MIPS64: Use BOVC/BNVC for overflow checking on r6.

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 216f4b996f2503dc9503c3cde7ebeca5020f47b9..37574efd3efb5391cfe0dc3f022c97ea7180886a 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -1298,32 +1298,41 @@ class MacroAssembler: public Assembler {
   // Usage: first call the appropriate arithmetic function, then call one of the
   // jump functions with the overflow_dst register as the second parameter.
 
-  void AdduAndCheckForOverflow(Register dst,
-                               Register left,
-                               Register right,
-                               Register overflow_dst,
-                               Register scratch = at);
+  inline void AddBranchOvf(Register dst, Register left, const Operand& right,
+                           Label* overflow_label, Register scratch = at) {
+    AddBranchOvf(dst, left, right, overflow_label, nullptr, scratch);
+  }
+
+  inline void AddBranchNoOvf(Register dst, Register left, const Operand& right,
+                             Label* no_overflow_label, Register scratch = at) {
+    AddBranchOvf(dst, left, right, nullptr, no_overflow_label, scratch);
+  }
+
+  void AddBranchOvf(Register dst, Register left, const Operand& right,
+                    Label* overflow_label, Label* no_overflow_label,
+                    Register scratch = at);
 
-  void AdduAndCheckForOverflow(Register dst, Register left,
-                               const Operand& right, Register overflow_dst,
-                               Register scratch);
+  void AddBranchOvf(Register dst, Register left, Register right,
+                    Label* overflow_label, Label* no_overflow_label,
+                    Register scratch = at);
 
-  void SubuAndCheckForOverflow(Register dst,
-                               Register left,
-                               Register right,
-                               Register overflow_dst,
-                               Register scratch = at);
+  inline void SubBranchOvf(Register dst, Register left, const Operand& right,
+                           Label* overflow_label, Register scratch = at) {
+    SubBranchOvf(dst, left, right, overflow_label, nullptr, scratch);
+  }
 
-  void SubuAndCheckForOverflow(Register dst, Register left,
-                               const Operand& right, Register overflow_dst,
-                               Register scratch);
+  inline void SubBranchNoOvf(Register dst, Register left, const Operand& right,
+                             Label* no_overflow_label, Register scratch = at) {
+    SubBranchOvf(dst, left, right, nullptr, no_overflow_label, scratch);
+  }
 
-  void DadduAndCheckForOverflow(Register dst, Register left, Register right,
-                                Register overflow_dst, Register scratch = at);
+  void SubBranchOvf(Register dst, Register left, const Operand& right,
+                    Label* overflow_label, Label* no_overflow_label,
+                    Register scratch = at);
 
-  void DadduAndCheckForOverflow(Register dst, Register left,
-                                const Operand& right, Register overflow_dst,
-                                Register scratch);
+  void SubBranchOvf(Register dst, Register left, Register right,
+                    Label* overflow_label, Label* no_overflow_label,
+                    Register scratch = at);
 
   inline void DaddBranchOvf(Register dst, Register left, const Operand& right,
                             Label* overflow_label, Register scratch = at) {
@@ -1343,13 +1352,6 @@ class MacroAssembler: public Assembler {
                      Label* overflow_label, Label* no_overflow_label,
                      Register scratch = at);
 
-  void DsubuAndCheckForOverflow(Register dst, Register left, Register right,
-                                Register overflow_dst, Register scratch = at);
-
-  void DsubuAndCheckForOverflow(Register dst, Register left,
-                                const Operand& right, Register overflow_dst,
-                                Register scratch);
-
   inline void DsubBranchOvf(Register dst, Register left, const Operand& right,
                             Label* overflow_label, Register scratch = at) {
     DsubBranchOvf(dst, left, right, overflow_label, nullptr, scratch);