test/CodeGen/MIR/AArch64/spill-fold.mir

# 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 }
...
---
# 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 8 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 vreg0 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 8 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 8 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 = LDRWui %stack.0, 0 :: (load 4 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 = LDRSui %stack.0, 0 :: (load 4 from %stack.0)
    undef %1.ssub = COPY %0
    %d0 = COPY %1
    RET_ReallyLR implicit %d0
...