test/CodeGen/AArch64/aarch64-ldst-subsuperReg-no-ldp.mir

# RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -run-pass=aarch64-ldst-opt %s -o - | FileCheck %s
#
# The test below tests that when the AArch64 Load Store Optimization pass tries to
# convert load instructions into a ldp instruction, and when the destination
# registers are sub/super register of each other, then the convertion should not occur.
#
# For example, for the following pattern:
#     ldr x10 [x9]
#     ldr w10 [x9, 8],
# We cannot convert it to an ldp instruction.
#
# CHECK-NOT: LDP
# CHECK: $x10 = LDRSWui $x9, 0
# CHECK: $w10 = LDRWui $x9, 1
# CHECK: RET
---
name:            test1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x9
    $x10 = LDRSWui $x9, 0 :: (load 4)
    $w10 = LDRWui $x9, 1 :: (load 4)
    RET undef $lr, implicit undef $w0
...
# CHECK-NOT: LDP
# CHECK: $w10 = LDRWui $x9, 0
# CHECK: $x10 = LDRSWui $x9, 1
# CHECK: RET
---
name:            test2
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x9
    $w10 = LDRWui $x9, 0 :: (load 4)
    $x10 = LDRSWui $x9, 1 :: (load 4)
    RET undef $lr, implicit undef $w0
...