aarch64: Add support for Common Short Sequence Compression extension

This patch adds support for the CSSC extension and its corresponding
instructions: ABS, CNT, CTZ, SMAX, UMAX, SMIN, UMIN.

gas/ChangeLog:

        * config/tc-aarch64.c (parse_operands): Handle new operand types.
        * doc/c-aarch64.texi: Document new extension.
        * testsuite/gas/aarch64/cssc.d: New test.
        * testsuite/gas/aarch64/cssc.s: New test.

include/ChangeLog:

        * opcode/aarch64.h (AARCH64_FEATURE_CSSC): New feature Macro.
        (enum aarch64_opnd): New operand types.
        (enum aarch64_insn_class): New instruction class.

opcodes/ChangeLog:

	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.
	* aarch64-opc.c (operand_general_constraint_met_p): Update for new
	operand types.
	(aarch64_print_operand): Likewise.
	* aarch64-opc.h (enum aarch64_field_kind): Declare FLD_CSSC_imm8 field.
	* aarch64-tbl.h (aarch64_feature_cssc): Define new feature set.
	(CSSC): Define new feature set Macro.
	(CSSC_INSN): Define new instruction type.
	(aarch64_opcode_table): Add new instructions.

2 files changed, 334 insertions, 0 deletions

diff --git a/gas/testsuite/gas/aarch64/cssc.d b/gas/testsuite/gas/aarch64/cssc.d
new file mode 100644
index 0000000..4741b65
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/cssc.d
@@ -0,0 +1,174 @@
+#name: CSSC extension
+#as: -march=armv8-a+cssc
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+
+a.out:     file format elf64-littleaarch64
+
+
+Disassembly of section .text:
+
+0000000000000000 <.text>:
+   0:	5ac02000 	abs	w0, w0
+   4:	5ac02001 	abs	w1, w0
+   8:	5ac02100 	abs	w0, w8
+   c:	5ac020be 	abs	w30, w5
+  10:	5ac023c4 	abs	w4, w30
+  14:	dac02000 	abs	x0, x0
+  18:	dac02001 	abs	x1, x0
+  1c:	dac02100 	abs	x0, x8
+  20:	dac020be 	abs	x30, x5
+  24:	dac023c4 	abs	x4, x30
+  28:	5ac01c00 	cnt	w0, w0
+  2c:	5ac01c01 	cnt	w1, w0
+  30:	5ac01d00 	cnt	w0, w8
+  34:	5ac01cbe 	cnt	w30, w5
+  38:	5ac01fc4 	cnt	w4, w30
+  3c:	dac01c00 	cnt	x0, x0
+  40:	dac01c01 	cnt	x1, x0
+  44:	dac01d00 	cnt	x0, x8
+  48:	dac01cbe 	cnt	x30, x5
+  4c:	dac01fc4 	cnt	x4, x30
+  50:	5ac01800 	ctz	w0, w0
+  54:	5ac01801 	ctz	w1, w0
+  58:	5ac01900 	ctz	w0, w8
+  5c:	5ac018be 	ctz	w30, w5
+  60:	5ac01bc4 	ctz	w4, w30
+  64:	dac01800 	ctz	x0, x0
+  68:	dac01801 	ctz	x1, x0
+  6c:	dac01900 	ctz	x0, x8
+  70:	dac018be 	ctz	x30, x5
+  74:	dac01bc4 	ctz	x4, x30
+  78:	1ac06000 	smax	w0, w0, w0
+  7c:	1ac06001 	smax	w1, w0, w0
+  80:	1ac06020 	smax	w0, w1, w0
+  84:	1ac16000 	smax	w0, w0, w1
+  88:	1ac46043 	smax	w3, w2, w4
+  8c:	1ac0601e 	smax	w30, w0, w0
+  90:	1ac063c0 	smax	w0, w30, w0
+  94:	1ade6000 	smax	w0, w0, w30
+  98:	1adc60ee 	smax	w14, w7, w28
+  9c:	9ac06000 	smax	x0, x0, x0
+  a0:	9ac06001 	smax	x1, x0, x0
+  a4:	9ac06020 	smax	x0, x1, x0
+  a8:	9ac16000 	smax	x0, x0, x1
+  ac:	9ac46043 	smax	x3, x2, x4
+  b0:	9ac0601e 	smax	x30, x0, x0
+  b4:	9ac063c0 	smax	x0, x30, x0
+  b8:	9ade6000 	smax	x0, x0, x30
+  bc:	9adc60ee 	smax	x14, x7, x28
+  c0:	1ac06400 	umax	w0, w0, w0
+  c4:	1ac06401 	umax	w1, w0, w0
+  c8:	1ac06420 	umax	w0, w1, w0
+  cc:	1ac16400 	umax	w0, w0, w1
+  d0:	1ac46443 	umax	w3, w2, w4
+  d4:	1ac0641e 	umax	w30, w0, w0
+  d8:	1ac067c0 	umax	w0, w30, w0
+  dc:	1ade6400 	umax	w0, w0, w30
+  e0:	1adc64ee 	umax	w14, w7, w28
+  e4:	9ac06400 	umax	x0, x0, x0
+  e8:	9ac06401 	umax	x1, x0, x0
+  ec:	9ac06420 	umax	x0, x1, x0
+  f0:	9ac16400 	umax	x0, x0, x1
+  f4:	9ac46443 	umax	x3, x2, x4
+  f8:	9ac0641e 	umax	x30, x0, x0
+  fc:	9ac067c0 	umax	x0, x30, x0
+ 100:	9ade6400 	umax	x0, x0, x30
+ 104:	9adc64ee 	umax	x14, x7, x28
+ 108:	1ac06800 	smin	w0, w0, w0
+ 10c:	1ac06801 	smin	w1, w0, w0
+ 110:	1ac06820 	smin	w0, w1, w0
+ 114:	1ac16800 	smin	w0, w0, w1
+ 118:	1ac46843 	smin	w3, w2, w4
+ 11c:	1ac0681e 	smin	w30, w0, w0
+ 120:	1ac06bc0 	smin	w0, w30, w0
+ 124:	1ade6800 	smin	w0, w0, w30
+ 128:	1adc68ee 	smin	w14, w7, w28
+ 12c:	9ac06800 	smin	x0, x0, x0
+ 130:	9ac06801 	smin	x1, x0, x0
+ 134:	9ac06820 	smin	x0, x1, x0
+ 138:	9ac16800 	smin	x0, x0, x1
+ 13c:	9ac46843 	smin	x3, x2, x4
+ 140:	9ac0681e 	smin	x30, x0, x0
+ 144:	9ac06bc0 	smin	x0, x30, x0
+ 148:	9ade6800 	smin	x0, x0, x30
+ 14c:	9adc68ee 	smin	x14, x7, x28
+ 150:	1ac06c00 	umin	w0, w0, w0
+ 154:	1ac06c01 	umin	w1, w0, w0
+ 158:	1ac06c20 	umin	w0, w1, w0
+ 15c:	1ac16c00 	umin	w0, w0, w1
+ 160:	1ac46c43 	umin	w3, w2, w4
+ 164:	1ac06c1e 	umin	w30, w0, w0
+ 168:	1ac06fc0 	umin	w0, w30, w0
+ 16c:	1ade6c00 	umin	w0, w0, w30
+ 170:	1adc6cee 	umin	w14, w7, w28
+ 174:	9ac06c00 	umin	x0, x0, x0
+ 178:	9ac06c01 	umin	x1, x0, x0
+ 17c:	9ac06c20 	umin	x0, x1, x0
+ 180:	9ac16c00 	umin	x0, x0, x1
+ 184:	9ac46c43 	umin	x3, x2, x4
+ 188:	9ac06c1e 	umin	x30, x0, x0
+ 18c:	9ac06fc0 	umin	x0, x30, x0
+ 190:	9ade6c00 	umin	x0, x0, x30
+ 194:	9adc6cee 	umin	x14, x7, x28
+ 198:	11c00000 	smax	w0, w0, #0
+ 19c:	11c00001 	smax	w1, w0, #0
+ 1a0:	11c00020 	smax	w0, w1, #0
+ 1a4:	11c00400 	smax	w0, w0, #1
+ 1a8:	11c38102 	smax	w2, w8, #-32
+ 1ac:	11c2034d 	smax	w13, w26, #-128
+ 1b0:	11c1fd31 	smax	w17, w9, #127
+ 1b4:	91c00000 	smax	x0, x0, #0
+ 1b8:	91c00001 	smax	x1, x0, #0
+ 1bc:	91c00020 	smax	x0, x1, #0
+ 1c0:	91c00400 	smax	x0, x0, #1
+ 1c4:	91c38102 	smax	x2, x8, #-32
+ 1c8:	91c2034d 	smax	x13, x26, #-128
+ 1cc:	91c1fd31 	smax	x17, x9, #127
+ 1d0:	11c40000 	umax	w0, w0, #0
+ 1d4:	11c40001 	umax	w1, w0, #0
+ 1d8:	11c40020 	umax	w0, w1, #0
+ 1dc:	11c40400 	umax	w0, w0, #1
+ 1e0:	11c48902 	umax	w2, w8, #34
+ 1e4:	11c6034d 	umax	w13, w26, #128
+ 1e8:	11c7fd31 	umax	w17, w9, #255
+ 1ec:	91c40000 	umax	x0, x0, #0
+ 1f0:	91c40001 	umax	x1, x0, #0
+ 1f4:	91c40020 	umax	x0, x1, #0
+ 1f8:	91c40400 	umax	x0, x0, #1
+ 1fc:	91c48902 	umax	x2, x8, #34
+ 200:	91c6034d 	umax	x13, x26, #128
+ 204:	91c7fd31 	umax	x17, x9, #255
+ 208:	11c80000 	smin	w0, w0, #0
+ 20c:	11c80001 	smin	w1, w0, #0
+ 210:	11c80020 	smin	w0, w1, #0
+ 214:	11c80400 	smin	w0, w0, #1
+ 218:	11cb8102 	smin	w2, w8, #-32
+ 21c:	11ca034d 	smin	w13, w26, #-128
+ 220:	11c9fd31 	smin	w17, w9, #127
+ 224:	91c80000 	smin	x0, x0, #0
+ 228:	91c80001 	smin	x1, x0, #0
+ 22c:	91c80020 	smin	x0, x1, #0
+ 230:	91c80400 	smin	x0, x0, #1
+ 234:	91cb8102 	smin	x2, x8, #-32
+ 238:	91ca034d 	smin	x13, x26, #-128
+ 23c:	91c9fd31 	smin	x17, x9, #127
+ 240:	11cc0000 	umin	w0, w0, #0
+ 244:	11cc0001 	umin	w1, w0, #0
+ 248:	11cc0020 	umin	w0, w1, #0
+ 24c:	11cc0400 	umin	w0, w0, #1
+ 250:	11cc8902 	umin	w2, w8, #34
+ 254:	11ce034d 	umin	w13, w26, #128
+ 258:	11cffd31 	umin	w17, w9, #255
+ 25c:	91cc0000 	umin	x0, x0, #0
+ 260:	91cc0001 	umin	x1, x0, #0
+ 264:	91cc0020 	umin	x0, x1, #0
+ 268:	91cc0400 	umin	x0, x0, #1
+ 26c:	91cc8902 	umin	x2, x8, #34
+ 270:	91ce034d 	umin	x13, x26, #128
+ 274:	91cffd31 	umin	x17, x9, #255
diff --git a/gas/testsuite/gas/aarch64/cssc.s b/gas/testsuite/gas/aarch64/cssc.s
new file mode 100644
index 0000000..6ba6b57
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/cssc.s
@@ -0,0 +1,160 @@
+/* Common Short Sequence Compression instructions.  */
+abs w0, w0
+abs w1, w0
+abs w0, w8
+abs w30, w5
+abs w4, w30
+abs x0, x0
+abs x1, x0
+abs x0, x8
+abs x30, x5
+abs x4, x30
+cnt w0, w0
+cnt w1, w0
+cnt w0, w8
+cnt w30, w5
+cnt w4, w30
+cnt x0, x0
+cnt x1, x0
+cnt x0, x8
+cnt x30, x5
+cnt x4, x30
+ctz w0, w0
+ctz w1, w0
+ctz w0, w8
+ctz w30, w5
+ctz w4, w30
+ctz x0, x0
+ctz x1, x0
+ctz x0, x8
+ctz x30, x5
+ctz x4, x30
+smax w0, w0, w0
+smax w1, w0, w0
+smax w0, w1, w0
+smax w0, w0, w1
+smax w3, w2, w4
+smax w30, w0, w0
+smax w0, w30, w0
+smax w0, w0, w30
+smax w14, w7, w28
+smax x0, x0, x0
+smax x1, x0, x0
+smax x0, x1, x0
+smax x0, x0, x1
+smax x3, x2, x4
+smax x30, x0, x0
+smax x0, x30, x0
+smax x0, x0, x30
+smax x14, x7, x28
+umax w0, w0, w0
+umax w1, w0, w0
+umax w0, w1, w0
+umax w0, w0, w1
+umax w3, w2, w4
+umax w30, w0, w0
+umax w0, w30, w0
+umax w0, w0, w30
+umax w14, w7, w28
+umax x0, x0, x0
+umax x1, x0, x0
+umax x0, x1, x0
+umax x0, x0, x1
+umax x3, x2, x4
+umax x30, x0, x0
+umax x0, x30, x0
+umax x0, x0, x30
+umax x14, x7, x28
+smin w0, w0, w0
+smin w1, w0, w0
+smin w0, w1, w0
+smin w0, w0, w1
+smin w3, w2, w4
+smin w30, w0, w0
+smin w0, w30, w0
+smin w0, w0, w30
+smin w14, w7, w28
+smin x0, x0, x0
+smin x1, x0, x0
+smin x0, x1, x0
+smin x0, x0, x1
+smin x3, x2, x4
+smin x30, x0, x0
+smin x0, x30, x0
+smin x0, x0, x30
+smin x14, x7, x28
+umin w0, w0, w0
+umin w1, w0, w0
+umin w0, w1, w0
+umin w0, w0, w1
+umin w3, w2, w4
+umin w30, w0, w0
+umin w0, w30, w0
+umin w0, w0, w30
+umin w14, w7, w28
+umin x0, x0, x0
+umin x1, x0, x0
+umin x0, x1, x0
+umin x0, x0, x1
+umin x3, x2, x4
+umin x30, x0, x0
+umin x0, x30, x0
+umin x0, x0, x30
+umin x14, x7, x28
+smax w0, w0, #0
+smax w1, w0, #0
+smax w0, w1, #0
+smax w0, w0, #1
+smax w2, w8, #-32
+smax w13, w26, #-128
+smax w17, w9, #127
+smax x0, x0, #0
+smax x1, x0, #0
+smax x0, x1, #0
+smax x0, x0, #1
+smax x2, x8, #-32
+smax x13, x26, #-128
+smax x17, x9, #127
+umax w0, w0, #0
+umax w1, w0, #0
+umax w0, w1, #0
+umax w0, w0, #1
+umax w2, w8, #34
+umax w13, w26, #128
+umax w17, w9, #255
+umax x0, x0, #0
+umax x1, x0, #0
+umax x0, x1, #0
+umax x0, x0, #1
+umax x2, x8, #34
+umax x13, x26, #128
+umax x17, x9, #255
+smin w0, w0, #0
+smin w1, w0, #0
+smin w0, w1, #0
+smin w0, w0, #1
+smin w2, w8, #-32
+smin w13, w26, #-128
+smin w17, w9, #127
+smin x0, x0, #0
+smin x1, x0, #0
+smin x0, x1, #0
+smin x0, x0, #1
+smin x2, x8, #-32
+smin x13, x26, #-128
+smin x17, x9, #127
+umin w0, w0, #0
+umin w1, w0, #0
+umin w0, w1, #0
+umin w0, w0, #1
+umin w2, w8, #34
+umin w13, w26, #128
+umin w17, w9, #255
+umin x0, x0, #0
+umin x1, x0, #0
+umin x0, x1, #0
+umin x0, x0, #1
+umin x2, x8, #34
+umin x13, x26, #128
+umin x17, x9, #255
+