diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 59e7b88..6e6e7b3 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -327,6 +327,10 @@ DEF_HELPER_2(vclzb, void, avr, avr)
 DEF_HELPER_2(vclzh, void, avr, avr)
 DEF_HELPER_2(vclzw, void, avr, avr)
 DEF_HELPER_2(vclzd, void, avr, avr)
+DEF_HELPER_2(vctzb, void, avr, avr)
+DEF_HELPER_2(vctzh, void, avr, avr)
+DEF_HELPER_2(vctzw, void, avr, avr)
+DEF_HELPER_2(vctzd, void, avr, avr)
 DEF_HELPER_2(vpopcntb, void, avr, avr)
 DEF_HELPER_2(vpopcnth, void, avr, avr)
 DEF_HELPER_2(vpopcntw, void, avr, avr)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index d545ec6..09f02f8 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -2090,6 +2090,21 @@ VGENERIC_DO(clzd, u64)
 #undef clzw
 #undef clzd
 
+#define ctzb(v) ((v) ? ctz32((uint32_t)(v)) : 8)
+#define ctzh(v) ((v) ? ctz32((uint32_t)(v)) : 16)
+#define ctzw(v) ctz32((v))
+#define ctzd(v) ctz64((v))
+
+VGENERIC_DO(ctzb, u8)
+VGENERIC_DO(ctzh, u16)
+VGENERIC_DO(ctzw, u32)
+VGENERIC_DO(ctzd, u64)
+
+#undef ctzb
+#undef ctzh
+#undef ctzw
+#undef ctzd
+
 #define popcntb(v) ctpop8(v)
 #define popcnth(v) ctpop16(v)
 #define popcntw(v) ctpop32(v)
diff --git a/target-ppc/translate/vmx-impl.c b/target-ppc/translate/vmx-impl.c
index 8bd48f3..2cf8c8f 100644
--- a/target-ppc/translate/vmx-impl.c
+++ b/target-ppc/translate/vmx-impl.c
@@ -553,6 +553,21 @@ static void glue(gen_, name)(DisasContext *ctx)                         \
         tcg_temp_free_ptr(rd);                                          \
     }
 
+#define GEN_VXFORM_NOA_2(name, opc2, opc3, opc4)                        \
+static void glue(gen_, name)(DisasContext *ctx)                         \
+    {                                                                   \
+        TCGv_ptr rb, rd;                                                \
+        if (unlikely(!ctx->altivec_enabled)) {                          \
+            gen_exception(ctx, POWERPC_EXCP_VPU);                       \
+            return;                                                     \
+        }                                                               \
+        rb = gen_avr_ptr(rB(ctx->opcode));                              \
+        rd = gen_avr_ptr(rD(ctx->opcode));                              \
+        gen_helper_##name(rd, rb);                                      \
+        tcg_temp_free_ptr(rb);                                          \
+        tcg_temp_free_ptr(rd);                                          \
+    }
+
 GEN_VXFORM_NOA(vupkhsb, 7, 8);
 GEN_VXFORM_NOA(vupkhsh, 7, 9);
 GEN_VXFORM_NOA(vupkhsw, 7, 25);
@@ -723,6 +738,10 @@ GEN_VXFORM_NOA(vclzb, 1, 28)
 GEN_VXFORM_NOA(vclzh, 1, 29)
 GEN_VXFORM_NOA(vclzw, 1, 30)
 GEN_VXFORM_NOA(vclzd, 1, 31)
+GEN_VXFORM_NOA_2(vctzb, 1, 24, 28)
+GEN_VXFORM_NOA_2(vctzh, 1, 24, 29)
+GEN_VXFORM_NOA_2(vctzw, 1, 24, 30)
+GEN_VXFORM_NOA_2(vctzd, 1, 24, 31)
 GEN_VXFORM_NOA(vpopcntb, 1, 28)
 GEN_VXFORM_NOA(vpopcnth, 1, 29)
 GEN_VXFORM_NOA(vpopcntw, 1, 30)
diff --git a/target-ppc/translate/vmx-ops.c b/target-ppc/translate/vmx-ops.c
index f0e2da2..47e51ef 100644
--- a/target-ppc/translate/vmx-ops.c
+++ b/target-ppc/translate/vmx-ops.c
@@ -44,6 +44,10 @@ GEN_HANDLER_E(name, 0x04, opc2, opc3, 0x00000000, PPC_NONE, PPC2_ISA300)
 #define GEN_VXFORM_300_EXT(name, opc2, opc3, inval)                     \
 GEN_HANDLER_E(name, 0x04, opc2, opc3, inval, PPC_NONE, PPC2_ISA300)
 
+#define GEN_VXFORM_300_EXT1(name, opc2, opc3, opc4)                     \
+GEN_HANDLER_E_2(name, 0x04, opc2, opc3, opc4, 0x00000000, PPC_NONE,     \
+                                                       PPC2_ISA300)
+
 #define GEN_VXFORM_DUAL(name0, name1, opc2, opc3, type0, type1) \
 GEN_HANDLER_E(name0##_##name1, 0x4, opc2, opc3, 0x00000000, type0, type1)
 
@@ -212,6 +216,10 @@ GEN_VXFORM_DUAL1(vspltish, vinserth, 6, 13, 0x00000000, 0x100000,
 GEN_VXFORM_DUAL1(vspltisw, vinsertw, 6, 14, 0x00000000, 0x100000,
                                                PPC2_ALTIVEC_207),
 GEN_VXFORM_300_EXT(vinsertd, 6, 15, 0x100000),
+GEN_VXFORM_300_EXT1(vctzb, 0x01, 0x18, 0x1C),
+GEN_VXFORM_300_EXT1(vctzh, 0x01, 0x18, 0x1D),
+GEN_VXFORM_300_EXT1(vctzw, 0x01, 0x18, 0x1E),
+GEN_VXFORM_300_EXT1(vctzd, 0x01, 0x18, 0x1F),
 
 #define GEN_VXFORM_NOA(name, opc2, opc3)                                \
     GEN_HANDLER(name, 0x04, opc2, opc3, 0x001f0000, PPC_ALTIVEC)
