A64: Replace a Cmp/Branch sequence by a conditional compare.

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

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 345 matching lines @@
     // Mismatch, try case-insensitive match (converting letters to lower-case).
     __ Orr(w10, w10, 0x20);  // Convert capture character to lower-case.
     __ Orr(w11, w11, 0x20);  // Also convert input character.
     __ Cmp(w11, w10);
     __ B(ne, &fail);
     __ Sub(w10, w10, 'a');
     __ Cmp(w10, 'z' - 'a');  // Is w10 a lowercase letter?
     __ B(ls, &loop_check);  // In range 'a'-'z'.
     // Latin-1: Check for values in range [224,254] but not 247.
     __ Sub(w10, w10, 224 - 'a');
-    // TODO(jbramley): Use Ccmp here.
     __ Cmp(w10, 254 - 224);
-    __ B(hi, &fail);  // Weren't Latin-1 letters.
-    __ Cmp(w10, 247 - 224);  // Check for 247.
-    __ B(eq, &fail);
+    __ Ccmp(w10, 247 - 224, ZFlag, ls);  // Check for 247.
+    __ B(eq, &fail);  // Weren't Latin-1 letters.
 
     __ Bind(&loop_check);
     __ Cmp(capture_start_address, capture_end_addresss);
     __ B(lt, &loop);
     __ B(&success);
 
     __ Bind(&fail);
     BranchOrBacktrack(al, on_no_match);
 
     __ Bind(&success);
@@ skipping 1340 matching lines @@
       __ Ldrh(current_character(), MemOperand(input_end(), offset, SXTW));
     }
   }
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64