diff --git a/js/src/Makefile.in b/js/src/Makefile.in
--- a/js/src/Makefile.in
+++ b/js/src/Makefile.in
@@ -332,30 +332,33 @@ CPPSRCS += 	checks.cc \
 		platform.cc \
 		utils.cc \
 		$(NONE)
 
 #
 # END enclude sources for V8 dtoa
 #############################################
 
-# For architectures without YARR JIT, PCRE is faster than the YARR
-# interpreter (bug 684559).
-
 ifeq (,$(filter arm% sparc %86 x86_64 mips%,$(TARGET_CPU)))
 
-VPATH +=        $(srcdir)/yarr/pcre \
+VPATH +=	$(srcdir)/assembler \
+		$(srcdir)/assembler/wtf \
+		$(srcdir)/assembler/jit \
+		$(srcdir)/yarr \
 		$(NULL)
 
-CPPSRCS += \
-                pcre_compile.cpp \
-                pcre_exec.cpp \
-                pcre_tables.cpp \
-                pcre_xclass.cpp \
-                pcre_ucp_searchfuncs.cpp \
+CPPSRCS +=	ExecutableAllocator.cpp \
+		ExecutableAllocatorPosix.cpp \
+		OSAllocatorOS2.cpp \
+		OSAllocatorPosix.cpp \
+		OSAllocatorWin.cpp \
+		PageBlock.cpp \
+		YarrInterpreter.cpp \
+		YarrPattern.cpp \
+		YarrSyntaxChecker.cpp \
 		$(NULL)
 else
 
 ###############################################
 # BEGIN include sources for the Nitro assembler
 #
 
 ENABLE_YARR_JIT = 1
diff --git a/js/src/assembler/jit/ExecutableAllocator.h b/js/src/assembler/jit/ExecutableAllocator.h
--- a/js/src/assembler/jit/ExecutableAllocator.h
+++ b/js/src/assembler/jit/ExecutableAllocator.h
@@ -462,18 +462,16 @@ public:
             : "r" (code), "r" (reinterpret_cast<char*>(code) + size)
             : "r0", "r1", "r2");
     }
 #elif WTF_CPU_SPARC
     static void cacheFlush(void* code, size_t size)
     {
         sync_instruction_memory((caddr_t)code, size);
     }
-#else
-    #error "The cacheFlush support is missing on this platform."
 #endif
 
 private:
 
 #if ENABLE_ASSEMBLER_WX_EXCLUSIVE
     static void reprotectRegion(void*, size_t, ProtectionSetting);
 #endif
 
diff --git a/js/src/vm/RegExpObject-inl.h b/js/src/vm/RegExpObject-inl.h
--- a/js/src/vm/RegExpObject-inl.h
+++ b/js/src/vm/RegExpObject-inl.h
@@ -132,16 +132,17 @@ RegExpObject::setMultiline(bool enabled)
 }
 
 inline void
 RegExpObject::setSticky(bool enabled)
 {
     setSlot(STICKY_FLAG_SLOT, BooleanValue(enabled));
 }
 
+#if ENABLE_YARR_JIT
 /* This function should be deleted once bad Android platforms phase out. See bug 604774. */
 inline bool
 detail::RegExpCode::isJITRuntimeEnabled(JSContext *cx)
 {
 #if defined(ANDROID) && defined(JS_METHODJIT)
     return cx->methodJitEnabled;
 #else
     return true;
diff --git a/js/src/vm/RegExpObject.cpp b/js/src/vm/RegExpObject.cpp
--- a/js/src/vm/RegExpObject.cpp
+++ b/js/src/vm/RegExpObject.cpp
@@ -162,17 +162,16 @@ MatchPairs::checkAgainst(size_t inputLen
             continue;
         JS_ASSERT(size_t(p.limit) <= inputLength);
     }
 #endif
 }
 
 /* detail::RegExpCode */
 
-#if ENABLE_YARR_JIT
 void
 RegExpCode::reportYarrError(JSContext *cx, TokenStream *ts, ErrorCode error)
 {
     switch (error) {
       case JSC::Yarr::NoError:
         JS_NOT_REACHED("Called reportYarrError with value for no error");
         return;
 #define COMPILE_EMSG(__code, __msg)                                                              \
@@ -194,52 +193,16 @@ RegExpCode::reportYarrError(JSContext *c
       COMPILE_EMSG(QuantifierTooLarge, JSMSG_BAD_QUANTIFIER);
       COMPILE_EMSG(EscapeUnterminated, JSMSG_TRAILING_SLASH);
 #undef COMPILE_EMSG
       default:
         JS_NOT_REACHED("Unknown Yarr error code");
     }
 }
 
-#else /* !ENABLE_YARR_JIT */
-
-void
-RegExpCode::reportPCREError(JSContext *cx, int error)
-{
-#define REPORT(msg_) \
-    JS_ReportErrorFlagsAndNumberUC(cx, JSREPORT_ERROR, js_GetErrorMessage, NULL, msg_); \
-    return
-    switch (error) {
-      case -2: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 0: JS_NOT_REACHED("Precondition violation: an error must have occurred.");
-      case 1: REPORT(JSMSG_TRAILING_SLASH);
-      case 2: REPORT(JSMSG_TRAILING_SLASH);
-      case 3: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 4: REPORT(JSMSG_BAD_QUANTIFIER);
-      case 5: REPORT(JSMSG_BAD_QUANTIFIER);
-      case 6: REPORT(JSMSG_BAD_CLASS_RANGE);
-      case 7: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 8: REPORT(JSMSG_BAD_CLASS_RANGE);
-      case 9: REPORT(JSMSG_BAD_QUANTIFIER);
-      case 10: REPORT(JSMSG_UNMATCHED_RIGHT_PAREN);
-      case 11: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 12: REPORT(JSMSG_UNMATCHED_RIGHT_PAREN);
-      case 13: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 14: REPORT(JSMSG_MISSING_PAREN);
-      case 15: REPORT(JSMSG_BAD_BACKREF);
-      case 16: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      case 17: REPORT(JSMSG_REGEXP_TOO_COMPLEX);
-      default:
-        JS_NOT_REACHED("Precondition violation: unknown PCRE error code.");
-    }
-#undef REPORT
-}
-
-#endif /* ENABLE_YARR_JIT */
-
 bool
 RegExpCode::compile(JSContext *cx, JSLinearString &pattern, unsigned *parenCount, RegExpFlag flags)
 {
 #if ENABLE_YARR_JIT
     /* Parse the pattern. */
     ErrorCode yarrError;
     YarrPattern yarrPattern(pattern, bool(flags & IgnoreCaseFlag), bool(flags & MultilineFlag),
                             &yarrError);
diff --git a/js/src/vm/RegExpObject.h b/js/src/vm/RegExpObject.h
--- a/js/src/vm/RegExpObject.h
+++ b/js/src/vm/RegExpObject.h
@@ -46,20 +46,18 @@
 #include <stddef.h>
 #include "jsobj.h"
 
 #include "js/TemplateLib.h"
 
 #include "yarr/Yarr.h"
 #if ENABLE_YARR_JIT
 #include "yarr/YarrJIT.h"
+#endif
 #include "yarr/YarrSyntaxChecker.h"
-#else
-#include "yarr/pcre/pcre.h"
-#endif
 
 /*
  * JavaScript Regular Expressions
  *
  * There are several engine concepts associated with a single logical regexp:
  *
  *   RegExpObject - The JS-visible object whose .[[Class]] equals "RegExp"
  *
diff --git a/js/src/yarr/wtfbridge.h b/js/src/yarr/wtfbridge.h
--- a/js/src/yarr/wtfbridge.h
+++ b/js/src/yarr/wtfbridge.h
@@ -44,19 +44,17 @@
  * WTF compatibility layer. This file provides various type and data
  * definitions for use by Yarr.
  */
 
 #include "jsstr.h"
 #include "jsprvtd.h"
 #include "vm/String.h"
 #include "assembler/wtf/Platform.h"
-#if ENABLE_YARR_JIT
 #include "assembler/jit/ExecutableAllocator.h"
-#endif
 
 namespace JSC { namespace Yarr {
 
 /*
  * Basic type definitions.
  */
 
 typedef jschar UChar;