llvm/test/CodeGen/X86/x86-shrink-wrapping.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc %s -o - -enable-shrink-wrap=true -pass-remarks-output=%t -disable-cgp-delete-phis | FileCheck %s --check-prefix=ENABLE
; RUN: cat %t | FileCheck %s --check-prefix=REMARKS
; RUN: llc %s -o - -enable-shrink-wrap=false -disable-cgp-delete-phis | FileCheck %s --check-prefix=DISABLE
;
; Note: Lots of tests use inline asm instead of regular calls.
; This allows to have a better control on what the allocation will do.
; Otherwise, we may have spill right in the entry block, defeating
; shrink-wrapping. Moreover, some of the inline asm statement (nop)
; are here to ensure that the related paths do not end up as critical
; edges.
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "x86_64-apple-macosx"


; Initial motivating example: Simple diamond with a call just on one side.
define i32 @foo(i32 %a, i32 %b) {
; ENABLE-LABEL: foo:
; ENABLE:       ## %bb.0:
; ENABLE-NEXT:    movl %edi, %eax
; ENABLE-NEXT:    cmpl %esi, %edi
; ENABLE-NEXT:    jge LBB0_2
; ENABLE-NEXT:  ## %bb.1: ## %true
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    movl %eax, {{[0-9]+}}(%rsp)
; ENABLE-NEXT:    leaq {{[0-9]+}}(%rsp), %rsi
; ENABLE-NEXT:    xorl %edi, %edi
; ENABLE-NEXT:    callq _doSomething
; ENABLE-NEXT:    addq $8, %rsp
; ENABLE-NEXT:  LBB0_2: ## %false
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: foo:
; DISABLE:       ## %bb.0:
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    movl %edi, %eax
; DISABLE-NEXT:    cmpl %esi, %edi
; DISABLE-NEXT:    jge LBB0_2
; DISABLE-NEXT:  ## %bb.1: ## %true
; DISABLE-NEXT:    movl %eax, {{[0-9]+}}(%rsp)
; DISABLE-NEXT:    leaq {{[0-9]+}}(%rsp), %rsi
; DISABLE-NEXT:    xorl %edi, %edi
; DISABLE-NEXT:    callq _doSomething
; DISABLE-NEXT:  LBB0_2: ## %false
; DISABLE-NEXT:    popq %rcx
; DISABLE-NEXT:    retq
  %tmp = alloca i32, align 4
  %tmp2 = icmp slt i32 %a, %b
  br i1 %tmp2, label %true, label %false

true:
  store i32 %a, ptr %tmp, align 4
  %tmp4 = call i32 @doSomething(i32 0, ptr %tmp)
  br label %false

false:
  %tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
  ret i32 %tmp.0
}

; Function Attrs: optsize
declare i32 @doSomething(i32, ptr)


; Check that we do not perform the restore inside the loop whereas the save
; is outside.
define i32 @freqSaveAndRestoreOutsideLoop(i32 %cond, i32 %N) {
; ENABLE-LABEL: freqSaveAndRestoreOutsideLoop:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testl %edi, %edi
; ENABLE-NEXT:    je LBB1_4
; ENABLE-NEXT:  ## %bb.1: ## %for.preheader
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbx, -16
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    movl $10, %ecx
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB1_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    addl %edx, %eax
; ENABLE-NEXT:    decl %ecx
; ENABLE-NEXT:    jne LBB1_2
; ENABLE-NEXT:  ## %bb.3: ## %for.end
; ENABLE-NEXT:    shll $3, %eax
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB1_4: ## %if.else
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    addl %esi, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: freqSaveAndRestoreOutsideLoop:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbx, -16
; DISABLE-NEXT:    testl %edi, %edi
; DISABLE-NEXT:    je LBB1_4
; DISABLE-NEXT:  ## %bb.1: ## %for.preheader
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    movl $10, %ecx
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB1_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    addl %edx, %eax
; DISABLE-NEXT:    decl %ecx
; DISABLE-NEXT:    jne LBB1_2
; DISABLE-NEXT:  ## %bb.3: ## %for.end
; DISABLE-NEXT:    shll $3, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB1_4: ## %if.else
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    addl %esi, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  %tobool = icmp eq i32 %cond, 0
  br i1 %tobool, label %if.else, label %for.preheader

for.preheader:
  tail call void asm "nop", ""()
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
  %sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
  %call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.04
  %inc = add nuw nsw i32 %i.05, 1
  %exitcond = icmp eq i32 %inc, 10
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  %shl = shl i32 %add, 3
  br label %if.end

if.else:                                          ; preds = %entry
  %mul = shl nsw i32 %N, 1
  br label %if.end

if.end:                                           ; preds = %if.else, %for.end
  %sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
  ret i32 %sum.1
}

declare i32 @something(...)

; Check that we do not perform the shrink-wrapping inside the loop even
; though that would be legal. The cost model must prevent that.
define i32 @freqSaveAndRestoreOutsideLoop2(i32 %cond) {
; ENABLE-LABEL: freqSaveAndRestoreOutsideLoop2:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbx, -16
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    movl $10, %ecx
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB2_1: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    addl %edx, %eax
; ENABLE-NEXT:    decl %ecx
; ENABLE-NEXT:    jne LBB2_1
; ENABLE-NEXT:  ## %bb.2: ## %for.exit
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: freqSaveAndRestoreOutsideLoop2:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbx, -16
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    movl $10, %ecx
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB2_1: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    addl %edx, %eax
; DISABLE-NEXT:    decl %ecx
; DISABLE-NEXT:    jne LBB2_1
; DISABLE-NEXT:  ## %bb.2: ## %for.exit
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  br label %for.preheader

for.preheader:
  tail call void asm "nop", ""()
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %i.04 = phi i32 [ 0, %for.preheader ], [ %inc, %for.body ]
  %sum.03 = phi i32 [ 0, %for.preheader ], [ %add, %for.body ]
  %call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.03
  %inc = add nuw nsw i32 %i.04, 1
  %exitcond = icmp eq i32 %inc, 10
  br i1 %exitcond, label %for.exit, label %for.body

for.exit:
  tail call void asm "nop", ""()
  br label %for.end

for.end:                                          ; preds = %for.body
  ret i32 %add
}

; Check with a more complex case that we do not have save within the loop and
; restore outside.
define i32 @loopInfoSaveOutsideLoop(i32 %cond, i32 %N) {
; ENABLE-LABEL: loopInfoSaveOutsideLoop:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testl %edi, %edi
; ENABLE-NEXT:    je LBB3_4
; ENABLE-NEXT:  ## %bb.1: ## %for.preheader
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbx, -16
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    movl $10, %ecx
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB3_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    addl %edx, %eax
; ENABLE-NEXT:    decl %ecx
; ENABLE-NEXT:    jne LBB3_2
; ENABLE-NEXT:  ## %bb.3: ## %for.end
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    shll $3, %eax
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB3_4: ## %if.else
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    addl %esi, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: loopInfoSaveOutsideLoop:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbx, -16
; DISABLE-NEXT:    testl %edi, %edi
; DISABLE-NEXT:    je LBB3_4
; DISABLE-NEXT:  ## %bb.1: ## %for.preheader
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    movl $10, %ecx
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB3_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    addl %edx, %eax
; DISABLE-NEXT:    decl %ecx
; DISABLE-NEXT:    jne LBB3_2
; DISABLE-NEXT:  ## %bb.3: ## %for.end
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    shll $3, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB3_4: ## %if.else
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    addl %esi, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  %tobool = icmp eq i32 %cond, 0
  br i1 %tobool, label %if.else, label %for.preheader

for.preheader:
  tail call void asm "nop", ""()
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
  %sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
  %call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.04
  %inc = add nuw nsw i32 %i.05, 1
  %exitcond = icmp eq i32 %inc, 10
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  tail call void asm "nop", "~{ebx}"()
  %shl = shl i32 %add, 3
  br label %if.end

if.else:                                          ; preds = %entry
  %mul = shl nsw i32 %N, 1
  br label %if.end

if.end:                                           ; preds = %if.else, %for.end
  %sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
  ret i32 %sum.1
}

; Check with a more complex case that we do not have restore within the loop and
; save outside.
define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) nounwind {
; ENABLE-LABEL: loopInfoRestoreOutsideLoop:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testl %edi, %edi
; ENABLE-NEXT:    je LBB4_4
; ENABLE-NEXT:  ## %bb.1: ## %if.then
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    movl $10, %ecx
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB4_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    addl %edx, %eax
; ENABLE-NEXT:    decl %ecx
; ENABLE-NEXT:    jne LBB4_2
; ENABLE-NEXT:  ## %bb.3: ## %for.end
; ENABLE-NEXT:    shll $3, %eax
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB4_4: ## %if.else
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    addl %esi, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: loopInfoRestoreOutsideLoop:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    testl %edi, %edi
; DISABLE-NEXT:    je LBB4_4
; DISABLE-NEXT:  ## %bb.1: ## %if.then
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    movl $10, %ecx
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB4_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    addl %edx, %eax
; DISABLE-NEXT:    decl %ecx
; DISABLE-NEXT:    jne LBB4_2
; DISABLE-NEXT:  ## %bb.3: ## %for.end
; DISABLE-NEXT:    shll $3, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB4_4: ## %if.else
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    addl %esi, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  %tobool = icmp eq i32 %cond, 0
  br i1 %tobool, label %if.else, label %if.then

if.then:                                          ; preds = %entry
  tail call void asm "nop", "~{ebx}"()
  br label %for.body

for.body:                                         ; preds = %for.body, %if.then
  %i.05 = phi i32 [ 0, %if.then ], [ %inc, %for.body ]
  %sum.04 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
  %call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.04
  %inc = add nuw nsw i32 %i.05, 1
  %exitcond = icmp eq i32 %inc, 10
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  %shl = shl i32 %add, 3
  br label %if.end

if.else:                                          ; preds = %entry
  %mul = shl nsw i32 %N, 1
  br label %if.end

if.end:                                           ; preds = %if.else, %for.end
  %sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
  ret i32 %sum.1
}

; Check that we handle function with no frame information correctly.
define i32 @emptyFrame() {
; ENABLE-LABEL: emptyFrame:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: emptyFrame:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    retq
entry:
  ret i32 0
}

; Check that we handle inline asm correctly.
define i32 @inlineAsm(i32 %cond, i32 %N) {
; ENABLE-LABEL: inlineAsm:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testl %edi, %edi
; ENABLE-NEXT:    je LBB6_4
; ENABLE-NEXT:  ## %bb.1: ## %for.preheader
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbx, -16
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    movl $10, %eax
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB6_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    addl $1, %ebx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    decl %eax
; ENABLE-NEXT:    jne LBB6_2
; ENABLE-NEXT:  ## %bb.3: ## %for.exit
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB6_4: ## %if.else
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    addl %esi, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: inlineAsm:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbx, -16
; DISABLE-NEXT:    testl %edi, %edi
; DISABLE-NEXT:    je LBB6_4
; DISABLE-NEXT:  ## %bb.1: ## %for.preheader
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    movl $10, %eax
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB6_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    addl $1, %ebx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    decl %eax
; DISABLE-NEXT:    jne LBB6_2
; DISABLE-NEXT:  ## %bb.3: ## %for.exit
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB6_4: ## %if.else
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    addl %esi, %eax
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  %tobool = icmp eq i32 %cond, 0
  br i1 %tobool, label %if.else, label %for.preheader

for.preheader:
  tail call void asm "nop", ""()
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.03 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
  tail call void asm "addl $$1, %ebx", "~{ebx}"()
  %inc = add nuw nsw i32 %i.03, 1
  %exitcond = icmp eq i32 %inc, 10
  br i1 %exitcond, label %for.exit, label %for.body

for.exit:
  tail call void asm "nop", ""()
  br label %if.end

if.else:                                          ; preds = %entry
  %mul = shl nsw i32 %N, 1
  br label %if.end

if.end:                                           ; preds = %for.body, %if.else
  %sum.0 = phi i32 [ %mul, %if.else ], [ 0, %for.exit ]
  ret i32 %sum.0
}

; Check that we handle calls to variadic functions correctly.
define i32 @callVariadicFunc(i32 %cond, i32 %N) {
; ENABLE-LABEL: callVariadicFunc:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    testl %edi, %edi
; ENABLE-NEXT:    je LBB7_2
; ENABLE-NEXT:  ## %bb.1: ## %if.then
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    movl %eax, (%rsp)
; ENABLE-NEXT:    movl %eax, %edi
; ENABLE-NEXT:    movl %eax, %esi
; ENABLE-NEXT:    movl %eax, %edx
; ENABLE-NEXT:    movl %eax, %ecx
; ENABLE-NEXT:    movl %eax, %r8d
; ENABLE-NEXT:    movl %eax, %r9d
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    callq _someVariadicFunc
; ENABLE-NEXT:    shll $3, %eax
; ENABLE-NEXT:    addq $8, %rsp
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB7_2: ## %if.else
; ENABLE-NEXT:    addl %eax, %eax
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: callVariadicFunc:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    testl %edi, %edi
; DISABLE-NEXT:    je LBB7_2
; DISABLE-NEXT:  ## %bb.1: ## %if.then
; DISABLE-NEXT:    movl %eax, (%rsp)
; DISABLE-NEXT:    movl %eax, %edi
; DISABLE-NEXT:    movl %eax, %esi
; DISABLE-NEXT:    movl %eax, %edx
; DISABLE-NEXT:    movl %eax, %ecx
; DISABLE-NEXT:    movl %eax, %r8d
; DISABLE-NEXT:    movl %eax, %r9d
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    callq _someVariadicFunc
; DISABLE-NEXT:    shll $3, %eax
; DISABLE-NEXT:    popq %rcx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB7_2: ## %if.else
; DISABLE-NEXT:    addl %eax, %eax
; DISABLE-NEXT:    popq %rcx
; DISABLE-NEXT:    retq
entry:
  %tobool = icmp eq i32 %cond, 0
  br i1 %tobool, label %if.else, label %if.then

if.then:                                          ; preds = %entry
  %call = tail call i32 (i32, ...) @someVariadicFunc(i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N)
  %shl = shl i32 %call, 3
  br label %if.end

if.else:                                          ; preds = %entry
  %mul = shl nsw i32 %N, 1
  br label %if.end

if.end:                                           ; preds = %if.else, %if.then
  %sum.0 = phi i32 [ %shl, %if.then ], [ %mul, %if.else ]
  ret i32 %sum.0
}

declare i32 @someVariadicFunc(i32, ...)

; Check that we use LEA not to clobber EFLAGS.
%struct.temp_slot = type { ptr, ptr, ptr, i32, i64, ptr, ptr, i8, i8, i32, i32, i64, i64 }
%union.tree_node = type { %struct.tree_decl }
%struct.tree_decl = type { %struct.tree_common, ptr, i32, i32, ptr, i48, %union.anon, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, %union.anon.1, ptr, ptr, ptr, i64, ptr }
%struct.tree_common = type { ptr, ptr, i32 }
%union.anon = type { i64 }
%union.anon.1 = type { ptr }
%struct.function = type { ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, i32, i32, i32, i32, ptr, %struct.ix86_args, ptr, ptr, ptr, ptr, i32, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, i64, ptr, ptr, ptr, ptr, i32, ptr, ptr, i32, i32, i32, ptr, i32, i32, ptr, ptr, ptr, i32, i32, ptr, i32, i32, ptr, ptr, i24 }
%struct.eh_status = type opaque
%struct.stmt_status = type opaque
%struct.expr_status = type { i32, i32, i32, ptr, ptr, ptr, ptr }
%struct.emit_status = type { i32, i32, ptr, ptr, ptr, ptr, i32, i32, ptr, i32, ptr, ptr, ptr }
%struct.sequence_stack = type { ptr, ptr, ptr, ptr }
%struct.varasm_status = type opaque
%struct.ix86_args = type { i32, i32, i32, i32, i32, i32, i32 }
%struct.initial_value_struct = type opaque
%struct.var_refs_queue = type { ptr, i32, i32, ptr }
%struct.machine_function = type opaque
%struct.language_function = type opaque
%struct.lang_decl = type opaque
%struct.rtx_def = type { i32, [1 x %union.rtunion_def] }
%union.rtunion_def = type { i64 }

declare hidden fastcc ptr @find_temp_slot_from_address(ptr readonly)

define void @useLEA(ptr readonly %x) {
; ENABLE-LABEL: useLEA:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testq %rdi, %rdi
; ENABLE-NEXT:    je LBB8_9
; ENABLE-NEXT:  ## %bb.1: ## %if.end
; ENABLE-NEXT:    cmpw $66, (%rdi)
; ENABLE-NEXT:    jne LBB8_9
; ENABLE-NEXT:  ## %bb.2: ## %lor.lhs.false
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    movq 8(%rdi), %rdi
; ENABLE-NEXT:    movzwl (%rdi), %eax
; ENABLE-NEXT:    leal -54(%rax), %ecx
; ENABLE-NEXT:    cmpl $14, %ecx
; ENABLE-NEXT:    ja LBB8_3
; ENABLE-NEXT:  ## %bb.7: ## %lor.lhs.false
; ENABLE-NEXT:    movl $24599, %edx ## imm = 0x6017
; ENABLE-NEXT:    btl %ecx, %edx
; ENABLE-NEXT:    jae LBB8_3
; ENABLE-NEXT:  LBB8_8:
; ENABLE-NEXT:    addq $8, %rsp
; ENABLE-NEXT:  LBB8_9: ## %cleanup
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB8_3: ## %lor.lhs.false
; ENABLE-NEXT:    cmpl $134, %eax
; ENABLE-NEXT:    je LBB8_8
; ENABLE-NEXT:  ## %bb.4: ## %lor.lhs.false
; ENABLE-NEXT:    cmpl $140, %eax
; ENABLE-NEXT:    je LBB8_8
; ENABLE-NEXT:  ## %bb.5: ## %if.end.55
; ENABLE-NEXT:    callq _find_temp_slot_from_address
; ENABLE-NEXT:    testq %rax, %rax
; ENABLE-NEXT:    je LBB8_8
; ENABLE-NEXT:  ## %bb.6: ## %if.then.60
; ENABLE-NEXT:    movb $1, 57(%rax)
; ENABLE-NEXT:    jmp LBB8_8
;
; DISABLE-LABEL: useLEA:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    testq %rdi, %rdi
; DISABLE-NEXT:    je LBB8_7
; DISABLE-NEXT:  ## %bb.1: ## %if.end
; DISABLE-NEXT:    cmpw $66, (%rdi)
; DISABLE-NEXT:    jne LBB8_7
; DISABLE-NEXT:  ## %bb.2: ## %lor.lhs.false
; DISABLE-NEXT:    movq 8(%rdi), %rdi
; DISABLE-NEXT:    movzwl (%rdi), %eax
; DISABLE-NEXT:    leal -54(%rax), %ecx
; DISABLE-NEXT:    cmpl $14, %ecx
; DISABLE-NEXT:    ja LBB8_3
; DISABLE-NEXT:  ## %bb.8: ## %lor.lhs.false
; DISABLE-NEXT:    movl $24599, %edx ## imm = 0x6017
; DISABLE-NEXT:    btl %ecx, %edx
; DISABLE-NEXT:    jae LBB8_3
; DISABLE-NEXT:  LBB8_7: ## %cleanup
; DISABLE-NEXT:    popq %rax
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB8_3: ## %lor.lhs.false
; DISABLE-NEXT:    cmpl $134, %eax
; DISABLE-NEXT:    je LBB8_7
; DISABLE-NEXT:  ## %bb.4: ## %lor.lhs.false
; DISABLE-NEXT:    cmpl $140, %eax
; DISABLE-NEXT:    je LBB8_7
; DISABLE-NEXT:  ## %bb.5: ## %if.end.55
; DISABLE-NEXT:    callq _find_temp_slot_from_address
; DISABLE-NEXT:    testq %rax, %rax
; DISABLE-NEXT:    je LBB8_7
; DISABLE-NEXT:  ## %bb.6: ## %if.then.60
; DISABLE-NEXT:    movb $1, 57(%rax)
; DISABLE-NEXT:    popq %rax
; DISABLE-NEXT:    retq
entry:
  %cmp = icmp eq ptr %x, null
  br i1 %cmp, label %cleanup, label %if.end

if.end:                                           ; preds = %entry
  %bf.load = load i32, ptr %x, align 8
  %bf.clear = and i32 %bf.load, 65535
  %cmp1 = icmp eq i32 %bf.clear, 66
  br i1 %cmp1, label %lor.lhs.false, label %cleanup

lor.lhs.false:                                    ; preds = %if.end
  %arrayidx = getelementptr inbounds %struct.rtx_def, ptr %x, i64 0, i32 1, i64 0
  %tmp1 = load ptr, ptr %arrayidx, align 8
  %bf.load2 = load i32, ptr %tmp1, align 8
  %bf.clear3 = and i32 %bf.load2, 65535
  switch i32 %bf.clear3, label %if.end.55 [
    i32 67, label %cleanup
    i32 68, label %cleanup
    i32 54, label %cleanup
    i32 55, label %cleanup
    i32 58, label %cleanup
    i32 134, label %cleanup
    i32 56, label %cleanup
    i32 140, label %cleanup
  ]

if.end.55:                                        ; preds = %lor.lhs.false
  %call = tail call fastcc ptr @find_temp_slot_from_address(ptr %tmp1) #2
  %cmp59 = icmp eq ptr %call, null
  br i1 %cmp59, label %cleanup, label %if.then.60

if.then.60:                                       ; preds = %if.end.55
  %addr_taken = getelementptr inbounds %struct.temp_slot, ptr %call, i64 0, i32 8
  store i8 1, ptr %addr_taken, align 1
  br label %cleanup

cleanup:                                          ; preds = %if.then.60, %if.end.55, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %if.end, %entry
  ret void
}

; Make sure we do not insert unreachable code after noreturn function.
; Although this is not incorrect to insert such code, it is useless
; and it hurts the binary size.
define i32 @noreturn(i8 signext %bad_thing) {
; ENABLE-LABEL: noreturn:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    testb %dil, %dil
; ENABLE-NEXT:    jne LBB9_2
; ENABLE-NEXT:  ## %bb.1: ## %if.end
; ENABLE-NEXT:    movl $42, %eax
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB9_2: ## %if.abort
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    callq _abort
;
; DISABLE-LABEL: noreturn:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    testb %dil, %dil
; DISABLE-NEXT:    jne LBB9_2
; DISABLE-NEXT:  ## %bb.1: ## %if.end
; DISABLE-NEXT:    movl $42, %eax
; DISABLE-NEXT:    popq %rcx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB9_2: ## %if.abort
; DISABLE-NEXT:    callq _abort
entry:
  %tobool = icmp eq i8 %bad_thing, 0
  br i1 %tobool, label %if.end, label %if.abort

if.abort:
  tail call void @abort() #0
  unreachable

if.end:
  ret i32 42
}

declare void @abort() #0

attributes #0 = { noreturn nounwind }


; Make sure that we handle infinite loops properly When checking that the Save
; and Restore blocks are control flow equivalent, the loop searches for the
; immediate (post) dominator for the (restore) save blocks. When either the Save
; or Restore block is located in an infinite loop the only immediate (post)
; dominator is itself. In this case, we cannot perform shrink wrapping, but we
; should return gracefully and continue compilation.
; The only condition for this test is the compilation finishes correctly.
;
define void @infiniteloop() {
; ENABLE-LABEL: infiniteloop:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rbp
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbp, -16
; ENABLE-NEXT:    movq %rsp, %rbp
; ENABLE-NEXT:    .cfi_def_cfa_register %rbp
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_offset %rbx, -24
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    testb %al, %al
; ENABLE-NEXT:    jne LBB10_3
; ENABLE-NEXT:  ## %bb.1: ## %if.then
; ENABLE-NEXT:    movq %rsp, %rcx
; ENABLE-NEXT:    addq $-16, %rcx
; ENABLE-NEXT:    movq %rcx, %rsp
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB10_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    addl %edx, %eax
; ENABLE-NEXT:    movl %eax, (%rcx)
; ENABLE-NEXT:    jmp LBB10_2
; ENABLE-NEXT:  LBB10_3: ## %if.end
; ENABLE-NEXT:    leaq -8(%rbp), %rsp
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    popq %rbp
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: infiniteloop:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbp
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbp, -16
; DISABLE-NEXT:    movq %rsp, %rbp
; DISABLE-NEXT:    .cfi_def_cfa_register %rbp
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_offset %rbx, -24
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    testb %al, %al
; DISABLE-NEXT:    jne LBB10_3
; DISABLE-NEXT:  ## %bb.1: ## %if.then
; DISABLE-NEXT:    movq %rsp, %rcx
; DISABLE-NEXT:    addq $-16, %rcx
; DISABLE-NEXT:    movq %rcx, %rsp
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB10_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    addl %edx, %eax
; DISABLE-NEXT:    movl %eax, (%rcx)
; DISABLE-NEXT:    jmp LBB10_2
; DISABLE-NEXT:  LBB10_3: ## %if.end
; DISABLE-NEXT:    leaq -8(%rbp), %rsp
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    popq %rbp
; DISABLE-NEXT:    retq
entry:
  br i1 undef, label %if.then, label %if.end

if.then:
  %ptr = alloca i32, i32 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %sum.03 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
  %call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.03
  store i32 %add, ptr %ptr
  br label %for.body

if.end:
  ret void
}

; Another infinite loop test this time with a body bigger than just one block.
define void @infiniteloop2() {
; ENABLE-LABEL: infiniteloop2:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rbp
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbp, -16
; ENABLE-NEXT:    movq %rsp, %rbp
; ENABLE-NEXT:    .cfi_def_cfa_register %rbp
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_offset %rbx, -24
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    testb %al, %al
; ENABLE-NEXT:    jne LBB11_5
; ENABLE-NEXT:  ## %bb.1: ## %if.then
; ENABLE-NEXT:    movq %rsp, %rcx
; ENABLE-NEXT:    addq $-16, %rcx
; ENABLE-NEXT:    movq %rcx, %rsp
; ENABLE-NEXT:    xorl %edx, %edx
; ENABLE-NEXT:    jmp LBB11_2
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB11_4: ## %body2
; ENABLE-NEXT:    ## in Loop: Header=BB11_2 Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:  LBB11_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    movl %edx, %esi
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    movl $1, %edx
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    addl %esi, %edx
; ENABLE-NEXT:    movl %edx, (%rcx)
; ENABLE-NEXT:    testb %al, %al
; ENABLE-NEXT:    jne LBB11_4
; ENABLE-NEXT:  ## %bb.3: ## %body1
; ENABLE-NEXT:    ## in Loop: Header=BB11_2 Depth=1
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    jmp LBB11_2
; ENABLE-NEXT:  LBB11_5: ## %if.end
; ENABLE-NEXT:    leaq -8(%rbp), %rsp
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    popq %rbp
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: infiniteloop2:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbp
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbp, -16
; DISABLE-NEXT:    movq %rsp, %rbp
; DISABLE-NEXT:    .cfi_def_cfa_register %rbp
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_offset %rbx, -24
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    testb %al, %al
; DISABLE-NEXT:    jne LBB11_5
; DISABLE-NEXT:  ## %bb.1: ## %if.then
; DISABLE-NEXT:    movq %rsp, %rcx
; DISABLE-NEXT:    addq $-16, %rcx
; DISABLE-NEXT:    movq %rcx, %rsp
; DISABLE-NEXT:    xorl %edx, %edx
; DISABLE-NEXT:    jmp LBB11_2
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB11_4: ## %body2
; DISABLE-NEXT:    ## in Loop: Header=BB11_2 Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:  LBB11_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    movl %edx, %esi
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    movl $1, %edx
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    addl %esi, %edx
; DISABLE-NEXT:    movl %edx, (%rcx)
; DISABLE-NEXT:    testb %al, %al
; DISABLE-NEXT:    jne LBB11_4
; DISABLE-NEXT:  ## %bb.3: ## %body1
; DISABLE-NEXT:    ## in Loop: Header=BB11_2 Depth=1
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    jmp LBB11_2
; DISABLE-NEXT:  LBB11_5: ## %if.end
; DISABLE-NEXT:    leaq -8(%rbp), %rsp
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    popq %rbp
; DISABLE-NEXT:    retq
entry:
  br i1 undef, label %if.then, label %if.end

if.then:
  %ptr = alloca i32, i32 4
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %sum.03 = phi i32 [ 0, %if.then ], [ %add, %body1 ], [ 1, %body2]
  %call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
  %add = add nsw i32 %call, %sum.03
  store i32 %add, ptr %ptr
  br i1 undef, label %body1, label %body2

body1:
  tail call void asm sideeffect "nop", "~{ebx}"()
  br label %for.body

body2:
  tail call void asm sideeffect "nop", "~{ebx}"()
  br label %for.body

if.end:
  ret void
}

; Another infinite loop test this time with two nested infinite loop.
define void @infiniteloop3() {
; ENABLE-LABEL: infiniteloop3:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    testb %al, %al
; ENABLE-NEXT:    jne LBB12_2
; ENABLE-NEXT:  ## %bb.1: ## %body
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    testb %al, %al
; ENABLE-NEXT:    jne LBB12_7
; ENABLE-NEXT:  LBB12_2: ## %loop2a.preheader
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    xorl %ecx, %ecx
; ENABLE-NEXT:    movq %rax, %rsi
; ENABLE-NEXT:    jmp LBB12_4
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB12_3: ## %loop2b
; ENABLE-NEXT:    ## in Loop: Header=BB12_4 Depth=1
; ENABLE-NEXT:    movq %rdx, (%rsi)
; ENABLE-NEXT:    movq %rdx, %rsi
; ENABLE-NEXT:  LBB12_4: ## %loop1
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    movq %rcx, %rdx
; ENABLE-NEXT:    testq %rax, %rax
; ENABLE-NEXT:    movq (%rax), %rcx
; ENABLE-NEXT:    jne LBB12_3
; ENABLE-NEXT:  ## %bb.5: ## in Loop: Header=BB12_4 Depth=1
; ENABLE-NEXT:    movq %rdx, %rax
; ENABLE-NEXT:    movq %rdx, %rsi
; ENABLE-NEXT:    jmp LBB12_4
; ENABLE-NEXT:  LBB12_7: ## %end
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: infiniteloop3:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    testb %al, %al
; DISABLE-NEXT:    jne LBB12_2
; DISABLE-NEXT:  ## %bb.1: ## %body
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    testb %al, %al
; DISABLE-NEXT:    jne LBB12_7
; DISABLE-NEXT:  LBB12_2: ## %loop2a.preheader
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    xorl %ecx, %ecx
; DISABLE-NEXT:    movq %rax, %rsi
; DISABLE-NEXT:    jmp LBB12_4
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB12_3: ## %loop2b
; DISABLE-NEXT:    ## in Loop: Header=BB12_4 Depth=1
; DISABLE-NEXT:    movq %rdx, (%rsi)
; DISABLE-NEXT:    movq %rdx, %rsi
; DISABLE-NEXT:  LBB12_4: ## %loop1
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    movq %rcx, %rdx
; DISABLE-NEXT:    testq %rax, %rax
; DISABLE-NEXT:    movq (%rax), %rcx
; DISABLE-NEXT:    jne LBB12_3
; DISABLE-NEXT:  ## %bb.5: ## in Loop: Header=BB12_4 Depth=1
; DISABLE-NEXT:    movq %rdx, %rax
; DISABLE-NEXT:    movq %rdx, %rsi
; DISABLE-NEXT:    jmp LBB12_4
; DISABLE-NEXT:  LBB12_7: ## %end
; DISABLE-NEXT:    retq
entry:
  br i1 undef, label %loop2a, label %body

body:                                             ; preds = %entry
  br i1 undef, label %loop2a, label %end

loop1:                                            ; preds = %loop2a, %loop2b
  %var.phi = phi ptr [ %next.phi, %loop2b ], [ %var, %loop2a ]
  %next.phi = phi ptr [ %next.load, %loop2b ], [ %next.var, %loop2a ]
  %0 = icmp eq ptr %var, null
  %next.load = load ptr, ptr undef
  br i1 %0, label %loop2a, label %loop2b

loop2a:                                           ; preds = %loop1, %body, %entry
  %var = phi ptr [ null, %body ], [ null, %entry ], [ %next.phi, %loop1 ]
  %next.var = phi ptr [ undef, %body ], [ null, %entry ], [ %next.load, %loop1 ]
  br label %loop1

loop2b:                                           ; preds = %loop1
  store ptr %next.phi, ptr %var.phi
  br label %loop1

end:
  ret void
}

; Check that we just don't bail out on RegMask.
; In this case, the RegMask does not touch a CSR so we are good to go!
define i32 @regmask(i32 %a, i32 %b, ptr %addr) {
; ENABLE-LABEL: regmask:
; ENABLE:       ## %bb.0:
; ENABLE-NEXT:    cmpl %esi, %edi
; ENABLE-NEXT:    jge LBB13_2
; ENABLE-NEXT:  ## %bb.1: ## %true
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbx, -16
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    xorl %edi, %edi
; ENABLE-NEXT:    movq %rdx, %rsi
; ENABLE-NEXT:    callq _doSomething
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB13_2: ## %false
; ENABLE-NEXT:    movl $6, %edi
; ENABLE-NEXT:    movq %rdx, %rsi
; ENABLE-NEXT:    jmp _doSomething ## TAILCALL
;
; DISABLE-LABEL: regmask:
; DISABLE:       ## %bb.0:
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbx, -16
; DISABLE-NEXT:    cmpl %esi, %edi
; DISABLE-NEXT:    jge LBB13_2
; DISABLE-NEXT:  ## %bb.1: ## %true
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    xorl %edi, %edi
; DISABLE-NEXT:    movq %rdx, %rsi
; DISABLE-NEXT:    callq _doSomething
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB13_2: ## %false
; DISABLE-NEXT:    movl $6, %edi
; DISABLE-NEXT:    movq %rdx, %rsi
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    jmp _doSomething ## TAILCALL
  %tmp2 = icmp slt i32 %a, %b
  br i1 %tmp2, label %true, label %false

true:
  ; Clobber a CSR so that we check something on the regmask
  ; of the tail call.
  tail call void asm sideeffect "nop", "~{ebx}"()
  %tmp4 = call i32 @doSomething(i32 0, ptr %addr)
  br label %end

false:
  %tmp5 = tail call i32 @doSomething(i32 6, ptr %addr)
  br label %end

end:
  %tmp.0 = phi i32 [ %tmp4, %true ], [ %tmp5, %false ]
  ret i32 %tmp.0
}

@b = internal unnamed_addr global i1 false
@c = internal unnamed_addr global i8 0, align 1
@a = common global i32 0, align 4

; Make sure the prologue does not clobber the EFLAGS when
; it is live accross.
; PR25629.
; Note: The registers may change in the following patterns, but
; because they imply register hierarchy (e.g., eax, al) this is
; tricky to write robust patterns.
define i32 @useLEAForPrologue(i32 %d, i32 %a, i8 %c) #3 {
; ENABLE-LABEL: useLEAForPrologue:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    subq $16, %rsp
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    cmpb $0, _b(%rip)
; ENABLE-NEXT:    movl $48, %ecx
; ENABLE-NEXT:    cmovnel %eax, %ecx
; ENABLE-NEXT:    movb %cl, _c(%rip)
; ENABLE-NEXT:    je LBB14_4
; ENABLE-NEXT:  ## %bb.1: ## %for.body.lr.ph
; ENABLE-NEXT:    ## InlineAsm Start
; ENABLE-NEXT:    nop
; ENABLE-NEXT:    ## InlineAsm End
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB14_2: ## %for.body
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    cmpl %esi, %edi
; ENABLE-NEXT:    setl %al
; ENABLE-NEXT:    xorl %esi, %esi
; ENABLE-NEXT:    movb %al, %sil
; ENABLE-NEXT:    incb %dl
; ENABLE-NEXT:    cmpb $45, %dl
; ENABLE-NEXT:    jl LBB14_2
; ENABLE-NEXT:  ## %bb.3: ## %for.cond.for.end_crit_edge
; ENABLE-NEXT:    movq _a@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    movl %esi, (%rax)
; ENABLE-NEXT:  LBB14_4: ## %for.end
; ENABLE-NEXT:    xorl %edi, %edi
; ENABLE-NEXT:    callq _varfunc
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    addq $16, %rsp
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: useLEAForPrologue:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    subq $16, %rsp
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    cmpb $0, _b(%rip)
; DISABLE-NEXT:    movl $48, %ecx
; DISABLE-NEXT:    cmovnel %eax, %ecx
; DISABLE-NEXT:    movb %cl, _c(%rip)
; DISABLE-NEXT:    je LBB14_4
; DISABLE-NEXT:  ## %bb.1: ## %for.body.lr.ph
; DISABLE-NEXT:    ## InlineAsm Start
; DISABLE-NEXT:    nop
; DISABLE-NEXT:    ## InlineAsm End
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB14_2: ## %for.body
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    cmpl %esi, %edi
; DISABLE-NEXT:    setl %al
; DISABLE-NEXT:    xorl %esi, %esi
; DISABLE-NEXT:    movb %al, %sil
; DISABLE-NEXT:    incb %dl
; DISABLE-NEXT:    cmpb $45, %dl
; DISABLE-NEXT:    jl LBB14_2
; DISABLE-NEXT:  ## %bb.3: ## %for.cond.for.end_crit_edge
; DISABLE-NEXT:    movq _a@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    movl %esi, (%rax)
; DISABLE-NEXT:  LBB14_4: ## %for.end
; DISABLE-NEXT:    xorl %edi, %edi
; DISABLE-NEXT:    callq _varfunc
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    addq $16, %rsp
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    retq
entry:
  %tmp = alloca i3
  %.b = load i1, ptr @b, align 1
  %bool = select i1 %.b, i8 0, i8 48
  store i8 %bool, ptr @c, align 1
  br i1 %.b, label %for.body.lr.ph, label %for.end

for.body.lr.ph:                                   ; preds = %entry
  tail call void asm sideeffect "nop", "~{ebx}"()
  br label %for.body

for.body:                                         ; preds = %for.body.lr.ph, %for.body
  %inc6 = phi i8 [ %c, %for.body.lr.ph ], [ %inc, %for.body ]
  %cond5 = phi i32 [ %a, %for.body.lr.ph ], [ %conv3, %for.body ]
  %cmp2 = icmp slt i32 %d, %cond5
  %conv3 = zext i1 %cmp2 to i32
  %inc = add i8 %inc6, 1
  %cmp = icmp slt i8 %inc, 45
  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge

for.cond.for.end_crit_edge:                       ; preds = %for.body
  store i32 %conv3, ptr @a, align 4
  br label %for.end

for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
  %call = tail call i32 (ptr) @varfunc(ptr null)
  ret i32 0
}

declare i32 @varfunc(ptr nocapture readonly)

@sum1 = external hidden thread_local global i32, align 4


; Function Attrs: nounwind
; Make sure the TLS call used to access @sum1 happens after the prologue
; and before the epilogue.
; TLS calls used to be wrongly model and shrink-wrapping would have inserted
; the prologue and epilogue just around the call to doSomething.
; PR25820.
define i32 @tlsCall(i1 %bool1, i32 %arg, ptr readonly dereferenceable(4) %sum1) #3 {
; ENABLE-LABEL: tlsCall:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    testb $1, %dil
; ENABLE-NEXT:    je LBB15_2
; ENABLE-NEXT:  ## %bb.1: ## %main
; ENABLE-NEXT:    movl (%rdx), %ecx
; ENABLE-NEXT:    movq _sum1@TLVP(%rip), %rdi
; ENABLE-NEXT:    callq *(%rdi)
; ENABLE-NEXT:    movl %ecx, (%rax)
; ENABLE-NEXT:    jmp LBB15_3
; ENABLE-NEXT:  LBB15_2: ## %else
; ENABLE-NEXT:    xorl %edi, %edi
; ENABLE-NEXT:    xorl %esi, %esi
; ENABLE-NEXT:    callq _doSomething
; ENABLE-NEXT:    movl %eax, %esi
; ENABLE-NEXT:  LBB15_3: ## %exit
; ENABLE-NEXT:    movl %esi, %eax
; ENABLE-NEXT:    popq %rcx
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: tlsCall:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    testb $1, %dil
; DISABLE-NEXT:    je LBB15_2
; DISABLE-NEXT:  ## %bb.1: ## %main
; DISABLE-NEXT:    movl (%rdx), %ecx
; DISABLE-NEXT:    movq _sum1@TLVP(%rip), %rdi
; DISABLE-NEXT:    callq *(%rdi)
; DISABLE-NEXT:    movl %ecx, (%rax)
; DISABLE-NEXT:    jmp LBB15_3
; DISABLE-NEXT:  LBB15_2: ## %else
; DISABLE-NEXT:    xorl %edi, %edi
; DISABLE-NEXT:    xorl %esi, %esi
; DISABLE-NEXT:    callq _doSomething
; DISABLE-NEXT:    movl %eax, %esi
; DISABLE-NEXT:  LBB15_3: ## %exit
; DISABLE-NEXT:    movl %esi, %eax
; DISABLE-NEXT:    popq %rcx
; DISABLE-NEXT:    retq
entry:
  br i1 %bool1, label %main, label %else

main:
  %tmp1 = load i32, ptr %sum1, align 4
  store i32 %tmp1, ptr @sum1, align 4
  br label %exit

else:
  %call = call i32 @doSomething(i32 0, ptr null)
  br label %exit

exit:
  %res = phi i32 [ %arg, %main], [ %call, %else ]
  ret i32 %res
}

attributes #3 = { nounwind }

@irreducibleCFGa = common global i32 0, align 4
@irreducibleCFGf = common global i8 0, align 1
@irreducibleCFGb = common global i32 0, align 4

; Check that we do not run shrink-wrapping on irreducible CFGs until
; it is actually supported.
; At the moment, on those CFGs the loop information may be incorrect
; and since we use that information to do the placement, we may end up
; inserting the prologue/epilogue at incorrect places.
; PR25988.
; Make sure we emit missed optimization remarks for this.
; REMARKS: Pass:            shrink-wrap
; REMARKS-NEXT: Name:            UnsupportedIrreducibleCFG
; REMARKS-NEXT: Function:        irreducibleCFG
; REMARKS-NEXT: Args:
; REMARKS-NEXT:   - String:          Irreducible CFGs are not supported yet

define i32 @irreducibleCFG() #4 {
; ENABLE-LABEL: irreducibleCFG:
; ENABLE:       ## %bb.0: ## %entry
; ENABLE-NEXT:    pushq %rbp
; ENABLE-NEXT:    .cfi_def_cfa_offset 16
; ENABLE-NEXT:    .cfi_offset %rbp, -16
; ENABLE-NEXT:    movq %rsp, %rbp
; ENABLE-NEXT:    .cfi_def_cfa_register %rbp
; ENABLE-NEXT:    pushq %rbx
; ENABLE-NEXT:    pushq %rax
; ENABLE-NEXT:    .cfi_offset %rbx, -24
; ENABLE-NEXT:    movq _irreducibleCFGf@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    cmpb $0, (%rax)
; ENABLE-NEXT:    je LBB16_2
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB16_1: ## %preheader
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    jmp LBB16_1
; ENABLE-NEXT:  LBB16_2: ## %split
; ENABLE-NEXT:    movq _irreducibleCFGb@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    cmpl $0, (%rax)
; ENABLE-NEXT:    je LBB16_3
; ENABLE-NEXT:  ## %bb.4: ## %for.body4.i
; ENABLE-NEXT:    movq _irreducibleCFGa@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    movl (%rax), %edi
; ENABLE-NEXT:    xorl %ebx, %ebx
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    callq _something
; ENABLE-NEXT:    jmp LBB16_5
; ENABLE-NEXT:  LBB16_3:
; ENABLE-NEXT:    xorl %ebx, %ebx
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB16_5: ## %for.inc
; ENABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    incl %ebx
; ENABLE-NEXT:    cmpl $7, %ebx
; ENABLE-NEXT:    jl LBB16_5
; ENABLE-NEXT:  ## %bb.6: ## %fn1.exit
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    addq $8, %rsp
; ENABLE-NEXT:    popq %rbx
; ENABLE-NEXT:    popq %rbp
; ENABLE-NEXT:    retq
;
; DISABLE-LABEL: irreducibleCFG:
; DISABLE:       ## %bb.0: ## %entry
; DISABLE-NEXT:    pushq %rbp
; DISABLE-NEXT:    .cfi_def_cfa_offset 16
; DISABLE-NEXT:    .cfi_offset %rbp, -16
; DISABLE-NEXT:    movq %rsp, %rbp
; DISABLE-NEXT:    .cfi_def_cfa_register %rbp
; DISABLE-NEXT:    pushq %rbx
; DISABLE-NEXT:    pushq %rax
; DISABLE-NEXT:    .cfi_offset %rbx, -24
; DISABLE-NEXT:    movq _irreducibleCFGf@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    cmpb $0, (%rax)
; DISABLE-NEXT:    je LBB16_2
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB16_1: ## %preheader
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    jmp LBB16_1
; DISABLE-NEXT:  LBB16_2: ## %split
; DISABLE-NEXT:    movq _irreducibleCFGb@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    cmpl $0, (%rax)
; DISABLE-NEXT:    je LBB16_3
; DISABLE-NEXT:  ## %bb.4: ## %for.body4.i
; DISABLE-NEXT:    movq _irreducibleCFGa@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    movl (%rax), %edi
; DISABLE-NEXT:    xorl %ebx, %ebx
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    callq _something
; DISABLE-NEXT:    jmp LBB16_5
; DISABLE-NEXT:  LBB16_3:
; DISABLE-NEXT:    xorl %ebx, %ebx
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB16_5: ## %for.inc
; DISABLE-NEXT:    ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    incl %ebx
; DISABLE-NEXT:    cmpl $7, %ebx
; DISABLE-NEXT:    jl LBB16_5
; DISABLE-NEXT:  ## %bb.6: ## %fn1.exit
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    addq $8, %rsp
; DISABLE-NEXT:    popq %rbx
; DISABLE-NEXT:    popq %rbp
; DISABLE-NEXT:    retq
entry:
  %i0 = load i32, ptr @irreducibleCFGa, align 4
  %.pr = load i8, ptr @irreducibleCFGf, align 1
  %bool = icmp eq i8 %.pr, 0
  br i1 %bool, label %split, label %preheader

preheader:
  br label %preheader

split:
  %i1 = load i32, ptr @irreducibleCFGb, align 4
  %tobool1.i = icmp ne i32 %i1, 0
  br i1 %tobool1.i, label %for.body4.i, label %for.cond8.i.preheader

for.body4.i:
  %call.i = tail call i32 (...) @something(i32 %i0)
  br label %for.cond8

for.cond8:
  %p1 = phi i32 [ %inc18.i, %for.inc ], [ 0, %for.body4.i ]
  %.pr1.pr = load i32, ptr @irreducibleCFGb, align 4
  br label %for.cond8.i.preheader

for.cond8.i.preheader:
  %.pr1 = phi i32 [ %.pr1.pr, %for.cond8 ], [ %i1, %split ]
  %p13 = phi i32 [ %p1, %for.cond8 ], [ 0, %split ]
  br label %for.inc

fn1.exit:
  ret i32 0

for.inc:
  %inc18.i = add nuw nsw i32 %p13, 1
  %cmp = icmp slt i32 %inc18.i, 7
  br i1 %cmp, label %for.cond8, label %fn1.exit
}

attributes #4 = { "frame-pointer"="all" }

@x = external global i32, align 4
@y = external global i32, align 4

; The post-dominator tree does not include the branch containing the infinite
; loop, which can occur into a misplacement of the restore block, if we're
; looking for the nearest common post-dominator of an "unreachable" block.

define void @infiniteLoopNoSuccessor() #5 {
; ENABLE-LABEL: infiniteLoopNoSuccessor:
; ENABLE:       ## %bb.0:
; ENABLE-NEXT:    pushq %rbp
; ENABLE-NEXT:    movq %rsp, %rbp
; ENABLE-NEXT:    movq _x@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    cmpl $0, (%rax)
; ENABLE-NEXT:    je LBB17_2
; ENABLE-NEXT:  ## %bb.1:
; ENABLE-NEXT:    movl $0, (%rax)
; ENABLE-NEXT:  LBB17_2:
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    callq _somethingElse
; ENABLE-NEXT:    movq _y@GOTPCREL(%rip), %rax
; ENABLE-NEXT:    cmpl $0, (%rax)
; ENABLE-NEXT:    je LBB17_3
; ENABLE-NEXT:  ## %bb.5:
; ENABLE-NEXT:    popq %rbp
; ENABLE-NEXT:    retq
; ENABLE-NEXT:  LBB17_3:
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    callq _something
; ENABLE-NEXT:    .p2align 4, 0x90
; ENABLE-NEXT:  LBB17_4: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT:    xorl %eax, %eax
; ENABLE-NEXT:    callq _somethingElse
; ENABLE-NEXT:    jmp LBB17_4
;
; DISABLE-LABEL: infiniteLoopNoSuccessor:
; DISABLE:       ## %bb.0:
; DISABLE-NEXT:    pushq %rbp
; DISABLE-NEXT:    movq %rsp, %rbp
; DISABLE-NEXT:    movq _x@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    cmpl $0, (%rax)
; DISABLE-NEXT:    je LBB17_2
; DISABLE-NEXT:  ## %bb.1:
; DISABLE-NEXT:    movl $0, (%rax)
; DISABLE-NEXT:  LBB17_2:
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    callq _somethingElse
; DISABLE-NEXT:    movq _y@GOTPCREL(%rip), %rax
; DISABLE-NEXT:    cmpl $0, (%rax)
; DISABLE-NEXT:    je LBB17_3
; DISABLE-NEXT:  ## %bb.5:
; DISABLE-NEXT:    popq %rbp
; DISABLE-NEXT:    retq
; DISABLE-NEXT:  LBB17_3:
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    callq _something
; DISABLE-NEXT:    .p2align 4, 0x90
; DISABLE-NEXT:  LBB17_4: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT:    xorl %eax, %eax
; DISABLE-NEXT:    callq _somethingElse
; DISABLE-NEXT:    jmp LBB17_4
  %1 = load i32, ptr @x, align 4
  %2 = icmp ne i32 %1, 0
  br i1 %2, label %3, label %4

; <label>:3:
  store i32 0, ptr @x, align 4
  br label %4

; <label>:4:
  call void (...) @somethingElse()
  %5 = load i32, ptr @y, align 4
  %6 = icmp ne i32 %5, 0
  br i1 %6, label %10, label %7

; <label>:7:
  %8 = call i32 (...) @something()
  br label %9

; <label>:9:
  call void (...) @somethingElse()
  br label %9

; <label>:10:
  ret void
}

declare void @somethingElse(...)

attributes #5 = { nounwind "frame-pointer"="non-leaf" }