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Compiler projects using llvm 
# Strip out debug info, then run ldst-opt with limit=1.
# RUN: llc -aarch64-load-store-scan-limit=1 -mtriple=aarch64-none-linux-gnu -mattr=+mte -run-pass mir-strip-debug,aarch64-ldst-opt -mir-strip-debugify-only=0 -verify-machineinstrs  -o - %s | FileCheck %s
#
# Run ldst-opt with limit=1, then strip out debug info.
# RUN: llc -aarch64-load-store-scan-limit=1 -mtriple=aarch64-none-linux-gnu -mattr=+mte -run-pass aarch64-ldst-opt,mir-strip-debug -mir-strip-debugify-only=0 -verify-machineinstrs  -o - %s | FileCheck %s
---

### STG and its offset limits

# CHECK-LABEL: name: test_STG_post
# CHECK: STGPostIndex $x0, $x0, 7
name: test_STG_post
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post_same_reg
# CHECK: STGPostIndex $x1, $x0, 7
name: test_STG_post_same_reg
body: |
  bb.0.entry:
    liveins: $x0, $x1

    STGOffset $x1, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post_unaligned
# CHECK:      STGOffset $x0, $x0, 0
# CHECK-NEXT: ADDXri $x0, 8, 0
name: test_STG_post_unaligned
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 8, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post2
# CHECK: STGPostIndex $x0, $x0, -256
name: test_STG_post2
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = SUBXri $x0, 4096, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post3
# CHECK:      STGOffset $x0, $x0, 0
# CHECK-NEXT: SUBXri $x0, 4112, 0
name: test_STG_post3
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = SUBXri $x0, 4112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post4
# CHECK: STGPostIndex $x0, $x0, 255
name: test_STG_post4
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 4080, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STG_post5
# CHECK:      STGOffset $x0, $x0, 0
# CHECK-NEXT: ADDXri $x0, 4096, 0
name: test_STG_post5
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 4096, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

### The rest of ST*G variants.

# CHECK-LABEL: name: test_STZG_post
# CHECK: STZGPostIndex $x0, $x0, 7
name: test_STZG_post
body: |
  bb.0.entry:
    liveins: $x0

    STZGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_ST2G_post
# CHECK: ST2GPostIndex $x0, $x0, 7
name: test_ST2G_post
body: |
  bb.0.entry:
    liveins: $x0

    ST2GOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STZ2G_post
# CHECK: STZ2GPostIndex $x0, $x0, 7
name: test_STZ2G_post
body: |
  bb.0.entry:
    liveins: $x0

    STZ2GOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

### STGP and its offset limits

# CHECK-LABEL: name: test_STGP_post
# CHECK: STGPpost $x1, $x2, $x0, 7
name: test_STGP_post
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_post2
# CHECK: STGPpost $x1, $x2, $x0, -64
name: test_STGP_post2
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = SUBXri $x0, 1024, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_post3
# CHECK:      STGPi $x1, $x2, $x0, 0
# CHECK-NEXT: SUBXri $x0, 1040, 0
name: test_STGP_post3
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = SUBXri $x0, 1040, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_post4
# CHECK: STGPpost $x1, $x2, $x0, 63
name: test_STGP_post4
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 1008, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_post5
# CHECK:      STGPi $x1, $x2, $x0, 0
# CHECK-NEXT: ADDXri $x0, 1024, 0
name: test_STGP_post5
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 1024, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

### Pre-indexed forms

# CHECK-LABEL: name: test_STG_pre
# CHECK: STGPreIndex $x0, $x0, 10
name: test_STG_pre
body: |
  bb.0.entry:
    liveins: $x0

    STGOffset $x0, $x0, 10
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 160, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_pre
# CHECK: STGPpre $x1, $x2, $x0, 10
name: test_STGP_pre
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    STGPi $x1, $x2, $x0, 10
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 160, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

### Pre-indexed forms with add/sub coming before the store.

# CHECK-LABEL: name: test_STG_pre_back
# CHECK: STGPreIndex $x0, $x0, 2
name: test_STG_pre_back
body: |
  bb.0.entry:
    liveins: $x0

    $x0 = ADDXri $x0, 32, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    STGOffset $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_pre_back
# CHECK: STGPpre $x1, $x2, $x0, -3
name: test_STGP_pre_back
body: |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    $x0 = SUBXri $x0, 48, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    STGPi $x1, $x2, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

### STGP with source register == address register

# CHECK-LABEL: name: test_STGP_post_same_reg
# CHECK: STGPpost $x0, $x0, $x0, 7
name: test_STGP_post_same_reg
body: |
  bb.0.entry:
    liveins: $x0

    STGPi $x0, $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# CHECK-LABEL: name: test_STGP_pre_same_reg
# CHECK: STGPpre $x0, $x0, $x0, 7
name: test_STGP_pre_same_reg
body: |
  bb.0.entry:
    liveins: $x0

    STGPi $x0, $x0, $x0, 7
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    $x0 = ADDXri $x0, 112, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...

# This case can not be merged because the source register is always read before writeback.
# CHECK-LABEL: name: test_STGP_pre_back_same_reg
# CHECK:      SUBXri $x0, 48, 0
# CHECK-NEXT: STGPi $x0, $x0, $x0, 0
name: test_STGP_pre_back_same_reg
body: |
  bb.0.entry:
    liveins: $x0

    $x0 = SUBXri $x0, 48, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    STGPi $x0, $x0, $x0, 0
    DBG_VALUE $x0, 0
    DBG_VALUE $x0, 0
    RET_ReallyLR implicit $x0
...