llvm/test/Transforms/SimplifyCFG/X86/switch-of-powers-of-two.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes='simplifycfg<switch-to-lookup>' -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s

target triple = "x86_64-unknown-linux-gnu"

define i32 @switch_of_powers_two(i32 %arg) {
; CHECK-LABEL: define i32 @switch_of_powers_two(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.cttz.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT:    [[TMP1:%.*]] = zext nneg i32 [[TMP0]] to i64
; CHECK-NEXT:    [[SWITCH_GEP:%.*]] = getelementptr inbounds [7 x i32], ptr @switch.table.switch_of_powers_two, i64 0, i64 [[TMP1]]
; CHECK-NEXT:    [[SWITCH_LOAD:%.*]] = load i32, ptr [[SWITCH_GEP]], align 4
; CHECK-NEXT:    ret i32 [[SWITCH_LOAD]]
;
entry:
  switch i32 %arg, label %default_case [
  i32 1,  label %bb1
  i32 8,  label %bb2
  i32 16, label %bb3
  i32 32, label %bb4
  i32 64, label %bb5
  ]


default_case: unreachable
bb1: br label %return
bb2: br label %return
bb3: br label %return
bb4: br label %return
bb5: br label %return

return:
  %phi = phi i32 [ 3, %bb1 ], [ 2, %bb2 ], [ 1, %bb3 ], [ 0, %bb4 ], [ 42, %bb5 ]
  ret i32 %phi
}