Add feature flag tests for the cmpbr instructions

Author: CarolineConcatto

llvm/lib/Target/AArch64/AArch64InstrFormats.td

@@ -12661,7 +12661,7 @@ class MulAccumCPA<bit isSub, string asm>
 
 
 //----------------------------------------------------------------------------
-// 2023 Armv9.6 Extensions
+// 2024 Armv9.6 Extensions
 //----------------------------------------------------------------------------
 
 //---

llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

@@ -3751,6 +3751,7 @@ static const struct Extension {
     {"sme-fa64", {AArch64::FeatureSMEFA64}},
     {"cpa", {AArch64::FeatureCPA}},
     {"tlbiw", {AArch64::FeatureTLBIW}},
+    {"cmpbr", {AArch64::FeatureCMPBR}},
 };
 
 static void setRequiredFeatureString(FeatureBitset FBS, std::string &Str) {

llvm/test/MC/AArch64/directive-arch-negative.s

@@ -56,3 +56,8 @@
 
 # CHECK: error: instruction requires: lse
 # CHECK-NEXT:   casa  w5, w7, [x20]
+
+	.arch arm9.6-a-nocmpbr
+        cbhi x5, x5, #1020
+# CHECK: error: instruction requires: cmpbr
+# CHECK-NEXT:   cbhi x5, x5, #1020

llvm/test/MC/AArch64/directive-arch.s

@@ -21,3 +21,8 @@
 	mrs   x0, rndrrs
 # CHECK:        mrs     x0, RNDR
 # CHECK:        mrs     x0, RNDRRS
+
+	.arch armv9-a+cmpbr
+	cbne x5, #31, lbl
+# CHECK:        cbne x5, #31, lbl
+

llvm/test/MC/AArch64/directive-arch_extension-negative.s

@@ -1,6 +1,6 @@
 // RUN: not llvm-mc -triple aarch64 \
 // RUN: -mattr=+crc,+sm4,+sha3,+sha2,+aes,+fp,+neon,+ras,+lse,+predres,+ccdp,+mte,+tlb-rmi,+pan-rwv,+ccpp,+rcpc,+ls64,+flagm,+hbc,+mops \
-// RUN: -mattr=+rcpc3,+lse128,+d128,+the,+rasv2,+ite,+cssc,+specres2,+gcs \
+// RUN: -mattr=+rcpc3,+lse128,+d128,+the,+rasv2,+ite,+cssc,+specres2,+gcs,+cmpbr \
 // RUN: -filetype asm -o - %s 2>&1 | FileCheck %s
 
 .arch_extension axp64
@@ -229,3 +229,11 @@ gcspushm x0
 gcspushm x0
 // CHECK: [[@LINE-1]]:1: error: instruction requires: gcs
 // CHECK-NEXT: gcspushm x0
+
+cbhi x5, x5, #1020
+// CHECK-NOT: [[@LINE-1]]:1: error: instruction requires: cmpbr
+.arch_extension nocmpbr
+cbhi x5, x5, #1020
+// CHECK: [[@LINE-1]]:1: error: instruction requires: cmpbr
+// CHECK-NEXT: cbhi x5, x5, #1020
+