Port r11704 to MIPS.

BUG=2174
TEST=regexp-global.js

Review URL: https://chromiumcodereview.appspot.com/10538080

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11767 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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

@@ -781,7 +781,7 @@ Handle<HeapObject> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
         for (int i = 0; i < num_saved_registers_; i += 2) {
           __ lw(a2, register_location(i));
           __ lw(a3, register_location(i + 1));
-          if (global()) {
+          if (i == 0 && global_with_zero_length_check()) {
             // Keep capture start in a4 for the zero-length check later.
             __ mov(t7, a2);
           }
@@ -823,6 +823,8 @@ Handle<HeapObject> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
 
         // Prepare a0 to initialize registers with its value in the next run.
         __ lw(a0, MemOperand(frame_pointer(), kInputStartMinusOne));
+
+        if (global_with_zero_length_check()) {
           // Special case for zero-length matches.
           // t7: capture start index
           // Not a zero-length match, restart.
@@ -834,6 +836,8 @@ Handle<HeapObject> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
           __ Addu(current_input_offset(),
                   current_input_offset(),
                   Operand((mode_ == UC16) ? 2 : 1));
+        }
+
         __ Branch(&load_char_start_regexp);
       } else {
         __ li(v0, Operand(SUCCESS));