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llvm/llvm/test/Transforms/SimplifyCFG/unprofitable-pr.ll 

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -simplifycfg-max-small-block-size=6 -S < %s | FileCheck %s
; RUN: opt -passes=simplifycfg -simplifycfg-max-small-block-size=6 -S < %s | FileCheck %s

target datalayout = "e-p:64:64-p5:32:32-A5"

declare void @llvm.assume(i1)
declare i1 @llvm.type.test(ptr, metadata) nounwind readnone

define void @test_01(i1 %c, ptr align 1 %ptr) local_unnamed_addr #0 {
; CHECK-LABEL: @test_01(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[TRUE2_CRITEDGE:%.*]], label [[FALSE1:%.*]]
; CHECK:       false1:
; CHECK-NEXT:    store volatile i64 1, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    [[PTRINT:%.*]] = ptrtoint ptr [[PTR]] to i64
; CHECK-NEXT:    [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 7
; CHECK-NEXT:    [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 3, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
; CHECK:       common.ret:
; CHECK-NEXT:    ret void
; CHECK:       true2.critedge:
; CHECK-NEXT:    [[PTRINT_C:%.*]] = ptrtoint ptr [[PTR]] to i64
; CHECK-NEXT:    [[MASKEDPTR_C:%.*]] = and i64 [[PTRINT_C]], 7
; CHECK-NEXT:    [[MASKCOND_C:%.*]] = icmp eq i64 [[MASKEDPTR_C]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND_C]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 2, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET]]
;
  br i1 %c, label %true1, label %false1

true1:                                            ; preds = %false1, %0
  %ptrint = ptrtoint ptr %ptr to i64
  %maskedptr = and i64 %ptrint, 7
  %maskcond = icmp eq i64 %maskedptr, 0
  tail call void @llvm.assume(i1 %maskcond)
  store volatile i64 0, ptr %ptr, align 8
  br i1 %c, label %true2, label %false2

false1:                                           ; preds = %0
  store volatile i64 1, ptr %ptr, align 4
  br label %true1

true2:                                            ; preds = %true1
  store volatile i64 2, ptr %ptr, align 8
  ret void

false2:                                           ; preds = %true1
  store volatile i64 3, ptr %ptr, align 8
  ret void
}

; Corner case: the block has max possible size for which we still do PRE.
define void @test_02(i1 %c, ptr align 1 %ptr) local_unnamed_addr #0 {
; CHECK-LABEL: @test_02(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[TRUE2_CRITEDGE:%.*]], label [[FALSE1:%.*]]
; CHECK:       false1:
; CHECK-NEXT:    store volatile i64 1, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    [[PTRINT:%.*]] = ptrtoint ptr [[PTR]] to i64
; CHECK-NEXT:    [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 7
; CHECK-NEXT:    [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 3, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
; CHECK:       common.ret:
; CHECK-NEXT:    ret void
; CHECK:       true2.critedge:
; CHECK-NEXT:    [[PTRINT_C:%.*]] = ptrtoint ptr [[PTR]] to i64
; CHECK-NEXT:    [[MASKEDPTR_C:%.*]] = and i64 [[PTRINT_C]], 7
; CHECK-NEXT:    [[MASKCOND_C:%.*]] = icmp eq i64 [[MASKEDPTR_C]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND_C]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 2, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET]]
;
  br i1 %c, label %true1, label %false1

true1:                                            ; preds = %false1, %0
  %ptrint = ptrtoint ptr %ptr to i64
  %maskedptr = and i64 %ptrint, 7
  %maskcond = icmp eq i64 %maskedptr, 0
  tail call void @llvm.assume(i1 %maskcond)
  store volatile i64 0, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  br i1 %c, label %true2, label %false2

false1:                                           ; preds = %0
  store volatile i64 1, ptr %ptr, align 4
  br label %true1

true2:                                            ; preds = %true1
  store volatile i64 2, ptr %ptr, align 8
  ret void

false2:                                           ; preds = %true1
  store volatile i64 3, ptr %ptr, align 8
  ret void
}

; This block is too huge for PRE.
define void @test_03(i1 %c, ptr align 1 %ptr) local_unnamed_addr #0 {
; CHECK-LABEL: @test_03(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[TRUE1:%.*]], label [[FALSE1:%.*]]
; CHECK:       true1:
; CHECK-NEXT:    [[PTRINT:%.*]] = ptrtoint ptr [[PTR:%.*]] to i64
; CHECK-NEXT:    [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 7
; CHECK-NEXT:    [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[MASKCOND]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    br i1 [[C]], label [[TRUE2:%.*]], label [[FALSE2:%.*]]
; CHECK:       false1:
; CHECK-NEXT:    store volatile i64 1, ptr [[PTR]], align 4
; CHECK-NEXT:    br label [[TRUE1]]
; CHECK:       common.ret:
; CHECK-NEXT:    ret void
; CHECK:       true2:
; CHECK-NEXT:    store volatile i64 2, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
; CHECK:       false2:
; CHECK-NEXT:    store volatile i64 3, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET]]
;
  br i1 %c, label %true1, label %false1

true1:                                            ; preds = %false1, %0
  %ptrint = ptrtoint ptr %ptr to i64
  %maskedptr = and i64 %ptrint, 7
  %maskcond = icmp eq i64 %maskedptr, 0
  tail call void @llvm.assume(i1 %maskcond)
  store volatile i64 0, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  br i1 %c, label %true2, label %false2

false1:                                           ; preds = %0
  store volatile i64 1, ptr %ptr, align 4
  br label %true1

true2:                                            ; preds = %true1
  store volatile i64 2, ptr %ptr, align 8
  ret void

false2:                                           ; preds = %true1
  store volatile i64 3, ptr %ptr, align 8
  ret void
}

; Try the max block size for PRE again but with the bitcast/type test/assume
; sequence used for whole program devirt.
define void @test_04(i1 %c, ptr align 1 %ptr, ptr %vtable) local_unnamed_addr #0 {
; CHECK-LABEL: @test_04(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[TRUE2_CRITEDGE:%.*]], label [[FALSE1:%.*]]
; CHECK:       false1:
; CHECK-NEXT:    store volatile i64 1, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    [[P:%.*]] = call i1 @llvm.type.test(ptr [[VTABLE:%.*]], metadata !"foo")
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[P]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 3, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
; CHECK:       common.ret:
; CHECK-NEXT:    ret void
; CHECK:       true2.critedge:
; CHECK-NEXT:    [[P_C:%.*]] = call i1 @llvm.type.test(ptr [[VTABLE]], metadata !"foo")
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[P_C]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 2, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET]]
;
  br i1 %c, label %true1, label %false1

true1:                                            ; preds = %false1, %0
  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"foo")
  tail call void @llvm.assume(i1 %p)
  store volatile i64 0, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  br i1 %c, label %true2, label %false2

false1:                                           ; preds = %0
  store volatile i64 1, ptr %ptr, align 4
  br label %true1

true2:                                            ; preds = %true1
  store volatile i64 2, ptr %ptr, align 8
  ret void

false2:                                           ; preds = %true1
  store volatile i64 3, ptr %ptr, align 8
  ret void
}

; The load, icmp and assume should not count towards the limit, they are
; ephemeral.
define void @test_non_speculatable(i1 %c, ptr align 1 %ptr, ptr %ptr2) local_unnamed_addr #0 {
; CHECK-LABEL: @test_non_speculatable(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[TRUE2_CRITEDGE:%.*]], label [[FALSE1:%.*]]
; CHECK:       false1:
; CHECK-NEXT:    store volatile i64 1, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    [[V:%.*]] = load i8, ptr [[PTR2:%.*]], align 1
; CHECK-NEXT:    [[C2:%.*]] = icmp eq i8 [[V]], 42
; CHECK-NEXT:    call void @llvm.assume(i1 [[C2]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 3, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
; CHECK:       common.ret:
; CHECK-NEXT:    ret void
; CHECK:       true2.critedge:
; CHECK-NEXT:    [[V_C:%.*]] = load i8, ptr [[PTR2]], align 1
; CHECK-NEXT:    [[C2_C:%.*]] = icmp eq i8 [[V_C]], 42
; CHECK-NEXT:    call void @llvm.assume(i1 [[C2_C]])
; CHECK-NEXT:    store volatile i64 0, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 -1, ptr [[PTR]], align 8
; CHECK-NEXT:    store volatile i64 2, ptr [[PTR]], align 8
; CHECK-NEXT:    br label [[COMMON_RET]]
;
  br i1 %c, label %true1, label %false1

true1:                                            ; preds = %false1, %0
  %v = load i8, ptr %ptr2
  %c2 = icmp eq i8 %v, 42
  call void @llvm.assume(i1 %c2)
  store volatile i64 0, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  store volatile i64 -1, ptr %ptr, align 8
  br i1 %c, label %true2, label %false2

false1:                                           ; preds = %0
  store volatile i64 1, ptr %ptr, align 4
  br label %true1

true2:                                            ; preds = %true1
  store volatile i64 2, ptr %ptr, align 8
  ret void

false2:                                           ; preds = %true1
  store volatile i64 3, ptr %ptr, align 8
  ret void
}