[AArch64] PR target/20667, fix disassembler for the "special" optional SYS_Rt operand for "ic"/"tlbi"

gas/
	PR target/20667
	* testsuite/gas/aarch64/sys-rt-reg.s: Test source for instructions
	using SYS_Rt reg.
	* testsuite/gas/aarch64/sys-rt-reg.d: New testcase.

opcodes/
	PR target/20667
	* aarch64-opc.c (aarch64_print_operand): Always print operand if
	it's available.

3 files changed, 162 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 29b9cf6..70b4af4 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2016-10-07  Jiong Wang  <jiong.wang@arm.com>
+
+	PR target/20667
+	* testsuite/gas/aarch64/sys-rt-reg.s: Test source for instructions using
+	SYS_Rt reg.
+	* testsuite/gas/aarch64/sys-rt-reg.d: New testcase.
+
 2016-10-06  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* testsuite/gas/arc/leave_enter.d: New file.
diff --git a/gas/testsuite/gas/aarch64/sys-rt-reg.d b/gas/testsuite/gas/aarch64/sys-rt-reg.d
new file mode 100644
index 0000000..4cca4f7
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sys-rt-reg.d
@@ -0,0 +1,134 @@
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+.* <.*>:
+.*:	d508711f 	ic	ialluis
+.*:	d508751f 	ic	iallu
+.*:	d50b7520 	ic	ivau, x0
+.*:	d50b7523 	ic	ivau, x3
+.*:	d50b752f 	ic	ivau, x15
+.*:	d50b753a 	ic	ivau, x26
+.*:	d50b753f 	ic	ivau, xzr
+.*:	d508871f 	tlbi	vmalle1
+.*:	d508831f 	tlbi	vmalle1is
+.*:	d50c87df 	tlbi	vmalls12e1
+.*:	d50c83df 	tlbi	vmalls12e1is
+.*:	d50c871f 	tlbi	alle2
+.*:	d50c831f 	tlbi	alle2is
+.*:	d50c879f 	tlbi	alle1
+.*:	d50c839f 	tlbi	alle1is
+.*:	d50e871f 	tlbi	alle3
+.*:	d50e831f 	tlbi	alle3is
+.*:	d5088720 	tlbi	vae1, x0
+.*:	d5088723 	tlbi	vae1, x3
+.*:	d508872f 	tlbi	vae1, x15
+.*:	d508873a 	tlbi	vae1, x26
+.*:	d508873f 	tlbi	vae1, xzr
+.*:	d5088740 	tlbi	aside1, x0
+.*:	d5088743 	tlbi	aside1, x3
+.*:	d508874f 	tlbi	aside1, x15
+.*:	d508875a 	tlbi	aside1, x26
+.*:	d508875f 	tlbi	aside1, xzr
+.*:	d5088760 	tlbi	vaae1, x0
+.*:	d5088763 	tlbi	vaae1, x3
+.*:	d508876f 	tlbi	vaae1, x15
+.*:	d508877a 	tlbi	vaae1, x26
+.*:	d508877f 	tlbi	vaae1, xzr
+.*:	d5088320 	tlbi	vae1is, x0
+.*:	d5088323 	tlbi	vae1is, x3
+.*:	d508832f 	tlbi	vae1is, x15
+.*:	d508833a 	tlbi	vae1is, x26
+.*:	d508833f 	tlbi	vae1is, xzr
+.*:	d5088340 	tlbi	aside1is, x0
+.*:	d5088343 	tlbi	aside1is, x3
+.*:	d508834f 	tlbi	aside1is, x15
+.*:	d508835a 	tlbi	aside1is, x26
+.*:	d508835f 	tlbi	aside1is, xzr
+.*:	d5088360 	tlbi	vaae1is, x0
+.*:	d5088363 	tlbi	vaae1is, x3
+.*:	d508836f 	tlbi	vaae1is, x15
+.*:	d508837a 	tlbi	vaae1is, x26
+.*:	d508837f 	tlbi	vaae1is, xzr
+.*:	d50c8020 	tlbi	ipas2e1is, x0
+.*:	d50c8023 	tlbi	ipas2e1is, x3
+.*:	d50c802f 	tlbi	ipas2e1is, x15
+.*:	d50c803a 	tlbi	ipas2e1is, x26
+.*:	d50c803f 	tlbi	ipas2e1is, xzr
+.*:	d50c80a0 	tlbi	ipas2le1is, x0
+.*:	d50c80a3 	tlbi	ipas2le1is, x3
+.*:	d50c80af 	tlbi	ipas2le1is, x15
+.*:	d50c80ba 	tlbi	ipas2le1is, x26
+.*:	d50c80bf 	tlbi	ipas2le1is, xzr
+.*:	d50c8420 	tlbi	ipas2e1, x0
+.*:	d50c8423 	tlbi	ipas2e1, x3
+.*:	d50c842f 	tlbi	ipas2e1, x15
+.*:	d50c843a 	tlbi	ipas2e1, x26
+.*:	d50c843f 	tlbi	ipas2e1, xzr
+.*:	d50c84a0 	tlbi	ipas2le1, x0
+.*:	d50c84a3 	tlbi	ipas2le1, x3
+.*:	d50c84af 	tlbi	ipas2le1, x15
+.*:	d50c84ba 	tlbi	ipas2le1, x26
+.*:	d50c84bf 	tlbi	ipas2le1, xzr
+.*:	d50c8720 	tlbi	vae2, x0
+.*:	d50c8723 	tlbi	vae2, x3
+.*:	d50c872f 	tlbi	vae2, x15
+.*:	d50c873a 	tlbi	vae2, x26
+.*:	d50c873f 	tlbi	vae2, xzr
+.*:	d50c8320 	tlbi	vae2is, x0
+.*:	d50c8323 	tlbi	vae2is, x3
+.*:	d50c832f 	tlbi	vae2is, x15
+.*:	d50c833a 	tlbi	vae2is, x26
+.*:	d50c833f 	tlbi	vae2is, xzr
+.*:	d50e8720 	tlbi	vae3, x0
+.*:	d50e8723 	tlbi	vae3, x3
+.*:	d50e872f 	tlbi	vae3, x15
+.*:	d50e873a 	tlbi	vae3, x26
+.*:	d50e873f 	tlbi	vae3, xzr
+.*:	d50e8320 	tlbi	vae3is, x0
+.*:	d50e8323 	tlbi	vae3is, x3
+.*:	d50e832f 	tlbi	vae3is, x15
+.*:	d50e833a 	tlbi	vae3is, x26
+.*:	d50e833f 	tlbi	vae3is, xzr
+.*:	d50883a0 	tlbi	vale1is, x0
+.*:	d50883a3 	tlbi	vale1is, x3
+.*:	d50883af 	tlbi	vale1is, x15
+.*:	d50883ba 	tlbi	vale1is, x26
+.*:	d50883bf 	tlbi	vale1is, xzr
+.*:	d50c83a0 	tlbi	vale2is, x0
+.*:	d50c83a3 	tlbi	vale2is, x3
+.*:	d50c83af 	tlbi	vale2is, x15
+.*:	d50c83ba 	tlbi	vale2is, x26
+.*:	d50c83bf 	tlbi	vale2is, xzr
+.*:	d50e83a0 	tlbi	vale3is, x0
+.*:	d50e83a3 	tlbi	vale3is, x3
+.*:	d50e83af 	tlbi	vale3is, x15
+.*:	d50e83ba 	tlbi	vale3is, x26
+.*:	d50e83bf 	tlbi	vale3is, xzr
+.*:	d50883e0 	tlbi	vaale1is, x0
+.*:	d50883e3 	tlbi	vaale1is, x3
+.*:	d50883ef 	tlbi	vaale1is, x15
+.*:	d50883fa 	tlbi	vaale1is, x26
+.*:	d50883ff 	tlbi	vaale1is, xzr
+.*:	d50887a0 	tlbi	vale1, x0
+.*:	d50887a3 	tlbi	vale1, x3
+.*:	d50887af 	tlbi	vale1, x15
+.*:	d50887ba 	tlbi	vale1, x26
+.*:	d50887bf 	tlbi	vale1, xzr
+.*:	d50c87a0 	tlbi	vale2, x0
+.*:	d50c87a3 	tlbi	vale2, x3
+.*:	d50c87af 	tlbi	vale2, x15
+.*:	d50c87ba 	tlbi	vale2, x26
+.*:	d50c87bf 	tlbi	vale2, xzr
+.*:	d50e87a0 	tlbi	vale3, x0
+.*:	d50e87a3 	tlbi	vale3, x3
+.*:	d50e87af 	tlbi	vale3, x15
+.*:	d50e87ba 	tlbi	vale3, x26
+.*:	d50e87bf 	tlbi	vale3, xzr
+.*:	d50887e0 	tlbi	vaale1, x0
+.*:	d50887e3 	tlbi	vaale1, x3
+.*:	d50887ef 	tlbi	vaale1, x15
+.*:	d50887fa 	tlbi	vaale1, x26
+.*:	d50887ff 	tlbi	vaale1, xzr
diff --git a/gas/testsuite/gas/aarch64/sys-rt-reg.s b/gas/testsuite/gas/aarch64/sys-rt-reg.s
new file mode 100644
index 0000000..c5f5a70
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/sys-rt-reg.s
@@ -0,0 +1,21 @@
+// sys-rt-reg.s Test file for AArch64 instructions take SYS_Rt register.
+
+	.text
+
+	.irp	ic_op, ialluis, iallu
+	ic	\ic_op
+	.endr
+
+	.irp	rt, x0, x3, x15, x26, xzr
+	ic	ivau, \rt
+	.endr
+
+	.irp	tlbi_op, vmalle1, vmalle1is, vmalls12e1, vmalls12e1is, alle2, alle2is, alle1, alle1is, alle3, alle3is
+	tlbi	\tlbi_op
+	.endr
+
+	.irp	tlbi_op, vae1, aside1, vaae1, vae1is, aside1is, vaae1is, ipas2e1is, ipas2le1is, ipas2e1, ipas2le1, vae2, vae2is, vae3, vae3is, vale1is, vale2is, vale3is, vaale1is, vale1, vale2, vale3, vaale1
+	.irp    rt, x0, x3, x15, x26, xzr
+	tlbi	\tlbi_op, \rt
+	.endr
+	.endr