llvm/test/Transforms/SimplifyCFG/sink-and-convert-switch.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes='simplifycfg<sink-common-insts;switch-to-lookup>' < %s | FileCheck %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"

define void @pr104567(i8 %x, ptr %f) {
; CHECK-LABEL: define void @pr104567(
; CHECK-SAME: i8 [[X:%.*]], ptr [[F:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    [[Y:%.*]] = alloca [1 x i8], align 1
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(ptr nonnull [[Y]])
; CHECK-NEXT:    [[SWITCH_OFFSET:%.*]] = add nsw i8 [[X]], 4
; CHECK-NEXT:    store i8 [[SWITCH_OFFSET]], ptr [[Y]], align 1
; CHECK-NEXT:    call void [[F]](ptr [[Y]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(ptr nonnull [[Y]])
; CHECK-NEXT:    ret void
;
start:
  %y = alloca [1 x i8], align 1
  call void @llvm.lifetime.start.p0(ptr nonnull %y)
  switch i8 %x, label %default.unreachable [
  i8 0, label %bb4
  i8 1, label %bb3
  i8 2, label %bb2
  ]

default.unreachable:
  unreachable

bb4:
  store i8 4, ptr %y, align 1
  br label %bb5

bb3:
  store i8 5, ptr %y, align 1
  br label %bb5

bb2:
  store i8 6, ptr %y, align 1
  br label %bb5

bb5:
  call void %f(ptr %y)
  call void @llvm.lifetime.end.p0(ptr nonnull %y)
  ret void
}

define i64 @dont_make_div_variable(i64 noundef %x, i64 noundef %i) {
; CHECK-LABEL: define i64 @dont_make_div_variable(
; CHECK-SAME: i64 noundef [[X:%.*]], i64 noundef [[I:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    switch i64 [[I]], label %[[SW_DEFAULT:.*]] [
; CHECK-NEXT:      i64 9, label %[[SW_BB:.*]]
; CHECK-NEXT:      i64 10, label %[[SW_BB1:.*]]
; CHECK-NEXT:      i64 11, label %[[SW_BB3:.*]]
; CHECK-NEXT:      i64 12, label %[[SW_BB5:.*]]
; CHECK-NEXT:    ]
; CHECK:       [[SW_BB]]:
; CHECK-NEXT:    [[DIV:%.*]] = udiv i64 [[X]], 9
; CHECK-NEXT:    br label %[[RETURN:.*]]
; CHECK:       [[SW_BB1]]:
; CHECK-NEXT:    [[DIV2:%.*]] = udiv i64 [[X]], 10
; CHECK-NEXT:    br label %[[RETURN]]
; CHECK:       [[SW_BB3]]:
; CHECK-NEXT:    [[DIV4:%.*]] = udiv i64 [[X]], 11
; CHECK-NEXT:    br label %[[RETURN]]
; CHECK:       [[SW_BB5]]:
; CHECK-NEXT:    [[DIV7:%.*]] = udiv i64 [[X]], 12
; CHECK-NEXT:    br label %[[RETURN]]
; CHECK:       [[SW_DEFAULT]]:
; CHECK-NEXT:    unreachable
; CHECK:       [[RETURN]]:
; CHECK-NEXT:    [[DIV6:%.*]] = phi i64 [ [[DIV7]], %[[SW_BB5]] ], [ [[DIV4]], %[[SW_BB3]] ], [ [[DIV2]], %[[SW_BB1]] ], [ [[DIV]], %[[SW_BB]] ]
; CHECK-NEXT:    ret i64 [[DIV6]]
;
entry:
  switch i64 %i, label %sw.default [
  i64 9, label %sw.bb
  i64 10, label %sw.bb1
  i64 11, label %sw.bb3
  i64 12, label %sw.bb5
  ]

sw.bb:
  %div = udiv i64 %x, 9
  br label %return

sw.bb1:
  %div2 = udiv i64 %x, 10
  br label %return

sw.bb3:
  %div4 = udiv i64 %x, 11
  br label %return

sw.bb5:
  %div6 = udiv i64 %x, 12
  br label %return

sw.default:
  unreachable

return:
  %retval.0 = phi i64 [ %div6, %sw.bb5 ], [ %div4, %sw.bb3 ], [ %div2, %sw.bb1 ], [ %div, %sw.bb ]
  ret i64 %retval.0
}

define i64 @okay_to_make_div_variable(i64 noundef %x, i64 noundef %i) {
; CHECK-LABEL: define i64 @okay_to_make_div_variable(
; CHECK-SAME: i64 noundef [[X:%.*]], i64 noundef [[I:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[SWITCH_TABLEIDX:%.*]] = sub nsw i64 [[I]], 9
; CHECK-NEXT:    [[SWITCH_OFFSET:%.*]] = add nsw i64 [[SWITCH_TABLEIDX]], 9
; CHECK-NEXT:    [[DIV6:%.*]] = udiv i64 [[SWITCH_OFFSET]], [[X]]
; CHECK-NEXT:    ret i64 [[DIV6]]
;
entry:
  switch i64 %i, label %sw.default [
  i64 9, label %sw.bb
  i64 10, label %sw.bb1
  i64 11, label %sw.bb3
  i64 12, label %sw.bb5
  ]

sw.bb:
  %div = udiv i64 9, %x
  br label %return

sw.bb1:
  %div2 = udiv i64 10, %x
  br label %return

sw.bb3:
  %div4 = udiv i64 11, %x
  br label %return

sw.bb5:
  %div6 = udiv i64 12, %x
  br label %return

sw.default:
  unreachable

return:
  %retval.0 = phi i64 [ %div6, %sw.bb5 ], [ %div4, %sw.bb3 ], [ %div2, %sw.bb1 ], [ %div, %sw.bb ]
  ret i64 %retval.0
}