Continues Latin-1 support. All tests pass with ENABLE_LATIN_1 flag.

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 326 matching lines @@
     Label loop;
     __ bind(&loop);
     __ movzx_b(eax, Operand(edi, 0));
     __ cmpb_al(Operand(edx, 0));
     __ j(equal, &loop_increment);
 
     // Mismatch, try case-insensitive match (converting letters to lower-case).
     __ or_(eax, 0x20);  // Convert match character to lower-case.
     __ lea(ecx, Operand(eax, -'a'));
     __ cmp(ecx, static_cast<int32_t>('z' - 'a'));  // Is eax a lowercase letter?
-    __ j(above, &fail);
+#ifndef ENABLE_LATIN_1
+    __ j(above, &fail);  // Weren't letters anyway.
+#else
+    Label convert_capture;
+    __ j(below_equal, &convert_capture);  // In range 'a'-'z'.
+    // Latin-1: Check for values in range [224,254] but not 247.
+    __ sub(ecx, Immediate(224 - 'a'));
+    __ cmp(ecx, Immediate(254 - 224));
+    __ j(above, &fail);  // Weren't Latin-1 letters.
+    __ cmp(ecx, Immediate(247 - 224));  // Check for 247.
+    __ j(equal, &fail);
+    __ bind(&convert_capture);
+#endif
     // Also convert capture character.
     __ movzx_b(ecx, Operand(edx, 0));
     __ or_(ecx, 0x20);
 
     __ cmp(eax, ecx);
     __ j(not_equal, &fail);
 
     __ bind(&loop_increment);
     // Increment pointers into match and capture strings.
     __ add(edx, Immediate(1));
@@ skipping 1041 matching lines @@
 }
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32