Accept valid one byte signed and unsigned values for the IMM8 operand.

opcodes/
	* ppc-opc.c (IMM8): Use PPC_OPERAND_SIGNOPT.

gas/
	* testsuite/gas/ppc/power9.d <xxspltib>: Add additional operand tests.
	* testsuite/gas/ppc/power9.s: Likewise.

gas/ChangeLog

@@ -1,3 +1,8 @@
+2016-05-13  Peter Bergner <bergner@vnet.ibm.com>
+
+	* testsuite/gas/ppc/power9.d <xxspltib>: Add additional operand tests.
+	* testsuite/gas/ppc/power9.s: Likewise.
+
 2016-05-13  Alan Modra  <amodra@gmail.com>
 
 	* config/obj-coff.c (weak_uniquify): Delete unused var.

gas/testsuite/gas/ppc/power9.d

@@ -140,6 +140,8 @@ Disassembly of section \.text:
 .*:	(f0 80 2a 94|94 2a 80 f0) 	xxextractuw vs4,vs5,0
 .*:	(f1 0f 92 97|97 92 0f f1) 	xxextractuw vs40,vs50,15
 .*:	(f0 80 02 d0|d0 02 80 f0) 	xxspltib vs4,0
+.*:	(f0 80 02 d0|d0 02 80 f0) 	xxspltib vs4,0
+.*:	(f1 27 fa d1|d1 fa 27 f1) 	xxspltib vs41,255
 .*:	(f1 27 fa d1|d1 fa 27 f1) 	xxspltib vs41,255
 .*:	(f0 a0 32 d4|d4 32 a0 f0) 	xxinsertw vs5,vs6,0
 .*:	(f2 4f e2 d7|d7 e2 4f f2) 	xxinsertw vs50,vs60,15

gas/testsuite/gas/ppc/power9.s

@@ -131,7 +131,9 @@ power9:
 	xxextractuw 4,5,0x0
 	xxextractuw 40,50,0xf
 	xxspltib    4,0x0
+	xxspltib    4,-256
 	xxspltib    41,255
+	xxspltib    41,-1
 	xxinsertw   5,6,0
 	xxinsertw   50,60,0xf
 	xxbrh       6,7

opcodes/ChangeLog

@@ -1,3 +1,7 @@
+2016-05-13  Peter Bergner <bergner@vnet.ibm.com>
+
+	* ppc-opc.c (IMM8): Use PPC_OPERAND_SIGNOPT.
+
 2016-05-11  Andrew Bennett  <andrew.bennett@imgtec.com>
 
 	* mips-dis.c (mips_arch_choices): Add ASE_DSPR3 to mips32r6 and

opcodes/ppc-opc.c

@@ -942,7 +942,7 @@ const struct powerpc_operand powerpc_operands[] =
 
   /* The 8-bit IMM8 field in a XX1 form instruction.  */
 #define IMM8 IH + 1
-  { 0xff, 11, NULL, NULL, 0 },
+  { 0xff, 11, NULL, NULL, PPC_OPERAND_SIGNOPT },
 };
 
 const unsigned int num_powerpc_operands = (sizeof (powerpc_operands)