--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -10946,8 +10946,11 @@ s_insn (int dummy ATTRIBUTE_UNUSED)
   if (*line == ',')
     {
       i386_operand_type combined;
+      expressionS *disp_exp = NULL;
       bool changed;
 
+      i.memshift = -1;
+
       ptr = parse_operands (line + 1, &i386_mnemonics[MN__insn]);
       this_operand = -1;
       if (!ptr)
@@ -11093,12 +11096,40 @@ s_insn (int dummy ATTRIBUTE_UNUSED)
 
       /* Establish operand size encoding.  */
       operand_type_set (&combined, 0);
+
       for (j = i.imm_operands; j < i.operands; ++j)
 	{
 	  i.types[j].bitfield.instance = InstanceNone;
 
 	  if (operand_type_check (i.types[j], disp))
-	    i.types[j].bitfield.baseindex = 1;
+	    {
+	      i.types[j].bitfield.baseindex = 1;
+	      disp_exp = i.op[j].disps;
+	    }
+
+	  if (evex && i.types[j].bitfield.baseindex)
+	    {
+	      unsigned int n = i.memshift;
+
+	      if (i.types[j].bitfield.byte)
+		n = 0;
+	      else if (i.types[j].bitfield.word)
+		n = 1;
+	      else if (i.types[j].bitfield.dword)
+		n = 2;
+	      else if (i.types[j].bitfield.qword)
+		n = 3;
+	      else if (i.types[j].bitfield.xmmword)
+		n = 4;
+	      else if (i.types[j].bitfield.ymmword)
+		n = 5;
+	      else if (i.types[j].bitfield.zmmword)
+		n = 6;
+
+	      if (i.memshift < 32 && n != i.memshift)
+		as_warn ("conflicting memory operand size specifiers");
+	      i.memshift = n;
+	    }
 
 	  if ((i.broadcast.type || i.broadcast.bytes)
 	      && j == i.broadcast.operand)
@@ -11108,6 +11139,16 @@ s_insn (int dummy ATTRIBUTE_UNUSED)
 	  combined.bitfield.class = ClassNone;
 	}
 
+      switch ((i.broadcast.type ? i.broadcast.type : 1)
+	      << (i.memshift < 32 ? i.memshift : 0))
+	{
+	case 64: combined.bitfield.zmmword = 1; break;
+	case 32: combined.bitfield.ymmword = 1; break;
+	case 16: combined.bitfield.xmmword = 1; break;
+	case  8: combined.bitfield.qword = 1; break;
+	case  4: combined.bitfield.dword = 1; break;
+	}
+
       if (i.vec_encoding == vex_encoding_default)
 	{
 	  if (flag_code == CODE_64BIT && combined.bitfield.qword)
@@ -11153,8 +11194,40 @@ s_insn (int dummy ATTRIBUTE_UNUSED)
 	      else if (combined.bitfield.xmmword)
 	        i.tm.opcode_modifier.evex = EVEX128;
 	    }
+
+	  if (i.memshift >= 32)
+	    {
+	      unsigned int n = 0;
+
+	      switch (i.tm.opcode_modifier.evex)
+		{
+		case EVEX512: n = 64; break;
+		case EVEX256: n = 32; break;
+		case EVEX128: n = 16; break;
+		}
+
+	      if (i.broadcast.type)
+		n /= i.broadcast.type;
+
+	      if (n > 0)
+		for (i.memshift = 0; !(n & 1); n >>= 1)
+		  ++i.memshift;
+	      else if (disp_exp != NULL && disp_exp->X_op == O_constant
+		       && disp_exp->X_add_number != 0
+		       && i.disp_encoding != disp_encoding_32bit)
+		{
+		  if (!quiet_warnings)
+		    as_warn ("cannot determine memory operand size");
+		  i.disp_encoding = disp_encoding_32bit;
+		}
+	    }
 	}
 
+      if (i.memshift >= 32)
+	i.memshift = 0;
+      else if (!evex)
+	i.vec_encoding = vex_encoding_error;
+
       if (i.disp_operands && !optimize_disp (&i.tm))
 	goto done;
 
@@ -11329,6 +11402,29 @@ check_VecOperations (char *op_string)
 
 	      i.broadcast.type = bcst_type;
 	      i.broadcast.operand = this_operand;
+
+	      /* For .insn a data size specifier may be appended.  */
+	      if (dot_insn () && *op_string == ':')
+		goto dot_insn_modifier;
+	    }
+	  /* Check .insn special cases.  */
+	  else if (dot_insn () && *op_string == ':')
+	    {
+	    dot_insn_modifier:
+	      if (op_string[1] == 'd')
+		{
+		  unsigned long n;
+
+		  if (i.memshift < 32)
+		    goto duplicated_vec_op;
+
+		  n = strtoul (op_string + 2, &end_op, 0);
+		  if (n)
+		    for (i.memshift = 0; !(n & 1); n >>= 1)
+		      ++i.memshift;
+		  if (i.memshift < 32 && n == 1)
+		    op_string = end_op;
+		}
 	    }
 	  /* Check masking operation.  */
 	  else if ((mask = parse_register (op_string, &end_op)) != NULL)
--- a/gas/testsuite/gas/i386/insn-32.d
+++ b/gas/testsuite/gas/i386/insn-32.d
@@ -23,6 +23,7 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	c5 f1 58 d0[ 	]+vaddpd %xmm0,%xmm1,%xmm2
 [ 	]*[a-f0-9]+:	c5 f5 58 d0[ 	]+vaddpd %ymm0,%ymm1,%ymm2
 [ 	]*[a-f0-9]+:	c5 f2 58 d0[ 	]+vaddss %xmm0,%xmm1,%xmm2
+[ 	]*[a-f0-9]+:	62 f1 76 08 58 50 01[ 	]+\{evex\} vaddss (0x)?4\(%eax\),%xmm1,%xmm2
 [ 	]*[a-f0-9]+:	c4 e3 69 68 19 00[ 	]+vfmaddps %xmm0,\(%ecx\),%xmm2,%xmm3
 [ 	]*[a-f0-9]+:	c4 e3 e9 68 19 00[ 	]+vfmaddps \(%ecx\),%xmm0,%xmm2,%xmm3
 [ 	]*[a-f0-9]+:	c4 e3 e9 68 18 10[ 	]+vfmaddps \(%eax\),%xmm1,%xmm2,%xmm3
@@ -31,4 +32,13 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	62 f1 74 18 58 d0[ 	]+vaddps \{rn-sae\},%zmm0,%zmm1,%zmm2
 [ 	]*[a-f0-9]+:	c4 e2 79 92 1c 48[ 	]+vgatherdps %xmm0,\(%eax,%xmm1,2\),%xmm3
 [ 	]*[a-f0-9]+:	62 f2 fd 0c 93 1c 48[ 	]+vgatherqpd \(%eax,%xmm1,2\),%xmm3\{%k4\}
+[ 	]*[a-f0-9]+:	62 f2 7d 28 88 48 01[ 	]+vexpandps (0x)?4\(%eax\),%ymm1
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%eax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%eax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%eax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%eax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%eax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%eax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 7c 48 5a 40 01[ 	]+vcvtph2pd 0x10\(%eax\),%zmm0
+[ 	]*[a-f0-9]+:	62 f5 7c 58 5a 40 01[ 	]+vcvtph2pd (0x)?2\(%eax\)\{1to8\},%zmm0
 #pass
--- a/gas/testsuite/gas/i386/insn-32.s
+++ b/gas/testsuite/gas/i386/insn-32.s
@@ -36,6 +36,7 @@ insn:
 
 	# vaddss
 	.insn VEX.LIG.F3.0F 0x58, %xmm0, %xmm1, %xmm2
+	.insn EVEX.LIG.F3.0F.W0 0x58, 4(%eax){:d4}, %xmm1, %xmm2
 
 	# vfmaddps
 	.insn VEX.66.0F3A.W0 0x68, %xmm0, (%ecx), %xmm2, %xmm3
@@ -52,3 +53,18 @@ insn:
 	# vgather...
 	.insn VEX.66.0f38.W0 0x92, %xmm0, (%eax, %xmm1, 2), %xmm3
 	.insn EVEX.66.0f38.W1 0x93, (%eax, %xmm1, 2), %xmm3{%k4}
+
+	# vexpandps
+	.insn EVEX.66.0F38.W0 0x88, 4(%eax){:d4}, %ymm1
+
+	# vcvtpd2phz
+	.insn EVEX.512.66.M5.W1 0x5a, 64(%eax), %xmm0
+	.insn EVEX.66.M5.W1 0x5a, 64(%eax), %zmm0
+	.insn EVEX.66.M5.W1 0x5a, 64(%eax){:d64}, %xmm0
+	.insn EVEX.512.66.M5.W1 0x5a, 8(%eax){1to8}, %xmm0
+	.insn EVEX.66.M5.W1 0x5a, 8(%eax){1to8}, %zmm0
+	.insn EVEX.66.M5.W1 0x5a, 8(%eax){1to8:d8}, %xmm0
+
+	# vcvtph2pd
+	.insn EVEX.M5.W0 0x5a, 16(%eax){:d16}, %zmm0
+	.insn EVEX.M5.W0 0x5a, 2(%eax){1to8:d2}, %zmm0
--- a/gas/testsuite/gas/i386/insn-64.d
+++ b/gas/testsuite/gas/i386/insn-64.d
@@ -25,6 +25,7 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	c4 c1 71 58 d0[ 	]+vaddpd %xmm8,%xmm1,%xmm2
 [ 	]*[a-f0-9]+:	c5 b5 58 d0[ 	]+vaddpd %ymm0,%ymm9,%ymm2
 [ 	]*[a-f0-9]+:	c5 72 58 d0[ 	]+vaddss %xmm0,%xmm1,%xmm10
+[ 	]*[a-f0-9]+:	62 f1 76 08 58 50 01[ 	]+\{evex\} vaddss (0x)?4\(%rax\),%xmm1,%xmm2
 [ 	]*[a-f0-9]+:	c4 e3 69 68 19 80[ 	]+vfmaddps %xmm8,\(%rcx\),%xmm2,%xmm3
 [ 	]*[a-f0-9]+:	67 c4 e3 e9 68 19 00[ 	]+vfmaddps \(%ecx\),%xmm0,%xmm2,%xmm3
 [ 	]*[a-f0-9]+:	c4 c3 e9 68 18 10[ 	]+vfmaddps \(%r8\),%xmm1,%xmm2,%xmm3
@@ -42,4 +43,13 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	62 f2 fd 04 93 1c 48[ 	]+vgatherqpd \(%rax,%xmm17,2\),%xmm3\{%k4\}
 [ 	]*[a-f0-9]+:	62 72 fd 0c 93 1c 48[ 	]+vgatherqpd \(%rax,%xmm1,2\),%xmm11\{%k4\}
 [ 	]*[a-f0-9]+:	62 e2 fd 0c 93 1c 48[ 	]+vgatherqpd \(%rax,%xmm1,2\),%xmm19\{%k4\}
+[ 	]*[a-f0-9]+:	62 f2 7d 28 88 48 01[ 	]+vexpandps (0x)?4\(%rax\),%ymm1
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%rax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%rax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 48 5a 40 01[ 	]+vcvtpd2phz 0x40\(%rax\),%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%rax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%rax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 fd 58 5a 40 01[ 	]+vcvtpd2ph (0x)?8\(%rax\)\{1to8\},%xmm0
+[ 	]*[a-f0-9]+:	62 f5 7c 48 5a 40 01[ 	]+vcvtph2pd 0x10\(%rax\),%zmm0
+[ 	]*[a-f0-9]+:	62 f5 7c 58 5a 40 01[ 	]+vcvtph2pd (0x)?2\(%rax\)\{1to8\},%zmm0
 #pass
--- a/gas/testsuite/gas/i386/insn-64.s
+++ b/gas/testsuite/gas/i386/insn-64.s
@@ -38,6 +38,7 @@ insn:
 
 	# vaddss
 	.insn VEX.LIG.F3.0F 0x58, %xmm0, %xmm1, %xmm10
+	.insn EVEX.LIG.F3.0F.W0 0x58, 4(%rax){:d4}, %xmm1, %xmm2
 
 	# vfmaddps
 	.insn VEX.66.0F3A.W0 0x68, %xmm8, (%rcx), %xmm2, %xmm3
@@ -63,3 +64,18 @@ insn:
 	.insn EVEX.66.0f38.W1 0x93, (%rax, %xmm17, 2), %xmm3{%k4}
 	.insn EVEX.66.0f38.W1 0x93, (%rax, %xmm1, 2), %xmm11{%k4}
 	.insn EVEX.66.0f38.W1 0x93, (%rax, %xmm1, 2), %xmm19{%k4}
+
+	# vexpandps
+	.insn EVEX.66.0F38.W0 0x88, 4(%rax){:d4}, %ymm1
+
+	# vcvtpd2phz
+	.insn EVEX.512.66.M5.W1 0x5a, 64(%rax), %xmm0
+	.insn EVEX.66.M5.W1 0x5a, 64(%rax), %zmm0
+	.insn EVEX.66.M5.W1 0x5a, 64(%rax){:d64}, %xmm0
+	.insn EVEX.512.66.M5.W1 0x5a, 8(%rax){1to8}, %xmm0
+	.insn EVEX.66.M5.W1 0x5a, 8(%rax){1to8}, %zmm0
+	.insn EVEX.66.M5.W1 0x5a, 8(%rax){1to8:d8}, %xmm0
+
+	# vcvtph2pd
+	.insn EVEX.M5.W0 0x5a, 16(%rax){:d16}, %zmm0
+	.insn EVEX.M5.W0 0x5a, 2(%rax){1to8:d2}, %zmm0
