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llvm/llvm/test/MC/Disassembler/AArch64/basic-a64-unpredictable.txt 

# RUN: llvm-mc -triple=aarch64 -mattr=+fp-armv8 -disassemble < %s 2>&1 | FileCheck %s
# RUN: llvm-mc -triple=arm64 -mattr=+fp-armv8 -disassemble < %s 2>&1 | FileCheck %s

#------------------------------------------------------------------------------
# Load-store exclusive
#------------------------------------------------------------------------------

#ldxp x14, x14, [sp]
0xee 0x3b 0x7f 0xc8
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0xee 0x3b 0x7f 0xc8

#ldaxp w19, w19, [x1]
0x33 0xcc 0x7f 0x88
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0x33 0xcc 0x7f 0x88

#------------------------------------------------------------------------------
# Load-store register (immediate post-indexed)
#------------------------------------------------------------------------------

0x63 0x44 0x40 0xf8
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0x63 0x44 0x40 0xf8

0x42 0x14 0xc0 0x38
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0x42 0x14 0xc0 0x38

#------------------------------------------------------------------------------
# Load-store register (immediate pre-indexed)
#------------------------------------------------------------------------------

0x63 0x4c 0x40 0xf8
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0x63 0x4c 0x40 0xf8

0x42 0x1c 0xc0 0x38
#CHECK: warning: potentially undefined instruction encoding
#CHECK-NEXT: 0x42 0x1c 0xc0 0x38

#------------------------------------------------------------------------------
# Load-store register pair (offset)
#------------------------------------------------------------------------------

# Unpredictable if Rt == Rt2 on a load.

0xe3 0x0f 0x40 0xa9
# CHECK:  warning: potentially undefined instruction encoding
# CHECK-NEXT: 0xe3 0x0f 0x40 0xa9
# CHECK-NEXT: ^

0xe2 0x8b 0x41 0x69
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0xe2 0x8b 0x41 0x69
# CHECK-NEXT: ^

0x82 0x88 0x40 0x2d
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0x82 0x88 0x40 0x2d
# CHECK-NEXT: ^

#------------------------------------------------------------------------------
# Load-store register pair (post-indexed)
#------------------------------------------------------------------------------

# Unpredictable if Rt == Rt2 on a load.

0xe3 0x0f 0xc0 0xa8
# CHECK:  warning: potentially undefined instruction encoding
# CHECK-NEXT: 0xe3 0x0f 0xc0 0xa8
# CHECK-NEXT: ^

0xe2 0x8b 0xc1 0x68
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0xe2 0x8b 0xc1 0x68
# CHECK-NEXT: ^

0x82 0x88 0xc0 0x2c
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0x82 0x88 0xc0 0x2c
# CHECK-NEXT: ^

# Also unpredictable if writeback clashes with either transfer register

0x63 0x94 0xc0 0xa8
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0x63 0x94 0xc0 0xa8

0x69 0x2d 0x81 0xa8
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0x69 0x2d 0x81 0xa8

0x29 0xad 0xc0 0x28
# CHECK: warning: potentially undefined instruction encoding
# CHECK-NEXT: 0x29 0xad 0xc0 0x28