Unify branch flags, pretty printer for OpKind.

LIR operand 0 is always an offset for a branch. This is clear in
conditional branches that are binary and have the 2nd operand as the
condition codes of the branch. This changes unconditional branches to be
unary and therefore more intention revealing that the 1st operand will
be used by the assembler to hold an offset.

A << operator for OpKind allows easy pretty printing.

Change-Id: I933b8e0bf43f5be3eff13f93c3fc1539ae526840

3 files changed, 5 insertions, 12 deletions

diff --git a/src/compiler/codegen/arm/Assemble.cc b/src/compiler/codegen/arm/Assemble.cc
index 2c13107ce7..2a89b6aca7 100644
--- a/src/compiler/codegen/arm/Assemble.cc
+++ b/src/compiler/codegen/arm/Assemble.cc
@@ -147,7 +147,7 @@ const ArmEncodingMap EncodingMap[kArmLast] = {
                  NEEDS_FIXUP, "b!1c", "!0t", 2),
     ENCODING_MAP(kThumbBUncond,      0xe000,
                  kFmtBitBlt, 10, 0, kFmtUnused, -1, -1, kFmtUnused, -1, -1,
-                 kFmtUnused, -1, -1, NO_OPERAND | IS_BRANCH | NEEDS_FIXUP,
+                 kFmtUnused, -1, -1, IS_UNARY_OP | IS_BRANCH | NEEDS_FIXUP,
                  "b", "!0t", 2),
     ENCODING_MAP(kThumbBicRR,        0x4380,
                  kFmtBitBlt, 2, 0, kFmtBitBlt, 5, 3, kFmtUnused, -1, -1,
diff --git a/src/compiler/codegen/arm/Thumb2/Factory.cc b/src/compiler/codegen/arm/Thumb2/Factory.cc
index 1810573daa..ad6e40d608 100644
--- a/src/compiler/codegen/arm/Thumb2/Factory.cc
+++ b/src/compiler/codegen/arm/Thumb2/Factory.cc
@@ -188,17 +188,10 @@ LIR* loadConstantNoClobber(CompilationUnit* cUnit, int rDest, int value)
     return res;
 }
 
-LIR* opNone(CompilationUnit* cUnit, OpKind op)
+LIR* opBranchUnconditional(CompilationUnit* cUnit, OpKind op)
 {
-    ArmOpcode opcode = kThumbBkpt;
-    switch (op) {
-        case kOpUncondBr:
-            opcode = kThumbBUncond;
-            break;
-        default:
-            LOG(FATAL) << "Bad opcode " << (int)op;
-    }
-    return newLIR0(cUnit, opcode);
+    DCHECK_EQ(op, kOpUncondBr);
+    return newLIR1(cUnit, kThumbBUncond, 0 /* offset to be patched */);
 }
 
 LIR* opCondBranch(CompilationUnit* cUnit, ConditionCode cc, LIR* target)
diff --git a/src/compiler/codegen/arm/Thumb2/Gen.cc b/src/compiler/codegen/arm/Thumb2/Gen.cc
index 557e87b470..20124f9d05 100644
--- a/src/compiler/codegen/arm/Thumb2/Gen.cc
+++ b/src/compiler/codegen/arm/Thumb2/Gen.cc
@@ -326,7 +326,7 @@ void genMonitorExit(CompilationUnit* cUnit, MIR* mir, RegLocation rlSrc)
     hopBranch = opCondBranch(cUnit, kCondNe, NULL);
     oatGenMemBarrier(cUnit, kSY);
     storeWordDisp(cUnit, r0, Object::MonitorOffset().Int32Value(), r3);
-    branch = opNone(cUnit, kOpUncondBr);
+    branch = opBranchUnconditional(cUnit, kOpUncondBr);
 
     hopTarget = newLIR0(cUnit, kPseudoTargetLabel);
     hopBranch->target = (LIR*)hopTarget;