diff --git a/tcg/arm/tcg-target.h b/tcg/arm/tcg-target.h
index 0e8e1cc..c7bcc7f 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 8e7ed11..d4fc348 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 179151c..b65e085 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 1087c00..a3c7093 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
 #define TCG_AREG1 TCG_REG_R24
diff --git a/tcg/ppc64/tcg-target.h b/tcg/ppc64/tcg-target.h
index acd1f57..4bf676b 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
 #define TCG_AREG1 TCG_REG_R24
diff --git a/tcg/s390/tcg-target.h b/tcg/s390/tcg-target.h
index b0d2866..6fa4231 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 b0b6c94..a4d1f36 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 and Makefile.target */
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index 7bd498d..bafac2b 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 37ff0eb..5643d5d 100644
--- a/tcg/tcg-opc.h
+++ b/tcg/tcg-opc.h
@@ -120,6 +120,9 @@ 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)
@@ -208,6 +211,9 @@ 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 119b50a..223e667 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
 
