MIPS: r6 compact branch optimization.

src/mips/constants-mips.cc

Index: src/mips/constants-mips.cc
diff --git a/src/mips/constants-mips.cc b/src/mips/constants-mips.cc
index ff8a79f1b2246870e4ec1e221f965c2deff05aa0..538c64c845d3aa8d99e73ed3456c21430cf8497a 100644
--- a/src/mips/constants-mips.cc
+++ b/src/mips/constants-mips.cc
@@ -127,20 +127,23 @@ int FPURegisters::Number(const char* name) {
 // Instructions.
 
 bool Instruction::IsForbiddenInBranchDelay() const {
-  const int op = OpcodeFieldRaw();
-  switch (op) {
+  switch (OpcodeFieldRaw()) {
     case J:
     case JAL:
     case BEQ:
     case BNE:
-    case BLEZ:
-    case BGTZ:
+    case BLEZ:  // POP06
+    case BGTZ:  // POP07
     case BEQL:
     case BNEL:
-    case BLEZL:
-    case BGTZL:
+    case BLEZL:  // POP26
+    case BGTZL:  // POP27
     case BC:
     case BALC:
+    case POP10:
+    case POP30:
+    case POP66:
+    case POP76:
       return true;
     case REGIMM:
       switch (RtFieldRaw()) {
@@ -169,8 +172,7 @@ bool Instruction::IsForbiddenInBranchDelay() const {
 
 
 bool Instruction::IsLinkingInstruction() const {
-  const int op = OpcodeFieldRaw();
-  switch (op) {
+  switch (OpcodeFieldRaw()) {
     case JAL:
       return true;
     case POP76: