A64: fix out-of-range conditional jump in RegExpMacroAssemblerA64.

src/a64/regexp-macro-assembler-a64.cc

Index: src/a64/regexp-macro-assembler-a64.cc
diff --git a/src/a64/regexp-macro-assembler-a64.cc b/src/a64/regexp-macro-assembler-a64.cc
index 8bd9c60b0e9421bbffc7b6e4f6ba2ce82b01931c..49feba6f76a0c4db6a0ceec279d5890c87972c0c 100644
--- a/src/a64/regexp-macro-assembler-a64.cc
+++ b/src/a64/regexp-macro-assembler-a64.cc
@@ -1455,10 +1455,14 @@ void RegExpMacroAssemblerA64::BranchOrBacktrack(Condition condition,
     return;
   }
   if (to == NULL) {
-    __ B(condition, &backtrack_label_);
-    return;
+    to = &backtrack_label_;
   }
-  __ B(condition, to);
+  // TODO(ulan): do direct jump when jump distance is known and fits in imm19.
+  Condition inverted_condition = InvertCondition(condition);
+  Label no_branch;
+  __ B(inverted_condition, &no_branch);
+  __ B(to);
+  __ Bind(&no_branch);
 }
 
 void RegExpMacroAssemblerA64::CompareAndBranchOrBacktrack(Register reg,
@@ -1469,11 +1473,15 @@ void RegExpMacroAssemblerA64::CompareAndBranchOrBacktrack(Register reg,
     if (to == NULL) {
       to = &backtrack_label_;
     }
+    // TODO(ulan): do direct jump when jump distance is known and fits in imm19.
+    Label no_branch;
     if (condition == eq) {
-      __ Cbz(reg, to);
+      __ Cbnz(reg, &no_branch);
     } else {
-      __ Cbnz(reg, to);
+      __ Cbz(reg, &no_branch);
     }
+    __ B(to);
+    __ Bind(&no_branch);
   } else {
     __ Cmp(reg, immediate);
     BranchOrBacktrack(condition, to);