test/Transforms/SimplifyCFG/X86/sink-common-code-into-unreachable.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -sink-common-insts -S | FileCheck %s
; RUN: opt < %s -passes='simplifycfg<sink-common-insts>' -S | FileCheck %s

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-pc-linux-gnu"

; `unreachable` block has conditional predecessors,
; but everything we'd sink from unconditional predecessors are speculatable.
; Also, too many phi's would normally be needed.
define void @t0(i4 %cond,  i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h) {
; CHECK-LABEL: @t0(
; CHECK-NEXT:    switch i4 [[COND:%.*]], label [[END:%.*]] [
; CHECK-NEXT:      i4 0, label [[END_SINK_SPLIT:%.*]]
; CHECK-NEXT:      i4 -1, label [[END_SINK_SPLIT]]
; CHECK-NEXT:      i4 1, label [[BB1:%.*]]
; CHECK-NEXT:      i4 -2, label [[BB1]]
; CHECK-NEXT:    ]
; CHECK:       bb1:
; CHECK-NEXT:    br label [[END_SINK_SPLIT]]
; CHECK:       end.sink.split:
; CHECK-NEXT:    [[H_SINK:%.*]] = phi i32 [ [[H:%.*]], [[BB1]] ], [ [[E:%.*]], [[TMP0:%.*]] ], [ [[E]], [[TMP0]] ]
; CHECK-NEXT:    [[G_SINK:%.*]] = phi i32 [ [[G:%.*]], [[BB1]] ], [ [[D:%.*]], [[TMP0]] ], [ [[D]], [[TMP0]] ]
; CHECK-NEXT:    [[V4:%.*]] = add i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[V5:%.*]] = add i32 [[V4]], [[C:%.*]]
; CHECK-NEXT:    [[V6:%.*]] = add i32 [[G_SINK]], [[H_SINK]]
; CHECK-NEXT:    [[R7:%.*]] = add i32 [[V5]], [[V6]]
; CHECK-NEXT:    call void @use32(i32 [[R7]])
; CHECK-NEXT:    unreachable
; CHECK:       end:
; CHECK-NEXT:    unreachable
;
  switch i4 %cond, label %end [
  i4 0, label %bb0
  i4 -1, label %bb0
  i4  1, label %bb1
  i4 -2, label %bb1
  ]

bb0:
  %v0 = add i32 %a, %b
  %v1 = add i32 %v0, %c
  %v2 = add i32 %d, %e
  %r3 = add i32 %v1, %v2
  call void @use32(i32 %r3)
  br label %end

bb1:
  %v4 = add i32 %a, %b
  %v5 = add i32 %v4, %c
  %v6 = add i32 %g, %h
  %r7 = add i32 %v5, %v6
  call void @use32(i32 %r7)
  br label %end

end:
  unreachable
}

; Same, as @t0, but there's also a loop.
define void @t1(i4 %cond, i1 %cond.loop, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h) {
; CHECK-LABEL: @t1(
; CHECK-NEXT:    switch i4 [[COND:%.*]], label [[END_EARLY:%.*]] [
; CHECK-NEXT:      i4 0, label [[BB0:%.*]]
; CHECK-NEXT:      i4 -1, label [[BB0]]
; CHECK-NEXT:      i4 1, label [[BB1:%.*]]
; CHECK-NEXT:      i4 -2, label [[BB1]]
; CHECK-NEXT:    ]
; CHECK:       bb0:
; CHECK-NEXT:    [[V0:%.*]] = add i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[V1:%.*]] = add i32 [[V0]], [[C:%.*]]
; CHECK-NEXT:    [[V2:%.*]] = add i32 [[D:%.*]], [[E:%.*]]
; CHECK-NEXT:    [[R3:%.*]] = add i32 [[V1]], [[V2]]
; CHECK-NEXT:    call void @use32(i32 [[R3]])
; CHECK-NEXT:    br label [[END_EARLY]]
; CHECK:       bb1:
; CHECK-NEXT:    [[V4:%.*]] = add i32 [[A]], [[B]]
; CHECK-NEXT:    [[V5:%.*]] = add i32 [[V4]], [[C]]
; CHECK-NEXT:    [[V6:%.*]] = add i32 [[G:%.*]], [[H:%.*]]
; CHECK-NEXT:    [[R7:%.*]] = add i32 [[V5]], [[V6]]
; CHECK-NEXT:    call void @use32(i32 [[R7]])
; CHECK-NEXT:    br label [[END_EARLY]]
; CHECK:       end.early:
; CHECK-NEXT:    call void @sideeffect()
; CHECK-NEXT:    br i1 [[COND_LOOP:%.*]], label [[END_EARLY]], label [[END:%.*]]
; CHECK:       end:
; CHECK-NEXT:    call void @sideeffect()
; CHECK-NEXT:    unreachable
;
  switch i4 %cond, label %end.early [
  i4 0, label %bb0
  i4 -1, label %bb0
  i4  1, label %bb1
  i4 -2, label %bb1
  ]

bb0:
  %v0 = add i32 %a, %b
  %v1 = add i32 %v0, %c
  %v2 = add i32 %d, %e
  %r3 = add i32 %v1, %v2
  call void @use32(i32 %r3)
  br label %end.early

bb1:
  %v4 = add i32 %a, %b
  %v5 = add i32 %v4, %c
  %v6 = add i32 %g, %h
  %r7 = add i32 %v5, %v6
  call void @use32(i32 %r7)
  br label %end.early

end.early:
  call void @sideeffect()
  br i1 %cond.loop, label %end.early, label %end

end:
  call void @sideeffect()
  unreachable
}

declare void @use32(i32) speculatable

declare void @sideeffect()