diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index e739c5b94ab1924f65a262e15342a748e2a4dc40..af6550eeb95db17f444acc7e6bfdb73e3dc14f3c 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -14157,6 +14157,10 @@ do_t_loloop (void)
 #define M_MNEM_vaddlva	0xee890f20
 #define M_MNEM_vaddv	0xeef10f00
 #define M_MNEM_vaddva	0xeef10f20
+#define M_MNEM_vddup	0xee011f6e
+#define M_MNEM_vdwdup	0xee011f60
+#define M_MNEM_vidup	0xee010f6e
+#define M_MNEM_viwdup	0xee010f60
 
 /* Neon instruction encoder helpers.  */
 
@@ -14321,8 +14325,10 @@ NEON_ENC_TAB
      - a table used to drive neon_select_shape.  */
 
 #define NEON_SHAPE_DEF			\
+  X(4, (Q, R, R, I), QUAD),		\
   X(4, (R, R, S, S), QUAD),		\
   X(4, (S, S, R, R), QUAD),		\
+  X(3, (Q, R, I), QUAD),		\
   X(3, (I, Q, Q), QUAD),		\
   X(3, (I, Q, R), QUAD),		\
   X(3, (R, Q, Q), QUAD),		\
@@ -15608,6 +15614,49 @@ do_mve_vfmas (void)
   inst.is_neon = 1;
 }
 
+static void
+do_mve_viddup (void)
+{
+  if (inst.cond > COND_ALWAYS)
+    inst.pred_insn_type = INSIDE_VPT_INSN;
+  else
+    inst.pred_insn_type = MVE_OUTSIDE_PRED_INSN;
+
+  unsigned imm = inst.relocs[0].exp.X_add_number;
+  constraint (imm != 1 && imm != 2 && imm != 4 && imm != 8,
+	      _("immediate must be either 1, 2, 4 or 8"));
+
+  enum neon_shape rs;
+  struct neon_type_el et;
+  unsigned Rm;
+  if (inst.instruction == M_MNEM_vddup || inst.instruction == M_MNEM_vidup)
+    {
+      rs = neon_select_shape (NS_QRI, NS_NULL);
+      et = neon_check_type (2, rs, N_KEY | N_U8 | N_U16 | N_U32, N_EQK);
+      Rm = 7;
+    }
+  else
+    {
+      constraint ((inst.operands[2].reg % 2) != 1, BAD_EVEN);
+      if (inst.operands[2].reg == REG_SP)
+	as_tsktsk (MVE_BAD_SP);
+      else if (inst.operands[2].reg == REG_PC)
+	first_error (BAD_PC);
+
+      rs = neon_select_shape (NS_QRRI, NS_NULL);
+      et = neon_check_type (3, rs, N_KEY | N_U8 | N_U16 | N_U32, N_EQK, N_EQK);
+      Rm = inst.operands[2].reg >> 1;
+    }
+  inst.instruction |= HI1 (inst.operands[0].reg) << 22;
+  inst.instruction |= neon_logbits (et.size) << 20;
+  inst.instruction |= inst.operands[1].reg << 16;
+  inst.instruction |= LOW4 (inst.operands[0].reg) << 12;
+  inst.instruction |= (imm > 2) << 7;
+  inst.instruction |= Rm << 1;
+  inst.instruction |= (imm == 2 || imm == 8);
+  inst.is_neon = 1;
+}
+
 static void
 do_mve_vcmul (void)
 {
@@ -18407,6 +18456,8 @@ do_neon_dup (void)
 {
   if (inst.operands[1].isscalar)
     {
+      constraint (!ARM_CPU_HAS_FEATURE (cpu_variant, fpu_neon_ext_v1),
+		  BAD_FPU);
       enum neon_shape rs = neon_select_shape (NS_DS, NS_QS, NS_NULL);
       struct neon_type_el et = neon_check_type (2, rs,
 	N_EQK, N_8 | N_16 | N_32 | N_KEY);
@@ -18434,6 +18485,23 @@ do_neon_dup (void)
       enum neon_shape rs = neon_select_shape (NS_DR, NS_QR, NS_NULL);
       struct neon_type_el et = neon_check_type (2, rs,
 	N_8 | N_16 | N_32 | N_KEY, N_EQK);
+      if (rs == NS_QR)
+	{
+	  if (check_simd_pred_availability (0, NEON_CHECK_ARCH))
+	    return;
+	}
+      else
+	constraint (!ARM_CPU_HAS_FEATURE (cpu_variant, fpu_neon_ext_v1),
+		    BAD_FPU);
+
+      if (ARM_CPU_HAS_FEATURE (cpu_variant, mve_ext))
+	{
+	  if (inst.operands[1].reg == REG_SP)
+	    as_tsktsk (MVE_BAD_SP);
+	  else if (inst.operands[1].reg == REG_PC)
+	    as_tsktsk (MVE_BAD_PC);
+	}
+
       /* Duplicate ARM register to lanes of vector.  */
       NEON_ENCODE (ARMREG, inst);
       switch (et.size)
@@ -23659,7 +23727,6 @@ static const struct asm_opcode insns[] =
  NUF(vrev16,    1b00100, 2, (RNDQ, RNDQ),     neon_rev),
  NUF(vrev16q,   1b00100, 2, (RNQ,  RNQ),      neon_rev),
   /* Vector replicate. Sizes 8 16 32.  */
- nCE(vdup,      _vdup,    2, (RNDQ, RR_RNSC),  neon_dup),
  nCE(vdupq,     _vdup,    2, (RNQ,  RR_RNSC),  neon_dup),
   /* VMOVL. Types S8 S16 S32 U8 U16 U32.  */
  NUF(vmovl,     0800a10, 2, (RNQ, RND),       neon_movl),
@@ -24221,6 +24288,10 @@ static const struct asm_opcode insns[] =
  mCEF(vaddlva,	_vaddlva,   3, (RRe, RRo, RMQ),			  mve_vaddlv),
  mCEF(vaddv,	_vaddv,	    2, (RRe, RMQ),			  mve_vaddv),
  mCEF(vaddva,	_vaddva,    2, (RRe, RMQ),			  mve_vaddv),
+ mCEF(vddup,	_vddup,	    3, (RMQ, RRe, EXPi),		  mve_viddup),
+ mCEF(vdwdup,	_vdwdup,    4, (RMQ, RRe, RR, EXPi),		  mve_viddup),
+ mCEF(vidup,	_vidup,	    3, (RMQ, RRe, EXPi),		  mve_viddup),
+ mCEF(viwdup,	_viwdup,    4, (RMQ, RRe, RR, EXPi),		  mve_viddup),
 
 #undef THUMB_VARIANT
 #define THUMB_VARIANT & mve_fp_ext
@@ -24283,6 +24354,7 @@ static const struct asm_opcode insns[] =
  mnUF(veor,      _veor,		  3, (RNDQMQ, oRNDQMQ, RNDQMQ),      neon_logic),
  MNUF(vcls,      1b00400,	  2, (RNDQMQ, RNDQMQ),		     neon_cls),
  MNUF(vclz,      1b00480,	  2, (RNDQMQ, RNDQMQ),		     neon_clz),
+ mnCE(vdup,      _vdup,		  2, (RNDQMQ, RR_RNSC),		     neon_dup),
 
 #undef	ARM_VARIANT
 #define ARM_VARIANT & arm_ext_v8_3
diff --git a/gas/testsuite/gas/arm/mve-vddup-bad.d b/gas/testsuite/gas/arm/mve-vddup-bad.d
new file mode 100644
index 0000000000000000000000000000000000000000..a6522dc25423352b027d58a0b0f495f7f0705245
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vddup-bad.d
@@ -0,0 +1,6 @@
+#name: bad MVE VDDUP and VDWDUP instructions
+#as: -march=armv8.1-m.main+mve
+#error_output: mve-vddup-bad.l
+
+.*: +file format .*arm.*
+
diff --git a/gas/testsuite/gas/arm/mve-vddup-bad.l b/gas/testsuite/gas/arm/mve-vddup-bad.l
new file mode 100644
index 0000000000000000000000000000000000000000..92ff9657446829f1f703d99be34384d21307e3a9
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vddup-bad.l
@@ -0,0 +1,33 @@
+[^:]*: Assembler messages:
+[^:]*:16: Error: bad type in SIMD instruction -- `vddup.s16 q0,r0,#1'
+[^:]*:17: Error: bad type in SIMD instruction -- `vddup.u64 q0,r0,#1'
+[^:]*:18: Error: immediate must be either 1, 2, 4 or 8 -- `vddup.u32 q0,r0,#3'
+[^:]*:19: Error: immediate must be either 1, 2, 4 or 8 -- `vddup.u32 q0,r0,#0'
+[^:]*:20: Error: bad type in SIMD instruction -- `vdwdup.s16 q0,r0,r1,#1'
+[^:]*:21: Error: bad type in SIMD instruction -- `vdwdup.u64 q0,r0,r1,#1'
+[^:]*:22: Error: immediate must be either 1, 2, 4 or 8 -- `vdwdup.u32 q0,r0,r1,#3'
+[^:]*:23: Error: immediate must be either 1, 2, 4 or 8 -- `vdwdup.u32 q0,r0,r1,#0'
+[^:]*:24: Warning: instruction is UNPREDICTABLE with SP operand
+[^:]*:25: Error: r15 not allowed here -- `vdwdup.u32 q0,r0,pc,#1'
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:29: Error: syntax error -- `vddupeq.u32 q0,r0,#1'
+[^:]*:30: Error: syntax error -- `vddupeq.u32 q0,r0,#1'
+[^:]*:32: Error: syntax error -- `vddupeq.u32 q0,r0,#1'
+[^:]*:33: Error: vector predicated instruction should be in VPT/VPST block -- `vddupt.u32 q0,r0,#1'
+[^:]*:35: Error: instruction missing MVE vector predication code -- `vddup.u32 q0,r0,#1'
+[^:]*:37: Error: syntax error -- `vdwdupeq.u32 q0,r0,r1,#1'
+[^:]*:38: Error: syntax error -- `vdwdupeq.u32 q0,r0,r1,#1'
+[^:]*:40: Error: syntax error -- `vdwdupeq.u32 q0,r0,r1,#1'
+[^:]*:41: Error: vector predicated instruction should be in VPT/VPST block -- `vdwdupt.u32 q0,r0,r1,#1'
+[^:]*:43: Error: instruction missing MVE vector predication code -- `vdwdup.u32 q0,r0,r1,#1'
diff --git a/gas/testsuite/gas/arm/mve-vddup-bad.s b/gas/testsuite/gas/arm/mve-vddup-bad.s
new file mode 100644
index 0000000000000000000000000000000000000000..9951e9d11843d3302823e7805bbbe20abc79d3eb
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vddup-bad.s
@@ -0,0 +1,43 @@
+.macro cond1
+.irp cond, eq, ne, gt, ge, lt, le
+it \cond
+vddup.u32 q0, r2, #1
+.endr
+.endm
+
+.macro cond2
+.irp cond, eq, ne, gt, ge, lt, le
+it \cond
+vdwdup.u32 q0, r2, r1, #1
+.endr
+.endm
+.syntax unified
+.thumb
+vddup.s16 q0, r0, #1
+vddup.u64 q0, r0, #1
+vddup.u32 q0, r0, #3
+vddup.u32 q0, r0, #0
+vdwdup.s16 q0, r0, r1, #1
+vdwdup.u64 q0, r0, r1, #1
+vdwdup.u32 q0, r0, r1, #3
+vdwdup.u32 q0, r0, r1, #0
+vdwdup.u32 q0, r0, sp, #1
+vdwdup.u32 q0, r0, pc, #1
+cond1
+cond2
+it eq
+vddupeq.u32 q0, r0, #1
+vddupeq.u32 q0, r0, #1
+vpst
+vddupeq.u32 q0, r0, #1
+vddupt.u32 q0, r0, #1
+vpst
+vddup.u32 q0, r0, #1
+it eq
+vdwdupeq.u32 q0, r0, r1, #1
+vdwdupeq.u32 q0, r0, r1, #1
+vpst
+vdwdupeq.u32 q0, r0, r1, #1
+vdwdupt.u32 q0, r0, r1, #1
+vpst
+vdwdup.u32 q0, r0, r1, #1
diff --git a/gas/testsuite/gas/arm/mve-vdup-bad.d b/gas/testsuite/gas/arm/mve-vdup-bad.d
new file mode 100644
index 0000000000000000000000000000000000000000..2ad95976135bb46535720195d17b0024cf391abc
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vdup-bad.d
@@ -0,0 +1,5 @@
+#name: bad MVE VDUP instructions
+#as: -march=armv8.1-m.main+mve
+#error_output: mve-vdup-bad.l
+
+.*: +file format .*arm.*
diff --git a/gas/testsuite/gas/arm/mve-vdup-bad.l b/gas/testsuite/gas/arm/mve-vdup-bad.l
new file mode 100644
index 0000000000000000000000000000000000000000..08808393569f7e7a839680b001e38e9f1ca66886
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vdup-bad.l
@@ -0,0 +1,16 @@
+[^:]*: Assembler messages:
+[^:]*:11: Error: bad type in SIMD instruction -- `vdup.64 q0,r1'
+[^:]*:12: Error: selected FPU does not support instruction -- `vdup.32 q0,d0\[1\]'
+[^:]*:13: Warning: instruction is UNPREDICTABLE with SP operand
+[^:]*:14: Warning: instruction is UNPREDICTABLE with PC operand
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:15: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:17: Error: syntax error -- `vdupeq.32 q0,r2'
+[^:]*:18: Error: syntax error -- `vdupeq.32 q0,r2'
+[^:]*:20: Error: syntax error -- `vdupeq.32 q0,r2'
+[^:]*:21: Error: incorrect condition in VPT/VPST block -- `vdupt.32 q0,r2'
+[^:]*:23: Error: instruction missing MVE vector predication code -- `vdup.32 q0,r2'
diff --git a/gas/testsuite/gas/arm/mve-vdup-bad.s b/gas/testsuite/gas/arm/mve-vdup-bad.s
new file mode 100644
index 0000000000000000000000000000000000000000..c6539d860575184fcf6745d165995edf80270f6e
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vdup-bad.s
@@ -0,0 +1,23 @@
+.macro cond
+.irp cond, eq, ne, gt, ge, lt, le
+it \cond
+vdup.32 q0, r2
+.endr
+.endm
+
+.syntax unified
+.thumb
+vdup.f16 q0, r1
+vdup.64 q0, r1
+vdup.32 q0, d0[1]
+vdup.32 q0, sp
+vdup.32 q0, pc
+cond
+it eq
+vdupeq.32 q0, r2
+vdupeq.32 q0, r2
+vpste
+vdupeq.32 q0, r2
+vdupt.32 q0, r2
+vpst
+vdup.32 q0, r2
diff --git a/gas/testsuite/gas/arm/mve-vidup-bad.d b/gas/testsuite/gas/arm/mve-vidup-bad.d
new file mode 100644
index 0000000000000000000000000000000000000000..6a9a0384048c05c0f962130078755c6dd983e962
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vidup-bad.d
@@ -0,0 +1,5 @@
+#name: bad MVE VIDUP and VIWDUP instructions
+#as: -march=armv8.1-m.main+mve
+#error_output: mve-vidup-bad.l
+
+.*: +file format .*arm.*
diff --git a/gas/testsuite/gas/arm/mve-vidup-bad.l b/gas/testsuite/gas/arm/mve-vidup-bad.l
new file mode 100644
index 0000000000000000000000000000000000000000..5fb742559f5bd1573aa03ea767a56112a5acb9f0
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vidup-bad.l
@@ -0,0 +1,34 @@
+[^:]*: Assembler messages:
+[^:]*:16: Error: bad type in SIMD instruction -- `vidup.s16 q0,r0,#1'
+[^:]*:17: Error: bad type in SIMD instruction -- `vidup.u64 q0,r0,#1'
+[^:]*:18: Error: immediate must be either 1, 2, 4 or 8 -- `vidup.u32 q0,r0,#3'
+[^:]*:19: Error: immediate must be either 1, 2, 4 or 8 -- `vidup.u32 q0,r0,#0'
+[^:]*:20: Error: bad type in SIMD instruction -- `viwdup.s16 q0,r0,r1,#1'
+[^:]*:21: Error: bad type in SIMD instruction -- `viwdup.u64 q0,r0,r1,#1'
+[^:]*:22: Error: immediate must be either 1, 2, 4 or 8 -- `viwdup.u32 q0,r0,r1,#3'
+[^:]*:23: Error: immediate must be either 1, 2, 4 or 8 -- `viwdup.u32 q0,r0,r1,#0'
+[^:]*:24: Warning: instruction is UNPREDICTABLE with SP operand
+[^:]*:25: Error: r15 not allowed here -- `viwdup.u32 q0,r0,pc,#1'
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:26: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:27: Warning: instruction is UNPREDICTABLE in an IT block
+[^:]*:29: Error: syntax error -- `vidupeq.u32 q0,r0,#1'
+[^:]*:30: Error: syntax error -- `vidupeq.u32 q0,r0,#1'
+[^:]*:32: Error: syntax error -- `vidupeq.u32 q0,r0,#1'
+[^:]*:33: Error: vector predicated instruction should be in VPT/VPST block -- `vidupt.u32 q0,r0,#1'
+[^:]*:35: Error: instruction missing MVE vector predication code -- `vidup.u32 q0,r0,#1'
+[^:]*:37: Error: syntax error -- `viwdupeq.u32 q0,r0,r1,#1'
+[^:]*:38: Error: syntax error -- `viwdupeq.u32 q0,r0,r1,#1'
+[^:]*:40: Error: syntax error -- `viwdupeq.u32 q0,r0,r1,#1'
+[^:]*:41: Error: vector predicated instruction should be in VPT/VPST block -- `viwdupt.u32 q0,r0,r1,#1'
+[^:]*:43: Error: instruction missing MVE vector predication code -- `viwdup.u32 q0,r0,r1,#1'
+
diff --git a/gas/testsuite/gas/arm/mve-vidup-bad.s b/gas/testsuite/gas/arm/mve-vidup-bad.s
new file mode 100644
index 0000000000000000000000000000000000000000..3d3a4488d9c780123754a3243241720a513f4d3c
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-vidup-bad.s
@@ -0,0 +1,43 @@
+.macro cond1
+.irp cond, eq, ne, gt, ge, lt, le
+it \cond
+vidup.u32 q0, r2, #1
+.endr
+.endm
+
+.macro cond2
+.irp cond, eq, ne, gt, ge, lt, le
+it \cond
+viwdup.u32 q0, r2, r1, #1
+.endr
+.endm
+.syntax unified
+.thumb
+vidup.s16 q0, r0, #1
+vidup.u64 q0, r0, #1
+vidup.u32 q0, r0, #3
+vidup.u32 q0, r0, #0
+viwdup.s16 q0, r0, r1, #1
+viwdup.u64 q0, r0, r1, #1
+viwdup.u32 q0, r0, r1, #3
+viwdup.u32 q0, r0, r1, #0
+viwdup.u32 q0, r0, sp, #1
+viwdup.u32 q0, r0, pc, #1
+cond1
+cond2
+it eq
+vidupeq.u32 q0, r0, #1
+vidupeq.u32 q0, r0, #1
+vpst
+vidupeq.u32 q0, r0, #1
+vidupt.u32 q0, r0, #1
+vpst
+vidup.u32 q0, r0, #1
+it eq
+viwdupeq.u32 q0, r0, r1, #1
+viwdupeq.u32 q0, r0, r1, #1
+vpst
+viwdupeq.u32 q0, r0, r1, #1
+viwdupt.u32 q0, r0, r1, #1
+vpst
+viwdup.u32 q0, r0, r1, #1