--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -4846,7 +4846,11 @@ static INLINE bool may_need_pass2 (const
 {
   return t->opcode_modifier.sse2avx
 	 /* Note that all SSE2AVX templates have at least one operand.  */
-	 && t->operand_types[t->operands - 1].bitfield.class == RegSIMD;
+	 ? t->operand_types[t->operands - 1].bitfield.class == RegSIMD
+	 : (t->opcode_modifier.opcodespace == SPACE_0F
+	    && (t->base_opcode | 1) == 0xbf)
+	   || (t->opcode_modifier.opcodespace == SPACE_BASE
+	       && t->base_opcode == 0x63);
 }
 
 /* This is the guts of the machine-dependent assembler.  LINE points to a
--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -73,6 +73,7 @@ if [gas_32_check] then {
     run_dump_test "amd"
     run_dump_test "katmai"
     run_dump_test "jump"
+    run_dump_test "movs32"
     run_dump_test "movz32"
     run_dump_test "relax-1"
     run_dump_test "relax-2"
@@ -815,6 +816,7 @@ if [gas_64_check] then {
     run_dump_test "x86-64-segovr"
     run_list_test "x86-64-inval-seg" "-al"
     run_dump_test "x86-64-branch"
+    run_dump_test "movs64"
     run_dump_test "movz64"
     run_dump_test "x86-64-relax-1"
     run_dump_test "svme64"
--- /dev/null
+++ b/gas/testsuite/gas/i386/movs.s
@@ -0,0 +1,39 @@
+	.text
+movs:
+	movsb	%al,%ax
+	movsb	(%eax),%ax
+	movsb	%al,%eax
+	movsb	(%eax),%eax
+.ifdef x86_64
+	movsb	%al,%rax
+	movsb	(%rax),%rax
+.endif
+
+	movsbw	%al,%ax
+	movsbw	(%eax),%ax
+	movsbl	%al,%eax
+	movsbl	(%eax),%eax
+.ifdef x86_64
+	movsbq	%al,%rax
+	movsbq	(%rax),%rax
+.endif
+
+	movsw	%ax,%eax
+	movsw	(%eax),%eax
+.ifdef x86_64
+	movsw	%ax,%rax
+	movsw	(%rax),%rax
+.endif
+
+	movswl	%ax,%eax
+	movswl	(%eax),%eax
+.ifdef x86_64
+	movswq	%ax,%rax
+	movswq	(%rax),%rax
+
+	movsl	%eax,%rax
+	movsl	(%rax),%rax
+
+	movslq	%eax,%rax
+	movslq	(%rax),%rax
+.endif
--- /dev/null
+++ b/gas/testsuite/gas/i386/movs32.d
@@ -0,0 +1,22 @@
+#objdump: -dw
+#source: movs.s
+#name: x86 mov with sign-extend (32-bit object)
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+ <movs>:
+[ 	]*[a-f0-9]+:	66 0f be c0 *	movsbw %al,%ax
+[ 	]*[a-f0-9]+:	66 0f be 00 *	movsbw \(%eax\),%ax
+[ 	]*[a-f0-9]+:	0f be c0 *	movsbl %al,%eax
+[ 	]*[a-f0-9]+:	0f be 00 *	movsbl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	66 0f be c0 *	movsbw %al,%ax
+[ 	]*[a-f0-9]+:	66 0f be 00 *	movsbw \(%eax\),%ax
+[ 	]*[a-f0-9]+:	0f be c0 *	movsbl %al,%eax
+[ 	]*[a-f0-9]+:	0f be 00 *	movsbl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	0f bf c0 *	movswl %ax,%eax
+[ 	]*[a-f0-9]+:	0f bf 00 *	movswl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	0f bf c0 *	movswl %ax,%eax
+[ 	]*[a-f0-9]+:	0f bf 00 *	movswl \(%eax\),%eax
+#pass
--- /dev/null
+++ b/gas/testsuite/gas/i386/movs64.d
@@ -0,0 +1,30 @@
+#objdump: -dw
+#source: movs.s
+#name: x86 mov with sign-extend (64-bit object)
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+ <movs>:
+[ 	]*[a-f0-9]+:	66 0f be c0 *	movsbw %al,%ax
+[ 	]*[a-f0-9]+:	67 66 0f be 00 *	movsbw \(%eax\),%ax
+[ 	]*[a-f0-9]+:	0f be c0 *	movsbl %al,%eax
+[ 	]*[a-f0-9]+:	67 0f be 00 *	movsbl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	48 0f be c0 *	movsbq %al,%rax
+[ 	]*[a-f0-9]+:	48 0f be 00 *	movsbq \(%rax\),%rax
+[ 	]*[a-f0-9]+:	66 0f be c0 *	movsbw %al,%ax
+[ 	]*[a-f0-9]+:	67 66 0f be 00 *	movsbw \(%eax\),%ax
+[ 	]*[a-f0-9]+:	0f be c0 *	movsbl %al,%eax
+[ 	]*[a-f0-9]+:	67 0f be 00 *	movsbl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	48 0f be c0 *	movsbq %al,%rax
+[ 	]*[a-f0-9]+:	48 0f be 00 *	movsbq \(%rax\),%rax
+[ 	]*[a-f0-9]+:	0f bf c0 *	movswl %ax,%eax
+[ 	]*[a-f0-9]+:	67 0f bf 00 *	movswl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	48 0f bf c0 *	movswq %ax,%rax
+[ 	]*[a-f0-9]+:	48 0f bf 00 *	movswq \(%rax\),%rax
+[ 	]*[a-f0-9]+:	0f bf c0 *	movswl %ax,%eax
+[ 	]*[a-f0-9]+:	67 0f bf 00 *	movswl \(%eax\),%eax
+[ 	]*[a-f0-9]+:	48 0f bf c0 *	movswq %ax,%rax
+[ 	]*[a-f0-9]+:	48 0f bf 00 *	movswq \(%rax\),%rax
+#pass
--- a/gas/testsuite/gas/i386/movx16.l
+++ b/gas/testsuite/gas/i386/movx16.l
@@ -41,11 +41,11 @@
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %cl
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cl
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %cx
+[ 	]*[1-9][0-9]* \?\?\?\? 0FBEC8[ 	]+movsb	%al, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 660FBEC8[ 	]+movsb	%al, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
@@ -82,7 +82,7 @@
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movsw	%al, %ecx
-[ 	]*[1-9][0-9]*[ 	]+movsw	%ax, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 660FBFC8[ 	]+movsw	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movswl	%al, %cl
--- a/gas/testsuite/gas/i386/movx32.l
+++ b/gas/testsuite/gas/i386/movx32.l
@@ -41,11 +41,11 @@
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %cl
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cl
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %cx
+[ 	]*[1-9][0-9]* \?\?\?\? 660FBEC8[ 	]+movsb	%al, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 0FBEC8[ 	]+movsb	%al, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
@@ -82,7 +82,7 @@
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movsw	%al, %ecx
-[ 	]*[1-9][0-9]*[ 	]+movsw	%ax, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 0FBFC8[ 	]+movsw	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movswl	%al, %cl
--- a/gas/testsuite/gas/i386/movx64.l
+++ b/gas/testsuite/gas/i386/movx64.l
@@ -106,17 +106,17 @@
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cl
 [ 	]*[1-9][0-9]*[ 	]+movsb	%rax, %cl
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %cx
+[ 	]*[1-9][0-9]* \?\?\?\? 660FBEC8[ 	]+movsb	%al, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %cx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%rax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 0FBEC8[ 	]+movsb	%al, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%rax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
-[ 	]*[1-9][0-9]*[ 	]+movsb	%al, %rcx
+[ 	]*[1-9][0-9]* \?\?\?\? 480FBEC8[ 	]+movsb	%al, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%ax, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%eax, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movsb	%rax, %rcx
@@ -192,12 +192,12 @@
 [ 	]*[1-9][0-9]*[ 	]+movsw	%rax, %cx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movsw	%al, %ecx
-[ 	]*[1-9][0-9]*[ 	]+movsw	%ax, %ecx
+[ 	]*[1-9][0-9]* \?\?\?\? 0FBFC8[ 	]+movsw	%ax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %ecx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%rax, %ecx
 [ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movsw	%al, %rcx
-[ 	]*[1-9][0-9]*[ 	]+movsw	%ax, %rcx
+[ 	]*[1-9][0-9]* \?\?\?\? 480FBFC8[ 	]+movsw	%ax, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%eax, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movsw	%rax, %rcx
 [ 	]*[1-9][0-9]*[ 	]*
@@ -241,6 +241,46 @@
 [ 	]*[1-9][0-9]*[ 	]+movswq	%eax, %rcx
 [ 	]*[1-9][0-9]*[ 	]+movswq	%rax, %rcx
 [ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movsl	%al, %cl
+[ 	]*[1-9][0-9]*[ 	]+movsl	%ax, %cl
+[ 	]*[1-9][0-9]*[ 	]+movsl	%eax, %cl
+[ 	]*[1-9][0-9]*[ 	]+movsl	%rax, %cl
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movsl	%al, %cx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%ax, %cx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%eax, %cx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%rax, %cx
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movsl	%al, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%ax, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%eax, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%rax, %ecx
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movsl	%al, %rcx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%ax, %rcx
+[ 	]*[1-9][0-9]* \?\?\?\? 4863C8[ 	]+movsl	%eax, %rcx
+[ 	]*[1-9][0-9]*[ 	]+movsl	%rax, %rcx
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movslq	%al, %cl
+[ 	]*[1-9][0-9]*[ 	]+movslq	%ax, %cl
+[ 	]*[1-9][0-9]*[ 	]+movslq	%eax, %cl
+[ 	]*[1-9][0-9]*[ 	]+movslq	%rax, %cl
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movslq	%al, %cx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%ax, %cx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%eax, %cx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%rax, %cx
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movslq	%al, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%ax, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%eax, %ecx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%rax, %ecx
+[ 	]*[1-9][0-9]*[ 	]*
+[ 	]*[1-9][0-9]*[ 	]+movslq	%al, %rcx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%ax, %rcx
+[ 	]*[1-9][0-9]* \?\?\?\? 4863C8[ 	]+movslq	%eax, %rcx
+[ 	]*[1-9][0-9]*[ 	]+movslq	%rax, %rcx
+[ 	]*[1-9][0-9]*[ 	]*
 [ 	]*[1-9][0-9]*[ 	]+movzx:
 [ 	]*[1-9][0-9]*[ 	]+movzx	%al, %cl
 [ 	]*[1-9][0-9]*[ 	]+movzx	%ax, %cl
--- a/gas/testsuite/gas/i386/movx64.s
+++ b/gas/testsuite/gas/i386/movx64.s
@@ -241,6 +241,46 @@ movsx:
 	movswq	%eax, %rcx
 	movswq	%rax, %rcx
 
+	movsl	%al, %cl
+	movsl	%ax, %cl
+	movsl	%eax, %cl
+	movsl	%rax, %cl
+
+	movsl	%al, %cx
+	movsl	%ax, %cx
+	movsl	%eax, %cx
+	movsl	%rax, %cx
+
+	movsl	%al, %ecx
+	movsl	%ax, %ecx
+	movsl	%eax, %ecx
+	movsl	%rax, %ecx
+
+	movsl	%al, %rcx
+	movsl	%ax, %rcx
+	movsl	%eax, %rcx
+	movsl	%rax, %rcx
+
+	movslq	%al, %cl
+	movslq	%ax, %cl
+	movslq	%eax, %cl
+	movslq	%rax, %cl
+
+	movslq	%al, %cx
+	movslq	%ax, %cx
+	movslq	%eax, %cx
+	movslq	%rax, %cx
+
+	movslq	%al, %ecx
+	movslq	%ax, %ecx
+	movslq	%eax, %ecx
+	movslq	%rax, %ecx
+
+	movslq	%al, %rcx
+	movslq	%ax, %rcx
+	movslq	%eax, %rcx
+	movslq	%rax, %rcx
+
 movzx:
 	movzx	%al, %cl
 	movzx	%ax, %cl
--- a/opcodes/i386-opc.tbl
+++ b/opcodes/i386-opc.tbl
@@ -162,14 +162,9 @@ mov, 0xf24, None, Cpu386|CpuNo64, D|RegM
 movbe, 0x0f38f0, None, CpuMovbe, D|Modrm|No_bSuf|No_sSuf|No_ldSuf, { Word|Dword|Qword|Unspecified|BaseIndex, Reg16|Reg32|Reg64 }
 
 // Move with sign extend.
-// "movsbl" & "movsbw" must not be unified into "movsb" to avoid
-// conflict with the "movs" string move instruction.
-movsbl, 0xfbe, None, Cpu386, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg8|Byte|Unspecified|BaseIndex, Reg32 }
-movsbw, 0xfbe, None, Cpu386, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg8|Byte|Unspecified|BaseIndex, Reg16 }
-movswl, 0xfbf, None, Cpu386, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg16|Word|Unspecified|BaseIndex, Reg32 }
-movsbq, 0xfbe, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf|Size64, { Reg8|Byte|Unspecified|BaseIndex, Reg64 }
-movswq, 0xfbf, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf|Size64, { Reg16|Word|Unspecified|BaseIndex, Reg64 }
-movslq, 0x63, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf|Size64, { Reg32|Dword|Unspecified|BaseIndex, Reg64 }
+movsb, 0xfbe, None, Cpu386, Modrm|No_bSuf|No_sSuf|No_ldSuf, { Reg8|Unspecified|BaseIndex, Reg16|Reg32|Reg64 }
+movsw, 0xfbf, None, Cpu386, Modrm|No_bSuf|No_wSuf|No_sSuf|No_ldSuf, { Reg16|Unspecified|BaseIndex, Reg32|Reg64 }
+movsl, 0x63, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_ldSuf, { Reg32|Unspecified|BaseIndex, Reg64 }
 movsx, 0xfbe, None, Cpu386, W|Modrm|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg8|Reg16|Unspecified|BaseIndex, Reg16|Reg32|Reg64 }
 movsx, 0x63, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg32|Unspecified|BaseIndex, Reg32|Reg64 }
 movsxd, 0x63, None, Cpu64, Modrm|No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Reg32|Unspecified|BaseIndex, Reg32|Reg64 }
