diff --git a/tcg/arm/tcg-target.h b/tcg/arm/tcg-target.h
index ba0d854aa5725256bda4aebf3782810d720b5926..6d58de81b0bfd2bbb178048fab52d6045a9e2bbf 100644
--- a/tcg/arm/tcg-target.h
+++ b/tcg/arm/tcg-target.h
@@ -69,6 +69,7 @@ enum {
 // #define TCG_TARGET_HAS_orc_i32
 // #define TCG_TARGET_HAS_eqv_i32
 // #define TCG_TARGET_HAS_nand_i32
+// #define TCG_TARGET_HAS_nor_i32
 
 #define TCG_TARGET_HAS_GUEST_BASE
 
diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h
index 7a2bdeb63aea683bf704cee4a6d11f71f7af7047..ca1d7306eaad3184ca237cd39c4c7f5fd50533b8 100644
--- a/tcg/i386/tcg-target.h
+++ b/tcg/i386/tcg-target.h
@@ -59,6 +59,7 @@ enum {
 // #define TCG_TARGET_HAS_orc_i32
 // #define TCG_TARGET_HAS_eqv_i32
 // #define TCG_TARGET_HAS_nand_i32
+// #define TCG_TARGET_HAS_nor_i32
 
 #define TCG_TARGET_HAS_GUEST_BASE
 
diff --git a/tcg/mips/tcg-target.h b/tcg/mips/tcg-target.h
index 7af2e702812f43db728fb0431a52b2e6c696e852..63d7f9a500bed3e82389819376e7ae81a78e1e49 100644
--- a/tcg/mips/tcg-target.h
+++ b/tcg/mips/tcg-target.h
@@ -89,6 +89,7 @@ enum {
 #undef TCG_TARGET_HAS_orc_i32
 #undef TCG_TARGET_HAS_eqv_i32
 #undef TCG_TARGET_HAS_nand_i32
+#undef TCG_TARGET_HAS_nor_i32
 
 /* optional instructions automatically implemented */
 #undef TCG_TARGET_HAS_neg_i32      /* sub  rd, zero, rt   */
diff --git a/tcg/ppc/tcg-target.h b/tcg/ppc/tcg-target.h
index 1daa93d78c13d536fe92742bd57222110304ab84..2eeef3b154b38f962ee4f4cb47c2fcd1fadf10f6 100644
--- a/tcg/ppc/tcg-target.h
+++ b/tcg/ppc/tcg-target.h
@@ -91,6 +91,7 @@ enum {
 #define TCG_TARGET_HAS_orc_i32
 /* #define TCG_TARGET_HAS_eqv_i32 */
 /* #define TCG_TARGET_HAS_nand_i32 */
+/* #define TCG_TARGET_HAS_nor_i32 */
 
 #define TCG_AREG0 TCG_REG_R27
 
diff --git a/tcg/ppc64/tcg-target.h b/tcg/ppc64/tcg-target.h
index 8ddbd2fb2bfed45e1c692474cbcd2d4faf5b415a..eefdeb255ce27b3c2c0a8bbfa8c03df385600fc7 100644
--- a/tcg/ppc64/tcg-target.h
+++ b/tcg/ppc64/tcg-target.h
@@ -82,6 +82,7 @@ enum {
 /* #define TCG_TARGET_HAS_orc_i32 */
 /* #define TCG_TARGET_HAS_eqv_i32 */
 /* #define TCG_TARGET_HAS_nand_i32 */
+/* #define TCG_TARGET_HAS_nor_i32 */
 
 #define TCG_TARGET_HAS_div_i64
 /* #define TCG_TARGET_HAS_rot_i64 */
@@ -100,6 +101,7 @@ enum {
 /* #define TCG_TARGET_HAS_orc_i64 */
 /* #define TCG_TARGET_HAS_eqv_i64 */
 /* #define TCG_TARGET_HAS_nand_i64 */
+/* #define TCG_TARGET_HAS_nor_i64 */
 
 #define TCG_AREG0 TCG_REG_R27
 
diff --git a/tcg/s390/tcg-target.h b/tcg/s390/tcg-target.h
index b96ce19fd149f3fed726914810ebae799cef5a0b..d8a29558bbe4a93ebb97317010d0c2e6a714ccec 100644
--- a/tcg/s390/tcg-target.h
+++ b/tcg/s390/tcg-target.h
@@ -61,6 +61,7 @@ enum {
 // #define TCG_TARGET_HAS_orc_i32
 // #define TCG_TARGET_HAS_eqv_i32
 // #define TCG_TARGET_HAS_nand_i32
+// #define TCG_TARGET_HAS_nor_i32
 
 // #define TCG_TARGET_HAS_div_i64
 // #define TCG_TARGET_HAS_rot_i64
@@ -79,6 +80,7 @@ enum {
 // #define TCG_TARGET_HAS_orc_i64
 // #define TCG_TARGET_HAS_eqv_i64
 // #define TCG_TARGET_HAS_nand_i64
+// #define TCG_TARGET_HAS_nor_i64
 
 /* used for function call generation */
 #define TCG_REG_CALL_STACK		TCG_REG_R15
diff --git a/tcg/sparc/tcg-target.h b/tcg/sparc/tcg-target.h
index c7d0b6a103f694682ac1d218651a4e043676ffd2..6296b54818fae14dd07c63873c25d1fd368eaf0d 100644
--- a/tcg/sparc/tcg-target.h
+++ b/tcg/sparc/tcg-target.h
@@ -102,6 +102,7 @@ enum {
 #define TCG_TARGET_HAS_orc_i32
 // #define TCG_TARGET_HAS_eqv_i32
 // #define TCG_TARGET_HAS_nand_i32
+// #define TCG_TARGET_HAS_nor_i32
 
 #if TCG_TARGET_REG_BITS == 64
 #define TCG_TARGET_HAS_div_i64
@@ -121,6 +122,7 @@ enum {
 #define TCG_TARGET_HAS_orc_i64
 // #define TCG_TARGET_HAS_eqv_i64
 // #define TCG_TARGET_HAS_nand_i64
+// #define TCG_TARGET_HAS_nor_i64
 #endif
 
 /* Note: must be synced with dyngen-exec.h */
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index d028f7f4e4af4644f7b36af144e5ea43ff571056..f7d11b0633dd836680e3bb57a295d8297428fabd 100644
--- a/tcg/tcg-op.h
+++ b/tcg/tcg-op.h
@@ -1786,14 +1786,25 @@ static inline void tcg_gen_nand_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2)
 
 static inline void tcg_gen_nor_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2)
 {
+#ifdef TCG_TARGET_HAS_nor_i32
+    tcg_gen_op3_i32(INDEX_op_nor_i32, ret, arg1, arg2);
+#else
     tcg_gen_or_i32(ret, arg1, arg2);
     tcg_gen_not_i32(ret, ret);
+#endif
 }
 
 static inline void tcg_gen_nor_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2)
 {
+#ifdef TCG_TARGET_HAS_nor_i64
+    tcg_gen_op3_i64(INDEX_op_nor_i64, ret, arg1, arg2);
+#elif defined(TCG_TARGET_HAS_nor_i32) && TCG_TARGET_REG_BITS == 32
+    tcg_gen_nor_i32(TCGV_LOW(ret), TCGV_LOW(arg1), TCGV_LOW(arg2));
+    tcg_gen_nor_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1), TCGV_HIGH(arg2));
+#else
     tcg_gen_or_i64(ret, arg1, arg2);
     tcg_gen_not_i64(ret, ret);
+#endif
 }
 
 static inline void tcg_gen_orc_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2)
diff --git a/tcg/tcg-opc.h b/tcg/tcg-opc.h
index a20d3d877ab413acbc01e554362c094d7076950e..9797f637e49898dca7f1d24f634649b2f9488923 100644
--- a/tcg/tcg-opc.h
+++ b/tcg/tcg-opc.h
@@ -122,6 +122,9 @@ DEF2(eqv_i32, 1, 2, 0, 0)
 #ifdef TCG_TARGET_HAS_nand_i32
 DEF2(nand_i32, 1, 2, 0, 0)
 #endif
+#ifdef TCG_TARGET_HAS_nor_i32
+DEF2(nor_i32, 1, 2, 0, 0)
+#endif
 
 #if TCG_TARGET_REG_BITS == 64
 DEF2(mov_i64, 1, 1, 0, 0)
@@ -211,6 +214,9 @@ DEF2(eqv_i64, 1, 2, 0, 0)
 #ifdef TCG_TARGET_HAS_nand_i64
 DEF2(nand_i64, 1, 2, 0, 0)
 #endif
+#ifdef TCG_TARGET_HAS_nor_i64
+DEF2(nor_i64, 1, 2, 0, 0)
+#endif
 #endif
 
 /* QEMU specific */
diff --git a/tcg/x86_64/tcg-target.h b/tcg/x86_64/tcg-target.h
index e9905672b4e91decade4e547830aaa8386312b8d..e0eabaa1b492c32db0dbbc2d70f39bf5a230ba52 100644
--- a/tcg/x86_64/tcg-target.h
+++ b/tcg/x86_64/tcg-target.h
@@ -88,6 +88,8 @@ enum {
 // #define TCG_TARGET_HAS_eqv_i64
 // #define TCG_TARGET_HAS_nand_i32
 // #define TCG_TARGET_HAS_nand_i64
+// #define TCG_TARGET_HAS_nor_i32
+// #define TCG_TARGET_HAS_nor_i64
 
 #define TCG_TARGET_HAS_GUEST_BASE