llvm/test/CodeGen/X86/peep-test-5.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -o - %s -mtriple=x86_64-- | FileCheck %s
; Example of a decref operation with "immortal" objects.
; void decref(long* refcount) {
;  long count = *refcount;
;  if (count == 1) { free_object() }
;  else if (count > 1) { *refcount = count - 1; }
;  else { /* immortal */ }
; }
; Resulting assembly should share flags from single CMP instruction for both
; conditions!
define void @decref(ptr %p) {
; CHECK-LABEL: decref:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movl (%rdi), %eax
; CHECK-NEXT:    cmpl $1, %eax
; CHECK-NEXT:    jne .LBB0_2
; CHECK-NEXT:  # %bb.1: # %bb_free
; CHECK-NEXT:    pushq %rax
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    callq free_object@PLT
; CHECK-NEXT:    addq $8, %rsp
; CHECK-NEXT:    .cfi_def_cfa_offset 8
; CHECK-NEXT:  .LBB0_4: # %end
; CHECK-NEXT:    retq
; CHECK-NEXT:  .LBB0_2: # %bb2
; CHECK-NEXT:    jle .LBB0_4
; CHECK-NEXT:  # %bb.3: # %bb_dec
; CHECK-NEXT:    decl %eax
; CHECK-NEXT:    movl %eax, (%rdi)
; CHECK-NEXT:    retq
  %count = load i32, ptr %p, align 4
  %cmp0 = icmp eq i32 %count, 1
  br i1 %cmp0, label %bb_free, label %bb2

bb2:
  %cmp1 = icmp sgt i32 %count, 1
  br i1 %cmp1, label %bb_dec, label %end

bb_dec:
  %dec = add nsw i32 %count, -1
  store i32 %dec, ptr %p, align 4
  br label %end

bb_free:
  call void @free_object()
  br label %end

end:
  ret void
}

declare void @free_object()

; Check TEST instruction would not be combined with CMP.
define i1 @pr155586(i8 %0) {
; CHECK-LABEL: pr155586:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    cmpb $1, %dil
; CHECK-NEXT:    setne %cl
; CHECK-NEXT:    testb $1, %dil
; CHECK-NEXT:    sete %al
; CHECK-NEXT:    andb %cl, %al
; CHECK-NEXT:    retq
entry:
  %cmp88.not = icmp eq i8 %0, 1
  %1 = and i8 %0, 1
  %tobool161.not = icmp eq i8 %1, 0
  %common.ret.op = select i1 %cmp88.not, i1 false, i1 %tobool161.not
  ret i1 %common.ret.op
}

; Check TEST8rr instruction would not be combined with TEST8ri.
define i32 @pr155828() {
; CHECK-LABEL: pr155828:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    xorl %eax, %eax
; CHECK-NEXT:    .p2align 4
; CHECK-NEXT:  .LBB2_1: # %func_188.exit.i.i
; CHECK-NEXT:    # =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    movl %eax, %ecx
; CHECK-NEXT:    movl $1, %eax
; CHECK-NEXT:    testb $1, %cl
; CHECK-NEXT:    jne .LBB2_1
; CHECK-NEXT:  # %bb.2: # %if.else.i.i.i
; CHECK-NEXT:    xorl %eax, %eax
; CHECK-NEXT:    testb %cl, %cl
; CHECK-NEXT:    setg %al
; CHECK-NEXT:    retq
entry:
  br label %func_188.exit.i.i

func_188.exit.i.i:                                ; preds = %func_188.exit.i.i, %entry
  %or659.i167180.i.i = phi i32 [ 0, %entry ], [ 1, %func_188.exit.i.i ]
  %conv48.i.i = trunc i32 %or659.i167180.i.i to i8
  %and.i.i.i = and i32 %or659.i167180.i.i, 1
  %tobool80.not.i.i.i = icmp eq i32 %and.i.i.i, 0
  br i1 %tobool80.not.i.i.i, label %if.else.i.i.i, label %func_188.exit.i.i

if.else.i.i.i:                                    ; preds = %func_188.exit.i.i
  %cmp183.i.i.i = icmp sgt i8 %conv48.i.i, 0
  %ext = zext i1 %cmp183.i.i.i to i32
  ret i32 %ext
}