third_party/llvm-7.0/llvm/test/CodeGen/X86/tail-merge-after-mbp.mir

# RUN: llc -mtriple=x86_64-linux -run-pass=block-placement -o - %s | FileCheck %s

---
# check loop bb.7 is not merged with bb.10, bb.13
# check loop bb.9 is not merged with bb.12
# CHECK:  bb.2:
# CHECK-NEXT:    successors: %bb.3(0x30000000), %bb.4(0x50000000)
# CHECK:    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg
# CHECK-NEXT:    TEST64rr $rax, $rax
# CHECK-NEXT:    JE_1 %bb.3
# CHECK:  bb.4:
# CHECK-NEXT:    successors: %bb.5(0x30000000), %bb.10(0x50000000)
# CHECK:    CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0
# CHECK-NEXT:    JNE_1 %bb.10
# CHECK:  bb.5:
# CHECK-NEXT:    successors: %bb.6(0x30000000), %bb.7(0x50000000)
# CHECK:    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg
# CHECK-NEXT:    TEST64rr $rax, $rax
# CHECK-NEXT:    JE_1 %bb.6
# CHECK:  bb.7
# CHECK-NEXT:    successors: %bb.8(0x71555555), %bb.10(0x0eaaaaab)
# CHECK:    CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0
# CHECK-NEXT:    JNE_1 %bb.10
# CHECK:  bb.8:
# CHECK-NEXT:    successors: %bb.9(0x04000000), %bb.7(0x7c000000)
# CHECK:    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg
# CHECK-NEXT:    TEST64rr $rax, $rax
# CHECK-NEXT:    JNE_1 %bb.7

name:            foo
body:             |
  bb.0:
    successors: %bb.1(0x40000000), %bb.7(0x40000000)

    TEST8ri $dl, 1, implicit-def $eflags, implicit killed $edx
    JE_1 %bb.7, implicit $eflags

  bb.1:
    successors: %bb.16(0x80000000)

    $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
    JMP_1 %bb.16

  bb.7:
    successors: %bb.8(0x30000000), %bb.9(0x50000000)

    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
    TEST64rr $rax, $rax, implicit-def $eflags
    JNE_1 %bb.9, implicit killed $eflags

  bb.8:
    successors: %bb.16(0x80000000)

    $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
    JMP_1 %bb.16

  bb.9:
    successors: %bb.10(0x30000000), %bb.15(0x50000000)

    CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0, implicit-def $eflags :: (load 8)
    JNE_1 %bb.15, implicit $eflags

  bb.10:
    successors: %bb.11(0x30000000), %bb.12(0x50000000)

    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
    TEST64rr $rax, $rax, implicit-def $eflags
    JNE_1 %bb.12, implicit $eflags

  bb.11:
    successors: %bb.16(0x80000000)

    $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
    JMP_1 %bb.16

  bb.12:
    successors: %bb.13(0x71555555), %bb.15(0x0eaaaaab)

    CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0, implicit-def $eflags :: (load 8), (load 8)
    JNE_1 %bb.15, implicit $eflags

  bb.13:
    successors: %bb.14(0x04000000), %bb.12(0x7c000000)

    $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
    TEST64rr $rax, $rax, implicit-def $eflags
    JNE_1 %bb.12, implicit $eflags

  bb.14:
    successors: %bb.16(0x80000000)

    $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
    JMP_1 %bb.16

  bb.15:
    successors: %bb.16(0x80000000)

    $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
    dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al

  bb.16:

    RETQ $eax

...