[AArch64] paci<k>171615 auti<k>171615 assembly (#76227)

This adds the following instructions which are added in PAuthLR:
 - PACIA171615
 - PACIB171615
 - AUTIA171615
 - AUTIB171615

Also updates some encodings to match final published values.

Documentation can be found here:

https://developer.arm.com/documentation/ddi0602/2023-12/Base-Instructions

Co-authored-by: Lucas Prates <[email protected]>

Author: tmatheson-arm

llvm/lib/Target/AArch64/AArch64InstrInfo.td

@@ -1671,6 +1671,11 @@ let Predicates = [HasPAuthLR] in {
     //                              opcode2, opcode,   asm
     def AUTIASPPCr : SignAuthOneReg<0b00001, 0b100100, "autiasppc">;
     def AUTIBSPPCr : SignAuthOneReg<0b00001, 0b100101, "autibsppc">;
+    //                                  opcode2, opcode,   asm
+    def PACIA171615 : SignAuthFixedRegs<0b00001, 0b100010, "pacia171615">;
+    def PACIB171615 : SignAuthFixedRegs<0b00001, 0b100011, "pacib171615">;
+    def AUTIA171615 : SignAuthFixedRegs<0b00001, 0b101110, "autia171615">;
+    def AUTIB171615 : SignAuthFixedRegs<0b00001, 0b101111, "autib171615">;
   }
 
   let Uses = [LR, SP], isReturn = 1, isTerminator = 1, isBarrier = 1 in {

llvm/test/MC/AArch64/armv9.5a-pauthlr.s

@@ -98,33 +98,60 @@ label1:
 // CHECK-ERROR: instruction requires: pauth-lr
 // CHECK-UNKNOWN: dac197fe <unknown>
 
+  pacia171615
+// CHECK-INST: pacia171615
+// CHECK-DISASS: pacia171615
+// CHECK-ENCODING: [0xfe,0x8b,0xc1,0xda]
+// CHECK-ERROR: instruction requires: pauth-lr
+// CHECK-UNKNOWN: dac18bfe <unknown>
+
+  pacib171615
+// CHECK-INST: pacib171615
+// CHECK-DISASS: pacib171615
+// CHECK-ENCODING: [0xfe,0x8f,0xc1,0xda]
+// CHECK-ERROR: instruction requires: pauth-lr
+// CHECK-UNKNOWN: dac18ffe <unknown>
+
+  autia171615
+// CHECK-INST: autia171615
+// CHECK-DISASS: autia171615
+// CHECK-ENCODING: [0xfe,0xbb,0xc1,0xda]
+// CHECK-ERROR: instruction requires: pauth-lr
+// CHECK-UNKNOWN: dac1bbfe <unknown>
+
+  autib171615
+// CHECK-INST: autib171615
+// CHECK-DISASS: autib171615
+// CHECK-ENCODING: [0xfe,0xbf,0xc1,0xda]
+// CHECK-ERROR: instruction requires: pauth-lr
+// CHECK-UNKNOWN: dac1bffe <unknown>
 
   retaasppc label1
 // CHECK-INST: retaasppc label1
 // CHECK-DISASS: retaasppc 0x4 <label1>
 // CHECK-ENCODING: [0bAAA11111,A,0b000AAAAA,0x55]
 // CHECK-ENCODING: //   fixup A - offset: 0, value: label1, kind: fixup_aarch64_pcrel_branch16
 // CHECK-ERROR: instruction requires: pauth-lr
-// CHECK-UNKNOWN: 5500019f <unknown>
+// CHECK-UNKNOWN: 5500021f <unknown>
 
   retabsppc label1
 // CHECK-INST: retabsppc label1
 // CHECK-DISASS: retabsppc 0x4 <label1>
 // CHECK-ENCODING: [0bAAA11111,A,0b001AAAAA,0x55]
 // CHECK-ENCODING: //   fixup A - offset: 0, value: label1, kind: fixup_aarch64_pcrel_branch16
 // CHECK-ERROR: instruction requires: pauth-lr
-// CHECK-UNKNOWN: 552001bf <unknown>
+// CHECK-UNKNOWN: 5520023f <unknown>
 
   retaasppc #0
 // CHECK-INST: retaasppc #0
-// CHECK-DISASS: retaasppc 0x3c <label1+0x38>
+// CHECK-DISASS: retaasppc 0x4c <label1+0x48>
 // CHECK-ENCODING: [0x1f,0x00,0x00,0x55]
 // CHECK-ERROR: instruction requires: pauth-lr
 // CHECK-UNKNOWN: 5500001f <unknown>
 
   retaasppc #-(1<<18)+4
 // CHECK-INST: retaasppc #-262140
-// CHECK-DISASS: retaasppc 0xfffffffffffc0044 <label1+0xfffffffffffc0040>
+// CHECK-DISASS: retaasppc 0xfffffffffffc0054 <label1+0xfffffffffffc0050>
 // CHECK-ENCODING: [0xff,0xff,0x1f,0x55]
 // CHECK-ERROR: instruction requires: pauth-lr
 // CHECK-UNKNOWN: 551fffff <unknown>

llvm/test/MC/Disassembler/AArch64/armv9.5a-pauthlr.txt

@@ -49,6 +49,22 @@
 # CHECK: autibsppc xzr
 # NO-PAUTHLR: invalid instruction encoding
 
+[0xfe,0x8b,0xc1,0xda]
+# CHECK: pacia171615
+# NO-PAUTHLR: invalid instruction encoding
+
+[0xfe,0x8f,0xc1,0xda]
+# CHECK: pacib171615
+# NO-PAUTHLR: invalid instruction encoding
+
+[0xfe,0xbb,0xc1,0xda]
+# CHECK: autia171615
+# NO-PAUTHLR: invalid instruction encoding
+
+[0xfe,0xbf,0xc1,0xda]
+# CHECK: autib171615
+# NO-PAUTHLR: invalid instruction encoding
+
 [0xbf,0x01,0x00,0x55]
 # CHECK: retaasppc #-52
 # NO-PAUTHLR: invalid instruction encoding