diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index 136e98e89..fa1f89d66 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -720,45 +720,57 @@ LJLIB_CF(ffi_fill)	LJLIB_REC(.)
   return 0;
 }
 
-#define H_(le, be)	LJ_ENDIAN_SELECT(0x##le, 0x##be)
+#define HASH_(l, c1, c2) (((int)(l)) << 16 | ((size_t)(c1)) << 8 | (c2))
+#define H_(s, c1, c2) HASH_(sizeof((s)) - 1, c1, c2)
 
 /* Test ABI string. */
 LJLIB_CF(ffi_abi)	LJLIB_REC(.)
 {
   GCstr *s = lj_lib_checkstr(L, 1);
   int b = 0;
-  switch (s->hash) {
+  int hash = s->len >= 2 ? HASH_(s->len, strdata(s)[0], strdata(s)[1]): 0;
+  switch (hash) {
+#define STR_CASE_(str, c1, c2) case H_(str, c1, c2): if (lj_str_equ(s, str, sizeof(s) - 1)) { break; }
 #if LJ_64
-  case H_(849858eb,ad35fd06): b = 1; break;  /* 64bit */
+  STR_CASE_("64bit", '6', '4'); b = 1; break;  /* 64bit */
 #else
-  case H_(662d3c79,d0e22477): b = 1; break;  /* 32bit */
+  STR_CASE_("32bit", '3', '2'); b = 1; break;  /* 32bit */
 #endif
 #if LJ_ARCH_HASFPU
-  case H_(e33ee463,e33ee463): b = 1; break;  /* fpu */
+  STR_CASE_("fpu", 'f', 'p'); b = 1; break;  /* fpu */
 #endif
 #if LJ_ABI_SOFTFP
-  case H_(61211a23,c2e8c81c): b = 1; break;  /* softfp */
+  STR_CASE_("softfp", 's', 'o'); b = 1; break;  /* softfp */
 #else
-  case H_(539417a8,8ce0812f): b = 1; break;  /* hardfp */
+  STR_CASE_("hardfp", 'h', 'a'); b = 1; break;  /* hardfp */
 #endif
 #if LJ_ABI_EABI
-  case H_(2182df8f,f2ed1152): b = 1; break;  /* eabi */
+  STR_CASE_("eabi", 'e', 'a'); b = 1; break;  /* eabi */
 #endif
 #if LJ_ABI_WIN
-  case H_(4ab624a8,4ab624a8): b = 1; break;  /* win */
+  STR_CASE_("win", 'w', 'i'); b = 1; break;  /* win */
 #endif
-  case H_(3af93066,1f001464): b = 1; break;  /* le/be */
+
+#if LJ_ARCH_ENDIAN == LUAJIT_BE
+  STR_CASE_("'be", 'b', 'e'); b = 1; break;  /* be */
+#else
+  STR_CASE_("le", 'l', 'e'); b = 1; break;  /* le */
+#endif
+
 #if LJ_GC64
-  case H_(9e89d2c9,13c83c92): b = 1; break;  /* gc64 */
+  STR_CASE_("gc64", 'g', 'c'); b = 1; break;  /* gc64 */
 #endif
   default:
     break;
+#undef STR_CASE_
   }
   setboolV(L->top-1, b);
   setboolV(&G(L)->tmptv2, b);  /* Remember for trace recorder. */
   return 1;
 }
 
+#undef HASH_
+#undef E_
 #undef H_
 
 LJLIB_PUSH(top-8) LJLIB_SET(!)  /* Store reference to miscmap table. */
diff --git a/src/lj_cparse.c b/src/lj_cparse.c
index 83cfd1128..cf034d457 100644
--- a/src/lj_cparse.c
+++ b/src/lj_cparse.c
@@ -929,7 +929,8 @@ static CTypeID cp_decl_intern(CPState *cp, CPDecl *decl)
 
 /* -- C declaration parser ------------------------------------------------ */
 
-#define H_(le, be)	LJ_ENDIAN_SELECT(0x##le, 0x##be)
+#define HASH_(l, c1, c2) (((int)(l)) << 16 | ((size_t)(c1)) << 8 | (c2))
+#define H_(s, c1, c2) HASH_((sizeof(s) - 1), c1, c2)
 
 /* Reset declaration state to declaration specifier. */
 static void cp_decl_reset(CPDecl *decl)
@@ -1052,6 +1053,7 @@ static void cp_decl_mode(CPState *cp, CPDecl *decl)
 /* Parse GCC __attribute__((...)). */
 static void cp_decl_gccattribute(CPState *cp, CPDecl *decl)
 {
+  MSize hash = 0;
   cp_next(cp);
   cp_check(cp, '(');
   cp_check(cp, '(');
@@ -1059,50 +1061,49 @@ static void cp_decl_gccattribute(CPState *cp, CPDecl *decl)
     if (cp->tok == CTOK_IDENT) {
       GCstr *attrstr = cp->str;
       cp_next(cp);
-      switch (attrstr->hash) {
-      case H_(64a9208e,8ce14319): case H_(8e6331b2,95a282af):  /* aligned */
-	cp_decl_align(cp, decl);
-	break;
-      case H_(42eb47de,f0ede26c): case H_(29f48a09,cf383e0c):  /* packed */
-	decl->attr |= CTFP_PACKED;
-	break;
-      case H_(0a84eef6,8dfab04c): case H_(995cf92c,d5696591):  /* mode */
-	cp_decl_mode(cp, decl);
-	break;
-      case H_(0ab31997,2d5213fa): case H_(bf875611,200e9990):  /* vector_size */
-	{
-	  CTSize vsize = cp_decl_sizeattr(cp);
-	  if (vsize) CTF_INSERT(decl->attr, VSIZEP, lj_fls(vsize));
-	}
+      hash = attrstr->len >= 2 ?
+             HASH_(attrstr->len, strdata(attrstr)[0], strdata(attrstr)[1]) : 0;
+      switch (hash) {
+#define STR_CASE_(s, c1, c2) case H_(s, c1, c2): if (lj_str_equ(attrstr, s, sizeof(s) - 1)) { break; }
+      STR_CASE_("aligned", 'a', 'l')  /* aligned */
+	cp_decl_align(cp, decl); break;
+      STR_CASE_("packed", 'p', 'a')  /* packed */
+	decl->attr |= CTFP_PACKED; break;
+      STR_CASE_("mode", 'm', 'o')  /* mode */
+	cp_decl_mode(cp, decl); break;
+      STR_CASE_("vector_size", 'v', 'e') /* vector_size */
+	CTSize vsize = cp_decl_sizeattr(cp);
+	if (vsize) CTF_INSERT(decl->attr, VSIZEP, lj_fls(vsize));
 	break;
 #if LJ_TARGET_X86
-      case H_(5ad22db8,c689b848): case H_(439150fa,65ea78cb):  /* regparm */
+      STR_CASE_("regparm", 'r', 'e') /* regparm */
 	CTF_INSERT(decl->fattr, REGPARM, cp_decl_sizeattr(cp));
 	decl->fattr |= CTFP_CCONV;
 	break;
-      case H_(18fc0b98,7ff4c074): case H_(4e62abed,0a747424):  /* cdecl */
+      STR_CASE_("cdecl", 'c', 'd')  /* cdecl */
 	CTF_INSERT(decl->fattr, CCONV, CTCC_CDECL);
 	decl->fattr |= CTFP_CCONV;
 	break;
-      case H_(72b2e41b,494c5a44): case H_(f2356d59,f25fc9bd):  /* thiscall */
+      STR_CASE_("thiscall", 't', 'h')  /* thiscall */
 	CTF_INSERT(decl->fattr, CCONV, CTCC_THISCALL);
 	decl->fattr |= CTFP_CCONV;
 	break;
-      case H_(0d0ffc42,ab746f88): case H_(21c54ba1,7f0ca7e3):  /* fastcall */
+      STR_CASE_("fastcall", 'f', 'a')  /* fastcall */
 	CTF_INSERT(decl->fattr, CCONV, CTCC_FASTCALL);
 	decl->fattr |= CTFP_CCONV;
 	break;
-      case H_(ef76b040,9412e06a): case H_(de56697b,c750e6e1):  /* stdcall */
+      STR_CASE_("stdcall", 's', 't')  /* stdcall */
 	CTF_INSERT(decl->fattr, CCONV, CTCC_STDCALL);
 	decl->fattr |= CTFP_CCONV;
 	break;
-      case H_(ea78b622,f234bd8e): case H_(252ffb06,8d50f34b):  /* sseregparm */
+      STR_CASE_("sseregparm", 's', 's') /* sseregparm */
 	decl->fattr |= CTF_SSEREGPARM;
 	decl->fattr |= CTFP_CCONV;
 	break;
 #endif
       default:  /* Skip all other attributes. */
 	goto skip_attr;
+#undef STR_CASE_
       }
     } else if (cp->tok >= CTOK_FIRSTDECL) {  /* For __attribute((const)) etc. */
       cp_next(cp);
@@ -1128,11 +1129,10 @@ static void cp_decl_msvcattribute(CPState *cp, CPDecl *decl)
   while (cp->tok == CTOK_IDENT) {
     GCstr *attrstr = cp->str;
     cp_next(cp);
-    switch (attrstr->hash) {
-    case H_(bc2395fa,98f267f8):  /* align */
+    if (!lj_str_equ(attrstr, "align", 5)) {
       cp_decl_align(cp, decl);
-      break;
-    default:  /* Ignore all other attributes. */
+    } else {
+      /* Ignore all other attributes. */
       if (cp_opt(cp, '(')) {
 	while (cp->tok != ')' && cp->tok != CTOK_EOF) cp_next(cp);
 	cp_check(cp, ')');
@@ -1718,16 +1718,16 @@ static void cp_pragma(CPState *cp, BCLine pragmaline)
 {
   cp_next(cp);
   if (cp->tok == CTOK_IDENT &&
-      cp->str->hash == H_(e79b999f,42ca3e85))  {  /* pack */
+      !lj_str_equ(cp->str, "pack", 4))  {  /* pack */
     cp_next(cp);
     cp_check(cp, '(');
     if (cp->tok == CTOK_IDENT) {
-      if (cp->str->hash == H_(738e923c,a1b65954)) {  /* push */
+      if (!lj_str_equ(cp->str, "push", 4)) {  /* push */
 	if (cp->curpack < CPARSE_MAX_PACKSTACK) {
 	  cp->packstack[cp->curpack+1] = cp->packstack[cp->curpack];
 	  cp->curpack++;
 	}
-      } else if (cp->str->hash == H_(6c71cf27,6c71cf27)) {  /* pop */
+      } else if (!lj_str_equ(cp->str, "pop", 3)) {  /* pop */
 	if (cp->curpack > 0) cp->curpack--;
       } else {
 	cp_errmsg(cp, cp->tok, LJ_ERR_XSYMBOL);
@@ -1777,12 +1777,12 @@ static void cp_decl_multi(CPState *cp)
 	cp_line(cp, hashline);
 	continue;
       } else if (tok == CTOK_IDENT &&
-		 cp->str->hash == H_(187aab88,fcb60b42)) { /* line */
+		 lj_str_equ(cp->str, "line", 4) == 0) { /* line */
 	if (cp_next(cp) != CTOK_INTEGER) cp_err_token(cp, tok);
 	cp_line(cp, hashline);
 	continue;
       } else if (tok == CTOK_IDENT &&
-	  cp->str->hash == H_(f5e6b4f8,1d509107)) { /* pragma */
+	  lj_str_equ(cp->str, "pragma", 6) == 0) { /* pragma */
 	cp_pragma(cp, hashline);
 	continue;
       } else {
@@ -1853,6 +1853,7 @@ static void cp_decl_single(CPState *cp)
   if (cp->tok != CTOK_EOF) cp_err_token(cp, CTOK_EOF);
 }
 
+#undef HASH_
 #undef H_
 
 /* ------------------------------------------------------------------------ */
diff --git a/src/lj_str.c b/src/lj_str.c
index dc965bf7d..69cc5f3ae 100644
--- a/src/lj_str.c
+++ b/src/lj_str.c
@@ -68,6 +68,18 @@ static LJ_AINLINE int str_fastcmp(const char *a, const char *b, MSize len)
   return 0;
 }
 
+int32_t LJ_FASTCALL lj_str_equ(GCstr *a, const char *b, MSize b_len)
+{
+  if (a->len != b_len) {
+    return 1;
+  }
+
+  /* Do *NOT* transpose the 1st and 2nd argument, as the 2nd argument must be
+   * aligned at least at 4-byte boundary.
+   */
+  return str_fastcmp(b, strdata(a), b_len);
+}
+
 /* Find fixed string p inside string s. */
 const char *lj_str_find(const char *s, const char *p, MSize slen, MSize plen)
 {
diff --git a/src/lj_str.h b/src/lj_str.h
index 85c1e405b..9a4ea251d 100644
--- a/src/lj_str.h
+++ b/src/lj_str.h
@@ -12,6 +12,8 @@
 
 /* String helpers. */
 LJ_FUNC int32_t LJ_FASTCALL lj_str_cmp(GCstr *a, GCstr *b);
+LJ_FUNC int32_t LJ_FASTCALL lj_str_equ(GCstr *a, const char *b, MSize b_len);
+
 LJ_FUNC const char *lj_str_find(const char *s, const char *f,
 				MSize slen, MSize flen);
 LJ_FUNC int lj_str_haspattern(GCstr *s);
diff --git a/src/x64/test/Makefile b/src/x64/test/Makefile
index 4326ab3db..3ec44eae8 100644
--- a/src/x64/test/Makefile
+++ b/src/x64/test/Makefile
@@ -24,6 +24,7 @@ CXXFLAGS := -O3 -MD -g -msse4.2 -Wall -I../src -I../../../src
 test: $(TEST_PROGRAM)
 	@echo "some unit test"
 	$(VALGRIND) ./$(TEST_PROGRAM)
+	./unit_test.sh
 
 	@echo "smoke test"
 	../../luajit test_str_comp.lua
diff --git a/src/x64/test/unit/ffi/test_abi.lua b/src/x64/test/unit/ffi/test_abi.lua
new file mode 100644
index 000000000..9fafcf55d
--- /dev/null
+++ b/src/x64/test/unit/ffi/test_abi.lua
@@ -0,0 +1,10 @@
+local ffi = require "ffi"
+
+-- TODO: test "gc64" and "win" parameters
+assert((ffi.abi("32bit") or ffi.abi("64bit"))
+        and ffi.abi("le")
+        and not ffi.abi("be")
+        and ffi.abi("fpu")
+        and not ffi.abi("softfp")
+        and ffi.abi("hardfp")
+        and not ffi.abi("eabi"))
diff --git a/src/x64/test/unit/ffi/test_line_directive.lua b/src/x64/test/unit/ffi/test_line_directive.lua
new file mode 100644
index 000000000..a8b0403cb
--- /dev/null
+++ b/src/x64/test/unit/ffi/test_line_directive.lua
@@ -0,0 +1,15 @@
+local x = [=[
+local ffi = require "ffi"
+
+ffi.cdef [[
+    #line 100
+    typedef Int xxx
+]]
+]=]
+
+local function foo()
+    loadstring(x)()
+end
+
+local r, e = pcall(foo)
+assert(string.find(e, "declaration specifier expected near 'Int' at line 100") ~= nil)
diff --git a/src/x64/test/unit/ffi/test_pragma_pack_pushpop.lua b/src/x64/test/unit/ffi/test_pragma_pack_pushpop.lua
new file mode 100644
index 000000000..5f1bdd30b
--- /dev/null
+++ b/src/x64/test/unit/ffi/test_pragma_pack_pushpop.lua
@@ -0,0 +1,12 @@
+local ffi = require "ffi"
+
+ffi.cdef[[
+#pragma pack(push, 1)
+typedef struct {
+    char x;
+    double y;
+} foo;
+#pragma pack(pop)
+]]
+
+assert(ffi.sizeof("foo") == 9)
diff --git a/src/x64/test/unit/ffi/test_var_attribute.lua b/src/x64/test/unit/ffi/test_var_attribute.lua
new file mode 100644
index 000000000..0b4d437a0
--- /dev/null
+++ b/src/x64/test/unit/ffi/test_var_attribute.lua
@@ -0,0 +1,13 @@
+local ffi = require "ffi"
+
+ffi.cdef[[
+typedef struct { int a; char b; } __attribute__((packed)) myty1;
+typedef struct { int a; char b; } __attribute__((aligned(16))) myty2;
+typedef int __attribute__ ((vector_size (32))) myty3;
+typedef int __attribute__ ((mode(DI))) myty4;
+]]
+
+assert(ffi.sizeof("myty1") == 5 and
+       ffi.alignof("myty2") == 16 and
+       ffi.sizeof("myty3") == 32 and
+       ffi.sizeof("myty4") == 8)
diff --git a/src/x64/test/unit_test.sh b/src/x64/test/unit_test.sh
new file mode 100755
index 000000000..c6633ca2e
--- /dev/null
+++ b/src/x64/test/unit_test.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+DIR=$(cd $(dirname $0); pwd)
+cd $DIR
+
+LUAJIT=$DIR/../../luajit
+HASERR=0
+
+find $DIR/unit -name "*.lua" -print | while read x; do
+    $LUAJIT $x >/dev/null 2>/dev/null
+    if [ $? -eq 0 ]; then
+        echo "$x ok"
+    else
+        HASERR=1
+        echo "$x failed"
+    fi
+done
+
+if [ $HASERR -eq 0 ]; then
+    exit 0
+fi
+
+exit 1