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Compiler projects using llvm 
# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass greedy -verify-machineinstrs  -o - %s | FileCheck %s
--- |
  define i64 @test_subreg_spill_fold() { ret i64 0 }
  define i64 @test_subreg_spill_fold2() { ret i64 0 }
  define i64 @test_subreg_spill_fold3() { ret i64 0 }
  define i64 @test_subreg_fill_fold() { ret i64 0 }
  define double @test_subreg_fill_fold2() { ret double 0.0 }
  define i64 @test_nzcv_spill_fold() { ret i64 0 }
...
---
# CHECK-LABEL: name: test_subreg_spill_fold
# Ensure that the spilled subreg COPY is eliminated and folded into the spill store.
name:            test_subreg_spill_fold
registers:
  - { id: 0, class: gpr64 }
body:             |
  bb.0:
    ; CHECK: STRXui $xzr, %stack.0, 0 :: (store (s64) into %stack.0)
    undef %0.sub_32 = COPY $wzr
    INLINEASM &nop, 1, 12, implicit-def dead $x0, 12, implicit-def dead $x1, 12, implicit-def dead $x2, 12, implicit-def dead $x3, 12, implicit-def dead $x4, 12, implicit-def dead $x5, 12, implicit-def dead $x6, 12, implicit-def dead $x7, 12, implicit-def dead $x8, 12, implicit-def dead $x9, 12, implicit-def dead $x10, 12, implicit-def dead $x11, 12, implicit-def dead $x12, 12, implicit-def dead $x13, 12, implicit-def dead $x14, 12, implicit-def dead $x15, 12, implicit-def dead $x16, 12, implicit-def dead $x17, 12, implicit-def dead $x18, 12, implicit-def dead $x19, 12, implicit-def dead $x20, 12, implicit-def dead $x21, 12, implicit-def dead $x22, 12, implicit-def dead $x23, 12, implicit-def dead $x24, 12, implicit-def dead $x25, 12, implicit-def dead $x26, 12, implicit-def dead $x27, 12, implicit-def dead $x28, 12, implicit-def dead $fp, 12, implicit-def dead $lr, 12, implicit-def $sp
    $x0 = COPY %0
    RET_ReallyLR implicit $x0
...
---
# CHECK-LABEL: name: test_subreg_spill_fold2
# Similar to test_subreg_spill_fold, but with a %0 register class not containing %WZR.
name:            test_subreg_spill_fold2
registers:
  - { id: 0, class: gpr64sp }
body:             |
  bb.0:
    ; CHECK: STRXui $xzr, %stack.0, 0 :: (store (s64) into %stack.0)
    undef %0.sub_32 = COPY $wzr
    INLINEASM &nop, 1, 12, implicit-def dead $x0, 12, implicit-def dead $x1, 12, implicit-def dead $x2, 12, implicit-def dead $x3, 12, implicit-def dead $x4, 12, implicit-def dead $x5, 12, implicit-def dead $x6, 12, implicit-def dead $x7, 12, implicit-def dead $x8, 12, implicit-def dead $x9, 12, implicit-def dead $x10, 12, implicit-def dead $x11, 12, implicit-def dead $x12, 12, implicit-def dead $x13, 12, implicit-def dead $x14, 12, implicit-def dead $x15, 12, implicit-def dead $x16, 12, implicit-def dead $x17, 12, implicit-def dead $x18, 12, implicit-def dead $x19, 12, implicit-def dead $x20, 12, implicit-def dead $x21, 12, implicit-def dead $x22, 12, implicit-def dead $x23, 12, implicit-def dead $x24, 12, implicit-def dead $x25, 12, implicit-def dead $x26, 12, implicit-def dead $x27, 12, implicit-def dead $x28, 12, implicit-def dead $fp, 12, implicit-def dead $lr, 12, implicit-def $sp
    $x0 = ADDXri %0, 1, 0
    RET_ReallyLR implicit $x0
...
---
# CHECK-LABEL: name: test_subreg_spill_fold3
# Similar to test_subreg_spill_fold, but with a cross register class copy.
name:            test_subreg_spill_fold3
registers:
  - { id: 0, class: fpr64 }
body:             |
  bb.0:
    ; CHECK: STRXui $xzr, %stack.0, 0 :: (store (s64) into %stack.0)
    undef %0.ssub = COPY $wzr
    INLINEASM &nop, 1, 12, implicit-def dead $d0, 12, implicit-def dead $d1, 12, implicit-def dead $d2, 12, implicit-def dead $d3, 12, implicit-def dead $d4, 12, implicit-def dead $d5, 12, implicit-def dead $d6, 12, implicit-def dead $d7, 12, implicit-def dead $d8, 12, implicit-def dead $d9, 12, implicit-def dead $d10, 12, implicit-def dead $d11, 12, implicit-def dead $d12, 12, implicit-def dead $d13, 12, implicit-def dead $d14, 12, implicit-def dead $d15, 12, implicit-def dead $d16, 12, implicit-def dead $d17, 12, implicit-def dead $d18, 12, implicit-def dead $d19, 12, implicit-def dead $d20, 12, implicit-def dead $d21, 12, implicit-def dead $d22, 12, implicit-def dead $d23, 12, implicit-def dead $d24, 12, implicit-def dead $d25, 12, implicit-def dead $d26, 12, implicit-def dead $d27, 12, implicit-def dead $d28, 12, implicit-def dead $d29, 12, implicit-def dead $d30, 12, implicit-def $d31
    $x0 = COPY %0
    RET_ReallyLR implicit $x0
...
---
# CHECK-LABEL: name: test_subreg_fill_fold
# Ensure that the filled COPY is eliminated and folded into the fill load.
name:            test_subreg_fill_fold
registers:
  - { id: 0, class: gpr32 }
  - { id: 1, class: gpr64 }
body:             |
  bb.0:
    %0 = COPY $wzr
    INLINEASM &nop, 1, 12, implicit-def dead $x0, 12, implicit-def dead $x1, 12, implicit-def dead $x2, 12, implicit-def dead $x3, 12, implicit-def dead $x4, 12, implicit-def dead $x5, 12, implicit-def dead $x6, 12, implicit-def dead $x7, 12, implicit-def dead $x8, 12, implicit-def dead $x9, 12, implicit-def dead $x10, 12, implicit-def dead $x11, 12, implicit-def dead $x12, 12, implicit-def dead $x13, 12, implicit-def dead $x14, 12, implicit-def dead $x15, 12, implicit-def dead $x16, 12, implicit-def dead $x17, 12, implicit-def dead $x18, 12, implicit-def dead $x19, 12, implicit-def dead $x20, 12, implicit-def dead $x21, 12, implicit-def dead $x22, 12, implicit-def dead $x23, 12, implicit-def dead $x24, 12, implicit-def dead $x25, 12, implicit-def dead $x26, 12, implicit-def dead $x27, 12, implicit-def dead $x28, 12, implicit-def dead $fp, 12, implicit-def dead $lr, 12, implicit-def $sp
    ; CHECK: undef %1.sub_32:gpr64 = LDRWui %stack.0, 0 :: (load (s32) from %stack.0)
    undef %1.sub_32 = COPY %0
    $x0 = COPY %1
    RET_ReallyLR implicit $x0
...
---
# CHECK-LABEL: name: test_subreg_fill_fold2
# Similar to test_subreg_fill_fold, but with a cross-class copy.
name:            test_subreg_fill_fold2
registers:
  - { id: 0, class: gpr32 }
  - { id: 1, class: fpr64 }
body:             |
  bb.0:
    %0 = COPY $wzr
    INLINEASM &nop, 1, 12, implicit-def dead $x0, 12, implicit-def dead $x1, 12, implicit-def dead $x2, 12, implicit-def dead $x3, 12, implicit-def dead $x4, 12, implicit-def dead $x5, 12, implicit-def dead $x6, 12, implicit-def dead $x7, 12, implicit-def dead $x8, 12, implicit-def dead $x9, 12, implicit-def dead $x10, 12, implicit-def dead $x11, 12, implicit-def dead $x12, 12, implicit-def dead $x13, 12, implicit-def dead $x14, 12, implicit-def dead $x15, 12, implicit-def dead $x16, 12, implicit-def dead $x17, 12, implicit-def dead $x18, 12, implicit-def dead $x19, 12, implicit-def dead $x20, 12, implicit-def dead $x21, 12, implicit-def dead $x22, 12, implicit-def dead $x23, 12, implicit-def dead $x24, 12, implicit-def dead $x25, 12, implicit-def dead $x26, 12, implicit-def dead $x27, 12, implicit-def dead $x28, 12, implicit-def dead $fp, 12, implicit-def dead $lr, 12, implicit-def $sp
    ; CHECK: undef %1.ssub:fpr64 = LDRSui %stack.0, 0 :: (load (s32) from %stack.0)
    undef %1.ssub = COPY %0
    $d0 = COPY %1
    RET_ReallyLR implicit $d0
...
---
# CHECK-LABEL: name: test_nzcv_spill_fold
# Ensure that nzcv COPY cannot be folded.
name:            test_nzcv_spill_fold
registers:
  - { id: 0, class: gpr64 }
body:             |
  bb.0:
    ; CHECK: %1:gpr64 = COPY $nzcv
    ; CHECK: STRXui %1, %stack.0, 0 :: (store (s64) into %stack.0)
    %0 = COPY $nzcv
    INLINEASM &nop, 1, 12, implicit-def dead $x0, 12, implicit-def dead $x1, 12, implicit-def dead $x2, 12, implicit-def dead $x3, 12, implicit-def dead $x4, 12, implicit-def dead $x5, 12, implicit-def dead $x6, 12, implicit-def dead $x7, 12, implicit-def dead $x8, 12, implicit-def dead $x9, 12, implicit-def dead $x10, 12, implicit-def dead $x11, 12, implicit-def dead $x12, 12, implicit-def dead $x13, 12, implicit-def dead $x14, 12, implicit-def dead $x15, 12, implicit-def dead $x16, 12, implicit-def dead $x17, 12, implicit-def dead $x18, 12, implicit-def dead $x19, 12, implicit-def dead $x20, 12, implicit-def dead $x21, 12, implicit-def dead $x22, 12, implicit-def dead $x23, 12, implicit-def dead $x24, 12, implicit-def dead $x25, 12, implicit-def dead $x26, 12, implicit-def dead $x27, 12, implicit-def dead $x28, 12, implicit-def dead $fp, 12, implicit-def dead $lr, 12, implicit-def $sp
    $x0 = COPY %0
    RET_ReallyLR implicit $x0
...