test/CodeGen/X86/implicit-null-checks.mir

# RUN: llc -run-pass implicit-null-checks -mtriple=x86_64-apple-macosx -o - %s | FileCheck %s

--- |
  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
  target triple = "x86_64-apple-macosx"

  ;; Positive test
  define i32 @imp_null_check_with_bitwise_op_0(i32* %x, i32 %val) {
  entry:
    br i1 undef, label %is_null, label %not_null, !make.implicit !0

  is_null:
    ret i32 42

  not_null:
    br i1 undef, label %ret_100, label %ret_200

  ret_100:
    ret i32 100

  ret_200:
    ret i32 200
  }

  ;; Negative test.  The regalloc is such that we cannot hoist the
  ;; instruction materializing 2200000 into %eax
  define i32 @imp_null_check_with_bitwise_op_1(i32* %x, i32 %val, i32* %ptr) {
  entry:
    br i1 undef, label %is_null, label %not_null, !make.implicit !0

  is_null:
    ret i32 undef

  not_null:
    br i1 undef, label %ret_100, label %ret_200

  ret_100:
    ret i32 100

  ret_200:
    ret i32 200
  }

  ;; Negative test: IR is identical to
  ;; @imp_null_check_with_bitwise_op_0 but MIR differs.
  define i32 @imp_null_check_with_bitwise_op_2(i32* %x, i32 %val) {
  entry:
    br i1 undef, label %is_null, label %not_null, !make.implicit !0

  is_null:
    ret i32 42

  not_null:
    br i1 undef, label %ret_100, label %ret_200

  ret_100:
    ret i32 100

  ret_200:
    ret i32 200
  }

  ;; Negative test: IR is identical to
  ;; @imp_null_check_with_bitwise_op_0 but MIR differs.
  define i32 @imp_null_check_with_bitwise_op_3(i32* %x, i32 %val) {
  entry:
    br i1 undef, label %is_null, label %not_null, !make.implicit !0

  is_null:
    ret i32 42

  not_null:
    br i1 undef, label %ret_100, label %ret_200

  ret_100:
    ret i32 100

  ret_200:
    ret i32 200
  }

  !0 = !{}
...
---
name:            imp_null_check_with_bitwise_op_0
# CHECK-LABEL: name:            imp_null_check_with_bitwise_op_0
alignment:       4
allVRegsAllocated: true
tracksRegLiveness: true
tracksSubRegLiveness: false
liveins:
  - { reg: '%rdi' }
  - { reg: '%esi' }
# CHECK:  bb.0.entry:
# CHECK:    %eax = MOV32ri 2200000
# CHECK-NEXT:    %eax = FAULTING_LOAD_OP %bb.3.is_null, {{[0-9]+}}, killed %eax, killed %rdi, 1, _, 0, _, implicit-def dead %eflags :: (load 4 from %ir.x)
# CHECK-NEXT:    JMP_1 %bb.1.not_null

body:             |
  bb.0.entry:
    successors: %bb.3.is_null, %bb.1.not_null
    liveins: %esi, %rdi

    TEST64rr %rdi, %rdi, implicit-def %eflags
    JE_1 %bb.3.is_null, implicit %eflags

  bb.1.not_null:
    successors: %bb.4.ret_100, %bb.2.ret_200
    liveins: %esi, %rdi

    %eax = MOV32ri 2200000
    %eax = AND32rm killed %eax, killed %rdi, 1, _, 0, _, implicit-def dead %eflags :: (load 4 from %ir.x)
    CMP32rr killed %eax, killed %esi, implicit-def %eflags
    JE_1 %bb.4.ret_100, implicit %eflags

  bb.2.ret_200:
    %eax = MOV32ri 200
    RET 0, %eax

  bb.3.is_null:
    %eax = MOV32ri 42
    RET 0, %eax

  bb.4.ret_100:
    %eax = MOV32ri 100
    RET 0, %eax

...
---
name:            imp_null_check_with_bitwise_op_1
alignment:       4
allVRegsAllocated: true
isSSA:           false
tracksRegLiveness: true
tracksSubRegLiveness: false
liveins:
  - { reg: '%rdi' }
  - { reg: '%esi' }
  - { reg: '%rdx' }
# CHECK: bb.0.entry:
# CHECK:    %eax = MOV32rm killed %rdx, 1, _, 0, _ :: (volatile load 4 from %ir.ptr)
# CHECK-NEXT:    TEST64rr %rdi, %rdi, implicit-def %eflags
# CHECK-NEXT:    JE_1 %bb.3.is_null, implicit %eflags

body:             |
  bb.0.entry:
    successors: %bb.3.is_null, %bb.1.not_null
    liveins: %esi, %rdi, %rdx

    %eax = MOV32rm killed %rdx, 1, _, 0, _ :: (volatile load 4 from %ir.ptr)
    TEST64rr %rdi, %rdi, implicit-def %eflags
    JE_1 %bb.3.is_null, implicit %eflags

  bb.1.not_null:
    successors: %bb.4.ret_100, %bb.2.ret_200
    liveins: %esi, %rdi

    %eax = MOV32ri 2200000
    %eax = AND32rm killed %eax, killed %rdi, 1, _, 0, _, implicit-def dead %eflags :: (load 4 from %ir.x)
    CMP32rr killed %eax, killed %esi, implicit-def %eflags
    JE_1 %bb.4.ret_100, implicit %eflags

  bb.2.ret_200:
    successors: %bb.3.is_null

    %eax = MOV32ri 200

  bb.3.is_null:
    liveins: %eax, %ah, %al, %ax, %bh, %bl, %bp, %bpl, %bx, %eax, %ebp, %ebx, %rax, %rbp, %rbx, %r12, %r13, %r14, %r15, %r12b, %r13b, %r14b, %r15b, %r12d, %r13d, %r14d, %r15d, %r12w, %r13w, %r14w, %r15w

    RET 0, %eax

  bb.4.ret_100:
    %eax = MOV32ri 100
    RET 0, %eax

...
---
name:            imp_null_check_with_bitwise_op_2
# CHECK-LABEL: name:            imp_null_check_with_bitwise_op_2
alignment:       4
allVRegsAllocated: true
tracksRegLiveness: true
tracksSubRegLiveness: false
liveins:
  - { reg: '%rdi' }
  - { reg: '%esi' }
# CHECK:  bb.0.entry:
# CHECK:    TEST64rr %rdi, %rdi, implicit-def %eflags
# CHECK-NEXT:    JE_1 %bb.3.is_null, implicit %eflags

body:             |
  bb.0.entry:
    successors: %bb.3.is_null, %bb.1.not_null
    liveins: %esi, %rdi

    TEST64rr %rdi, %rdi, implicit-def %eflags
    JE_1 %bb.3.is_null, implicit %eflags

  bb.1.not_null:
    successors: %bb.4.ret_100, %bb.2.ret_200
    liveins: %esi, %rdi

    %eax = MOV32ri 2200000
    %eax = ADD32ri killed %eax, 100, implicit-def dead %eflags
    %eax = AND32rm killed %eax, killed %rdi, 1, _, 0, _, implicit-def dead %eflags :: (load 4 from %ir.x)
    CMP32rr killed %eax, killed %esi, implicit-def %eflags
    JE_1 %bb.4.ret_100, implicit %eflags

  bb.2.ret_200:
    %eax = MOV32ri 200
    RET 0, %eax

  bb.3.is_null:
    %eax = MOV32ri 42
    RET 0, %eax

  bb.4.ret_100:
    %eax = MOV32ri 100
    RET 0, %eax

...
---
name:            imp_null_check_with_bitwise_op_3
# CHECK-LABEL: name:            imp_null_check_with_bitwise_op_3
alignment:       4
allVRegsAllocated: true
tracksRegLiveness: true
tracksSubRegLiveness: false
liveins:
  - { reg: '%rdi' }
  - { reg: '%rsi' }
# CHECK:  bb.0.entry:
# CHECK:    TEST64rr %rdi, %rdi, implicit-def %eflags
# CHECK-NEXT:    JE_1 %bb.3.is_null, implicit %eflags

body:             |
  bb.0.entry:
    successors: %bb.3.is_null, %bb.1.not_null
    liveins: %rsi, %rdi

    TEST64rr %rdi, %rdi, implicit-def %eflags
    JE_1 %bb.3.is_null, implicit %eflags

  bb.1.not_null:
    successors: %bb.4.ret_100, %bb.2.ret_200
    liveins: %rsi, %rdi

    %rdi  = MOV64ri 5000
    %rdi = AND64rm killed %rdi, killed %rdi, 1, _, 0, _, implicit-def dead %eflags :: (load 4 from %ir.x)
    CMP64rr killed %rdi, killed %rsi, implicit-def %eflags
    JE_1 %bb.4.ret_100, implicit %eflags

  bb.2.ret_200:
    %eax = MOV32ri 200
    RET 0, %eax

  bb.3.is_null:
    %eax = MOV32ri 42
    RET 0, %eax

  bb.4.ret_100:
    %eax = MOV32ri 100
    RET 0, %eax

...