Internalize strings in-place

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index c8dd417d7f058082697ae4159ff6085a6b2600b0..8b06a743a25a6c460daa3639ea38a8780d5d7ce9 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -425,7 +425,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // (8) Is the external string one byte?  If yes, go to (5).
   // (9) Two byte sequential.  Load regexp code for two byte. Go to (E).
   // (10) Short external string or not a string?  If yes, bail out to runtime.
-  // (11) Sliced string.  Replace subject with parent. Go to (1).
+  // (11) Sliced or thin string.  Replace subject with parent. Go to (1).
 
   Label seq_one_byte_string /* 5 */, seq_two_byte_string /* 9 */,
       external_string /* 7 */, check_underlying /* 1 */,
@@ -733,11 +733,18 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   __ test(ebx, Immediate(kIsNotStringMask | kShortExternalStringTag));
   __ j(not_zero, &runtime);
 
-  // (11) Sliced string.  Replace subject with parent.  Go to (1).
+  // (11) Sliced or thin string.  Replace subject with parent.  Go to (1).
+  Label thin_string;
+  __ cmp(ebx, Immediate(kThinStringTag));
+  __ j(equal, &thin_string, Label::kNear);
   // Load offset into edi and replace subject string with parent.
   __ mov(edi, FieldOperand(eax, SlicedString::kOffsetOffset));
   __ mov(eax, FieldOperand(eax, SlicedString::kParentOffset));
   __ jmp(&check_underlying);  // Go to (1).
+
+  __ bind(&thin_string);
+  __ mov(eax, FieldOperand(eax, ThinString::kActualOffset));
+  __ jmp(&check_underlying);  // Go to (1).
 #endif  // V8_INTERPRETED_REGEXP
 }