Unit tests for 'testb' instruction on ia32 and x64.

runtime/vm/assembler_x64_test.cc

Index: runtime/vm/assembler_x64_test.cc
===================================================================
--- runtime/vm/assembler_x64_test.cc	(revision 42713)
+++ runtime/vm/assembler_x64_test.cc	(working copy)
@@ -297,6 +297,30 @@
 }
 
 
+ASSEMBLER_TEST_GENERATE(Testb, assembler) {
+  Label done;
+  __ movq(RAX, Immediate(1));
+  __ movq(RCX, Immediate(0));
+  __ pushq(Immediate(0xffffff11));
+  __ testb(Address(RSP, 0), Immediate(0x10));
+  // Fail if zero flag set.
+  __ cmoveq(RAX, RCX);
+  __ testb(Address(RSP, 0), Immediate(0x20));
+  // Fail if zero flag not set.
+  __ j(ZERO, &done);

[regis, 2015/01/09 16:30:39]

I guess cmovneq is not implemented :-)

[koda, 2015/01/09 16:37:07]

Exactly :)

+  __ movq(RAX, Immediate(0));
+  __ Bind(&done);
+  __ popq(RCX);
+  __ ret();
+}
+
+
+ASSEMBLER_TEST_RUN(Testb, test) {
+  typedef int (*TestbCode)();
+  EXPECT_EQ(1, reinterpret_cast<TestbCode>(test->entry())());
+}
+
+
 ASSEMBLER_TEST_GENERATE(Increment, assembler) {
   __ movq(RAX, Immediate(0));
   __ pushq(RAX);