Remove unnecessary code for non-zero-length global regexps.

src/ia32/regexp-macro-assembler-ia32.cc

 // Copyright 2012 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 839 matching lines @@
       __ mov(ecx, Operand(ebp, kInputEnd));
       __ mov(edx, Operand(ebp, kStartIndex));
       __ sub(ecx, Operand(ebp, kInputStart));
       if (mode_ == UC16) {
         __ lea(ecx, Operand(ecx, edx, times_2, 0));
       } else {
         __ add(ecx, edx);
       }
       for (int i = 0; i < num_saved_registers_; i++) {
         __ mov(eax, register_location(i));
-        if (i == 0 && global()) {
+        if (i == 0 && global_with_zero_length_match()) {
           // Keep capture start in edx for the zero-length check later.
           __ mov(edx, eax);
         }
         // Convert to index from start of string, not end.
         __ add(eax, ecx);
         if (mode_ == UC16) {
           __ sar(eax, 1);  // Convert byte index to character index.
         }
         __ mov(Operand(ebx, i * kPointerSize), eax);
       }
@@ skipping 12 matching lines @@
       __ j(less, &exit_label_);
 
       __ mov(Operand(ebp, kNumOutputRegisters), ecx);
       // Advance the location for output.
       __ add(Operand(ebp, kRegisterOutput),
              Immediate(num_saved_registers_ * kPointerSize));
 
       // Prepare eax to initialize registers with its value in the next run.
       __ mov(eax, Operand(ebp, kInputStartMinusOne));
 
-      // Special case for zero-length matches.
-      // edx: capture start index
-      __ cmp(edi, edx);
-      // Not a zero-length match, restart.
-      __ j(not_equal, &load_char_start_regexp);
-      // edi (offset from the end) is zero if we already reached the end.
-      __ test(edi, edi);
-      __ j(zero, &exit_label_, Label::kNear);
-      // Advance current position after a zero-length match.
-      if (mode_ == UC16) {
-        __ add(edi, Immediate(2));
-      } else {
-        __ inc(edi);
+      if (global_with_zero_length_match()) {
+        // Special case for zero-length matches.
+        // edx: capture start index
+        __ cmp(edi, edx);
+        // Not a zero-length match, restart.
+        __ j(not_equal, &load_char_start_regexp);
+        // edi (offset from the end) is zero if we already reached the end.
+        __ test(edi, edi);
+        __ j(zero, &exit_label_, Label::kNear);
+        // Advance current position after a zero-length match.
+        if (mode_ == UC16) {
+          __ add(edi, Immediate(2));
+        } else {
+          __ inc(edi);
+        }
       }
+
       __ jmp(&load_char_start_regexp);
     } else {
       __ mov(eax, Immediate(SUCCESS));
     }
   }
 
   __ bind(&exit_label_);
   if (global()) {
     // Return the number of successful captures.
     __ mov(eax, Operand(ebp, kSuccessfulCaptures));
@@ skipping 481 matching lines @@
 }
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32