEXT_IS_FALSE };

[zra, 2016/06/29 22:57:01]

Add some comments here about what these mean.

[rmacnak, 2016/06/29 23:53:51]

Done.

 
 }  // namespace dart